Julia v1.6 Release Notes ======================== New language features --------------------- * Types written with `where` syntax can now be used to define constructors, e.g. `(Foo{T} where T)(x) = ...`. * `<--` and `<-->` are now available as infix operators, with the same precedence and associativity as other arrow-like operators ([#36666]). * Compilation and type inference can now be enabled or disabled at the module level using the experimental macro `Base.Experimental.@compiler_options` ([#37041]). * The library name passed to `ccall` or `@ccall` can now be an expression involving global variables and function calls. The expression will be evaluated the first time the `ccall` executes ([#36458]). * `ꜛ` (U+A71B), `ꜜ` (U+A71C) and `ꜝ` (U+A71D) can now also be used as operator suffixes. They can be tab-completed from `\^uparrow`, `\^downarrow` and `\^!` in the REPL ([#37542]). * Standalone "dotted" operators now get parsed as `Expr(:., :op)`, which gets lowered to `Base.BroadcastFunction(op)`. This means `.op` is functionally equivalent to `(x...) -> (op).(x...)`, which can be useful for passing the broadcasted version of an operator to higher-order functions, for example `map(.*, A, B)` for an elementwise product of two arrays of arrays ([#37583]). * The syntax `import A as B` (plus `import A: x as y`, `import A.x as y`, and `using A: x as y`) can now be used to rename imported modules and identifiers ([#1255]). * Unsigned literals (starting with `0x`) which are too big to fit in a `UInt128` object are now interpreted as `BigInt` ([#23546]). * It is now possible to use `...` on the left-hand side of assignments for taking any number of items from the front of an iterable collection, while also collecting the rest, for example `a, b... = [1, 2, 3]`. This syntax is implemented using `Base.rest`, which can be overloaded to customize its behavior for different collection types ([#37410]). Language changes ---------------- * The postfix conjugate transpose operator `'` now accepts Unicode modifiers as suffixes, so e.g. `a'ᵀ` is parsed as `var"'ᵀ"(a)`, which can be defined by the user. `a'ᵀ` parsed as `a' * ᵀ` before, so this is a minor breaking change ([#37247]). * Macros that return `:quote` expressions (e.g. via `Expr(:quote, ...)`) were previously able to work without escaping (`esc(...)`) their output when needed. This has been corrected, and now `esc` must be used in these macros as it is in other macros ([#37540]). * The `-->` operator now lowers to a `:call` expression, so it can be defined as a function like other operators. The dotted version `.-->` is now parsed as well. For backwards compatibility, `-->` still parses using its own expression head instead of `:call`. * The `a[begin, k]` syntax now calls `firstindex(a, 1)` rather than `first(axes(a, 1))` ([#35779]), but the former now defaults to the latter for any `a` ([#38742]). * `⌿` (U+233F) and `¦` (U+00A6) are now infix operators with times-like and plus-like precedence, respectively. Previously they were parsed as identifier characters ([#37973]). Compiler/Runtime improvements ----------------------------- * All platforms can now use `@executable_path` within `jl_load_dynamic_library()`. This allows executable-relative paths to be embedded within executables on all platforms, not just MacOS, which the syntax is borrowed from ([#35627]). * Constant propagation now occurs through keyword arguments ([#35976]). * The precompilation cache is now created atomically ([#36416]). Invoking _n_ Julia processes simultaneously may create _n_ temporary caches. Command-line option changes --------------------------- * There is no longer a concept of "home project": starting `julia --project=dir` is now exactly equivalent to starting `julia` and then doing `pkg> activate $dir` and `julia --project` is exactly equivalent to doing that where `dir = Base.current_project()`. In particular, this means that if you do `pkg> activate` after starting `julia` with the `--project` option (or with `JULIA_PROJECT` set) it will take you to the default active project, which is `@v1.6` unless you have modified `LOAD_PATH` ([#36434]). Multi-threading changes ----------------------- * Locks now automatically inhibit finalizers from running, to avoid deadlock ([#38487]). * New function `Base.Threads.foreach(f, channel::Channel)` for multithreaded `Channel` consumption ([#34543]). Build system changes -------------------- * Windows Installer now has the option to 'Add Julia to Path'. To unselect this option from the commandline simply remove the tasks you do not want to be installed: e.g. `./julia-installer.exe /TASKS="desktopicon,startmenu,addtopath"`, adds a desktop icon, a startmenu group icon, and adds Julia to system PATH. New library functions --------------------- * New function `Base.kron!` and corresponding overloads for various matrix types for performing Kronecker product in-place ([#31069]). * New function `Base.readeach(io, T)` for iteratively performing `read(io, T)` ([#36150]). * `Iterators.map` is added. It provides another syntax `Iterators.map(f, iterators...)` for writing `(f(args...) for args in zip(iterators...))`, i.e. a lazy `map` ([#34352]). * New function `sincospi` for simultaneously computing `sinpi(x)` and `cospi(x)` more efficiently ([#35816]). * New function `cispi(x)` for more accurately computing `cis(pi * x)` ([#38449]). * New function `addenv` for adding environment mappings into a `Cmd` object, returning the new `Cmd` object. * New function `insorted` for determining whether an element is in a sorted collection or not ([#37490]). * New function `Base.rest` for taking the rest of a collection, starting from a specific iteration state, in a generic way ([#37410]). New library features -------------------- * The `redirect_*` functions now accept `devnull` to discard all output redirected to it, and as an empty input ([#36146]). * The `redirect_*` functions can now be called on `IOContext` objects ([#36688]). * `findfirst`, `findnext`, `findlast`, and `findall` now support `AbstractVector{<:Union{Int8,UInt8}}` (pattern, array) arguments ([#37283]). * New constructor `NamedTuple(iterator)` that constructs a named tuple from a key-value pair iterator. * A new `reinterpret(reshape, T, a::AbstractArray{S})` reinterprets `a` to have eltype `T` while potentially inserting or consuming the first dimension depending on the ratio of `sizeof(T)` and `sizeof(S)`. * New `append!(vector, collections...)` and `prepend!(vector, collections...)` methods accept multiple collections to be appended or prepended ([#36227]). * The postfix operator `'ᵀ` can now be used as an alias for `transpose` ([#38062]). * `keys(io::IO)` has been added, which returns all keys of `io` if `io` is an `IOContext` and an empty `Base.KeySet` otherwise ([#37753]). * `count` now accepts an optional `init` argument to control the accumulation type ([#37461]). * New method `occursin(haystack)` that returns a function that checks whether its argument occurs in `haystack` ([#38475]). * New methods `∉(collection)`, `∋(item)`, and `∌(item)` returning corresponding containment-testing functions ([#38475]). * The `nextprod` function now accepts tuples and other array types for its first argument ([#35791]). * The `reverse(A; dims)` function for multidimensional `A` can now reverse multiple dimensions at once by passing a tuple for `dims`, and defaults to reversing all dimensions; there is also a multidimensional in-place `reverse!(A; dims)` ([#37367]). * The function `isapprox(x,y)` now accepts the `norm` keyword argument also for numeric (i.e., non-array) arguments `x` and `y` ([#35883]). * `ispow2(x)` now supports non-`Integer` arguments `x` ([#37635]). * `view`, `@view`, and `@views` now work on `AbstractString`s, returning a `SubString` when appropriate ([#35879]). * All `AbstractUnitRange{<:Integer}`s now work with `SubString`, `view`, `@view` and `@views` on strings ([#35879]). * `sum`, `prod`, `maximum`, and `minimum` now support `init` keyword argument ([#36188], [#35839]). * `unique(f, itr; seen=Set{T}())` now allows you to declare the container type used for keeping track of values returned by `f` on elements of `itr` ([#36280]). * `first` and `last` functions now accept an integer as second argument to get that many leading or trailing elements of any iterable ([#34868]). * `CartesianIndices` now supports step different from `1`. It can also be constructed from three `CartesianIndex`es `I`, `S`, `J` using `I:S:J`. `step` for `CartesianIndices` now returns a `CartesianIndex` ([#37829]). * `RegexMatch` objects can now be probed for whether a named capture group exists within it through `haskey()` ([#36717]). * For consistency `haskey(r::RegexMatch, i::Integer)` has also been added and returns if the capture group for `i` exists ([#37300]). Standard library changes ------------------------ * A new standard library `TOML` has been added for parsing and printing [TOML files](https://toml.io) ([#37034]). * A new standard library `Downloads` has been added, which replaces the old `Base.download` function with `Downloads.download`, providing cross-platform, multi-protocol, in-process download functionality implemented with [libcurl](https://curl.haxx.se/libcurl/) ([#37340]). * `Libdl` has been moved to `Base.Libc.Libdl`, however it is still accessible as an stdlib ([#35628]). * To download artifacts lazily, `LazyArtifacts` now must be explicitly listed as a dependency, to avoid needing the support machinery to be available when it is not commonly needed ([#37844]). * It is no longer possible to create a `LinRange`, `StepRange`, or `StepRangeLen` with a `<: Integer` eltype but non-integer step ([#32439]). * `intersect` on `CartesianIndices` now returns `CartesianIndices` instead of `Vector{<:CartesianIndex}` ([#36643]). * `push!(c::Channel, v)` now returns channel `c`. Previously, it returned the pushed value `v` ([#34202]). * The composition operator `∘` now returns a `Base.ComposedFunction` instead of an anonymous function ([#37517]). * Logging (such as `@warn`) no longer catches exceptions in the logger itself ([#36600]). * `@time` now reports if the time presented included any compilation time, which is shown as a percentage ([#37678]). * `@varinfo` can now report non-exported objects within modules, look recursively into submodules, and return a sorted results table ([#38042]). * `@testset` now supports the option `verbose` to show the test result summary of the children even if they all pass ([#33755]). #### Package Manager * `pkg> precompile` is now parallelized through depth-first precompilation of dependencies. Errors will only throw for direct dependencies listed in the `Project.toml`. * `pkg> precompile` is now automatically triggered whenever Pkg changes the active manifest. Auto-precompilation will remember if a package has errored within the given environment and will not retry until it changes. Auto-precompilation can be gracefully interrupted with a `ctrl-c` and disabled by setting the environment variable `JULIA_PKG_PRECOMPILE_AUTO=0`. * The `Pkg.BinaryPlatforms` module has been moved into `Base` as `Base.BinaryPlatforms` and heavily reworked. Applications that want to be compatible with the old API should continue to import `Pkg.BinaryPlatforms`, however new users should use `Base.BinaryPlatforms` directly ([#37320]). * The `Pkg.Artifacts` module has been imported as a separate standard library. It is still available as `Pkg.Artifacts`, however starting from Julia v1.6+, packages may import simply `Artifacts` without importing all of `Pkg` alongside ([#37320]). #### LinearAlgebra * New method `LinearAlgebra.issuccess(::CholeskyPivoted)` for checking whether pivoted Cholesky factorization was successful ([#36002]). * `UniformScaling` can now be indexed into using ranges to return dense matrices and vectors ([#24359]). * New function `LinearAlgebra.BLAS.get_num_threads()` for getting the number of BLAS threads ([#36360]). * `(+)(::UniformScaling)` is now defined, making `+I` a valid unary operation ([#36784]). * Instances of `UniformScaling` are no longer `isequal` to matrices. Previous behaviour violated the rule that `isequal(x, y)` implies `hash(x) == hash(y)`. * Transposing `*Triangular` matrices now returns matrices of the opposite triangular type, consistently with `adjoint!(::*Triangular)` and `transpose!(::*Triangular)`. Packages containing methods with, e.g., `Adjoint{<:Any,<:LowerTriangular{<:Any,<:OwnMatrixType}}` should replace that by `UpperTriangular{<:Any,<:Adjoint{<:Any,<:OwnMatrixType}}` in the method signature ([#38168]). #### Markdown #### Printf * Complete overhaul of internal code to use the ryu float printing algorithms (from Julia 1.4); leads to consistent 2-5x performance improvements. * New `Printf.tofloat` function allowing custom float types to more easily integrate with Printf formatting by converting their type to `Float16`, `Float32`, `Float64`, or `BigFloat`. * New `Printf.format"..."` and `Printf.Format(...)` functions that allow creating `Printf.Format` objects that can be passed to `Printf.format` for easier dynamic printf formatting. * `Printf.format(f::Printf.Format, args...)` as a non-macro function that applies a printf format `f` to provided `args`. #### Random #### REPL * The `AbstractMenu` extension interface of `REPL.TerminalMenus` has been extensively overhauled. The new interface does not rely on global configuration variables, is more consistent in delegating printing of the navigation/selection markers, and provides improved support for dynamic menus. These changes are compatible with the previous (deprecated) interface, so are non-breaking. The new API offers several enhancements: + Menus are configured in their constructors via keyword arguments. + For custom menu types, the new `Config` and `MultiSelectConfig` replace the global `CONFIG` `Dict`. + `request(menu; cursor=1)` allows you to control the initial cursor position in the menu (defaults to first item). + `MultiSelectMenu` allows you to pass a list of initially-selected items with the `selected` keyword argument. + `writeLine` was deprecated to `writeline`, and `writeline` methods are not expected to print the cursor indicator. The old `writeLine` continues to work, and any of its method extensions should print the cursor indicator as before. + `printMenu` has been deprecated to `printmenu`, and it both accepts a state input and returns a state output that controls the number of terminal lines erased when the menu is next refreshed. This plus related changes makes `printmenu` work properly when the number of menu items might change depending on user choices. + `numoptions`, returning the number of items in the menu, has been added as an alternative to implementing `options`. + `suppress_output` (primarily a testing option) has been added as a keyword argument to `request`, rather than a configuration option. * Tab completion now supports runs of consecutive sub/superscript characters, e.g. `\^(3)` tab-completes to `⁽³⁾` ([#38649]). * Windows REPL now supports 24-bit colors, by correctly interpreting virtual terminal escapes. #### SparseArrays * Display large sparse matrices with a Unicode "spy" plot of their nonzero patterns, and display small sparse matrices by an `Matrix`-like 2d layout of their contents ([#33821]). * New convenient `spdiagm([m, n,] v::AbstractVector)` methods which call `spdiagm([m, n,] 0 => v)`, consistently with their dense `diagm` counterparts ([#37684]). #### Dates * `Quarter` period is defined ([#35519]). * `canonicalize` can now take `Period` as an input ([#37391]). * Zero-valued `FixedPeriod`s and `OtherPeriod`s now compare equal, e.g., `Year(0) == Day(0)`. The behavior of non-zero `Period`s is not changed ([#37486]). #### Statistics #### Sockets #### Distributed * Now supports invoking Windows workers via ssh (via new keyword argument `shell=:wincmd` in `addprocs`) ([#30614]). * Other new keyword arguments in `addprocs`: `ssh` to specify the ssh client path, `env` to pass environment variables to workers, and `cmdline_cookie` to work around an ssh problem with Windows workers that run older (pre-ConPTY) versions of Windows, Julia or OpenSSH ([#30614]). #### UUIDs * Change `uuid1` and `uuid4` to use `Random.RandomDevice()` as default random number generator ([#35872]). * Added `parse(::Type{UUID}, ::AbstractString)` method. #### Mmap * On Unix systems, the `Mmap.madvise!` function (along with OS-specific `Mmap.MADV_*` constants) has been added to give advice on handling of memory-mapped arrays ([#37369]). Deprecated or removed --------------------- * The `Base.download` function has been deprecated (silently, by default) in favor of the new `Downloads.download` standard library function ([#37340]). * The `Base.Grisu` code has been officially removed (float printing was switched to the ryu algorithm code in 1.4). The code is available from [JuliaAttic](https://github.com/JuliaAttic/Grisu.jl) if needed. External dependencies --------------------- Tooling Improvements --------------------- [#1255]: https://github.com/JuliaLang/julia/issues/1255 [#23546]: https://github.com/JuliaLang/julia/issues/23546 [#24359]: https://github.com/JuliaLang/julia/issues/24359 [#30614]: https://github.com/JuliaLang/julia/issues/30614 [#31069]: https://github.com/JuliaLang/julia/issues/31069 [#32439]: https://github.com/JuliaLang/julia/issues/32439 [#33755]: https://github.com/JuliaLang/julia/issues/33755 [#33821]: https://github.com/JuliaLang/julia/issues/33821 [#34202]: https://github.com/JuliaLang/julia/issues/34202 [#34352]: https://github.com/JuliaLang/julia/issues/34352 [#34543]: https://github.com/JuliaLang/julia/issues/34543 [#34868]: https://github.com/JuliaLang/julia/issues/34868 [#35519]: https://github.com/JuliaLang/julia/issues/35519 [#35627]: https://github.com/JuliaLang/julia/issues/35627 [#35628]: https://github.com/JuliaLang/julia/issues/35628 [#35779]: https://github.com/JuliaLang/julia/issues/35779 [#35791]: https://github.com/JuliaLang/julia/issues/35791 [#35816]: https://github.com/JuliaLang/julia/issues/35816 [#35839]: https://github.com/JuliaLang/julia/issues/35839 [#35872]: https://github.com/JuliaLang/julia/issues/35872 [#35879]: https://github.com/JuliaLang/julia/issues/35879 [#35883]: https://github.com/JuliaLang/julia/issues/35883 [#35976]: https://github.com/JuliaLang/julia/issues/35976 [#36002]: https://github.com/JuliaLang/julia/issues/36002 [#36146]: https://github.com/JuliaLang/julia/issues/36146 [#36150]: https://github.com/JuliaLang/julia/issues/36150 [#36188]: https://github.com/JuliaLang/julia/issues/36188 [#36227]: https://github.com/JuliaLang/julia/issues/36227 [#36280]: https://github.com/JuliaLang/julia/issues/36280 [#36360]: https://github.com/JuliaLang/julia/issues/36360 [#36416]: https://github.com/JuliaLang/julia/issues/36416 [#36434]: https://github.com/JuliaLang/julia/issues/36434 [#36458]: https://github.com/JuliaLang/julia/issues/36458 [#36600]: https://github.com/JuliaLang/julia/issues/36600 [#36643]: https://github.com/JuliaLang/julia/issues/36643 [#36666]: https://github.com/JuliaLang/julia/issues/36666 [#36688]: https://github.com/JuliaLang/julia/issues/36688 [#36717]: https://github.com/JuliaLang/julia/issues/36717 [#36784]: https://github.com/JuliaLang/julia/issues/36784 [#37034]: https://github.com/JuliaLang/julia/issues/37034 [#37041]: https://github.com/JuliaLang/julia/issues/37041 [#37247]: https://github.com/JuliaLang/julia/issues/37247 [#37283]: https://github.com/JuliaLang/julia/issues/37283 [#37300]: https://github.com/JuliaLang/julia/issues/37300 [#37320]: https://github.com/JuliaLang/julia/issues/37320 [#37340]: https://github.com/JuliaLang/julia/issues/37340 [#37367]: https://github.com/JuliaLang/julia/issues/37367 [#37369]: https://github.com/JuliaLang/julia/issues/37369 [#37391]: https://github.com/JuliaLang/julia/issues/37391 [#37410]: https://github.com/JuliaLang/julia/issues/37410 [#37461]: https://github.com/JuliaLang/julia/issues/37461 [#37486]: https://github.com/JuliaLang/julia/issues/37486 [#37490]: https://github.com/JuliaLang/julia/issues/37490 [#37517]: https://github.com/JuliaLang/julia/issues/37517 [#37540]: https://github.com/JuliaLang/julia/issues/37540 [#37542]: https://github.com/JuliaLang/julia/issues/37542 [#37583]: https://github.com/JuliaLang/julia/issues/37583 [#37635]: https://github.com/JuliaLang/julia/issues/37635 [#37678]: https://github.com/JuliaLang/julia/issues/37678 [#37684]: https://github.com/JuliaLang/julia/issues/37684 [#37753]: https://github.com/JuliaLang/julia/issues/37753 [#37829]: https://github.com/JuliaLang/julia/issues/37829 [#37844]: https://github.com/JuliaLang/julia/issues/37844 [#37973]: https://github.com/JuliaLang/julia/issues/37973 [#38042]: https://github.com/JuliaLang/julia/issues/38042 [#38062]: https://github.com/JuliaLang/julia/issues/38062 [#38168]: https://github.com/JuliaLang/julia/issues/38168 [#38449]: https://github.com/JuliaLang/julia/issues/38449 [#38475]: https://github.com/JuliaLang/julia/issues/38475 [#38487]: https://github.com/JuliaLang/julia/issues/38487 [#38649]: https://github.com/JuliaLang/julia/issues/38649 [#38742]: https://github.com/JuliaLang/julia/issues/38742 Julia v1.5 Release Notes ======================== New language features --------------------- * Macro calls `@foo {...}` can now also be written `@foo{...}` (without the space) ([#34498]). * `⨟` is now parsed as a binary operator with times precedence. It can be entered in the REPL with `\bbsemi` followed by TAB ([#34722]). * `±` and `∓` are now unary operators as well, like `+` or `-`. Attention has to be paid in macros and matrix constructors, which are whitespace sensitive, because expressions like `[a ±b]` now get parsed as `[a ±(b)]` instead of `[±(a, b)]` ([#34200]). * Passing an identifier `x` by itself as a keyword argument or named tuple element is equivalent to `x=x`, implicitly using the name of the variable as the keyword or named tuple field name. Similarly, passing an `a.b` expression uses `b` as the keyword or field name ([#29333]). * Support for Unicode 13.0.0 (via utf8proc 2.5) ([#35282]). * The compiler optimization level can now be set per-module using the experimental macro `Base.Experimental.@optlevel n`. For code that is not performance-critical, setting this to 0 or 1 can provide significant latency improvements ([#34896]). Language changes ---------------- * The interactive REPL now uses "soft scope" for top-level expressions: an assignment inside a scope block such as a `for` loop automatically assigns to a global variable if one has been defined already. This matches the behavior of Julia versions 0.6 and prior, as well as [IJulia](https://github.com/JuliaLang/IJulia.jl). Note that this only affects expressions interactively typed or pasted directly into the default REPL ([#28789], [#33864]). * Outside of the REPL (e.g. in a file), assigning to a variable within a top-level scope block is considered ambiguous if a global variable with the same name exists. A warning is given if that happens, to alert you that the code will work differently than in the REPL. A new command line option `--warn-scope` controls this warning ([#33864]). * Converting arbitrary tuples to `NTuple`, e.g. `convert(NTuple, (1, ""))` now gives an error, where it used to be incorrectly allowed. This is because `NTuple` refers only to homogeneous tuples (this meaning has not changed) ([#34272]). * The syntax `(;)` (which was deprecated in v1.4) now creates an empty named tuple ([#30115]). * `@inline` macro can now be applied to short-form anonymous functions ([#34953]). * In triple-quoted string literals, whitespace stripping is now done before processing escape sequences instead of after. For example, the syntax ``` """ a\n b""" ``` used to yield the string " a\nb", since the single space before `b` set the indent level. Now the result is "a\n b", since the space before `b` is no longer considered to occur at the start of a line. The old behavior is considered a bug ([#35001]). * `<:` and `>:` can now be broadcasted over arrays with `.<:` and `.>:` ([#35085]) * The line number of function definitions is now added by the parser as an additional `LineNumberNode` at the start of each function body ([#35138]). * Statements of the form `a'` now get lowered to `var"'"(a)` instead of `Base.adjoint(a)`. This allows for shadowing this function in local scopes, although this is generally discouraged. By default, Base exports `var"'"` as an alias of `Base.adjoint`, so custom types should still extend `Base.adjoint` ([#34634]). Compiler/Runtime improvements ----------------------------- * Immutable structs (including tuples) that contain references can now be allocated on the stack, and allocated inline within arrays and other structs ([#33886]). This significantly reduces the number of heap allocations in some workloads. Code that requires assumptions about object layout and addresses (usually for interoperability with C or other languages) might need to be updated; for example any object that needs a stable address should be a `mutable struct`. As a result, Array `view`s no longer allocate ([#34126]). Command-line option changes --------------------------- * Deprecation warnings are no longer shown by default. i.e. if the `--depwarn=...` flag is not passed it defaults to `--depwarn=no`. The warnings are printed from tests run by `Pkg.test()` ([#35362]). * Color now defaults to on when stdout and stderr are TTYs ([#34347]). * `-t N`, `--threads N` starts Julia with `N` threads. This option takes precedence over `JULIA_NUM_THREADS`. The specified number of threads also propagates to worker processes spawned using the `-p`/`--procs` or `--machine-file` command line arguments. In order to set number of threads for worker processes spawned with `addprocs` use the `exeflags` keyword argument, e.g. ```addprocs(...; exeflags=`--threads 4`)``` ([#35108]). Multi-threading changes ----------------------- * Parts of the multi-threading API are now considered stable, with caveats. This includes all documented identifiers from `Base.Threads` except the `atomic_` operations. * `@threads` now allows an optional schedule argument. Use `@threads :static ...` to ensure that the same schedule will be used as in past versions; the default schedule is likely to change in the future. Build system changes -------------------- * The build system now contains a pure-make caching system for expanding expensive operations at the latest possible moment, while still expanding it only once ([#35626]). New library functions --------------------- * Packages can now provide custom hints to help users resolve errors by using the experimental `Base.Experimental.register_error_hint` function. Packages that define custom exception types can support hints by calling the `Base.Experimental.show_error_hints` from their `showerror` method ([#35094]). * The `@ccall` macro has been added to Base. It is a near drop-in replacement for `ccall` with more Julia-like syntax. It also wraps the new `foreigncall` API for varargs of different types, though it lacks the capability to specify an LLVM calling convention ([#32748]). * New functions `mergewith` and `mergewith!` supersede `merge` and `merge!` with `combine` argument. They don't have the restriction for `combine` to be a `Function` and also provide one-argument method that returns a closure. The old methods of `merge` and `merge!` are still available for backward compatibility ([#34296]). * The new `isdisjoint` function indicates whether two collections are disjoint ([#34427]). * Add function `ismutable` and deprecate `isimmutable` to check whether something is mutable ([#34652]). * `include` now accepts an optional `mapexpr` first argument to transform the parsed expressions before they are evaluated ([#34595]). * New function `bitreverse` for reversing the order of bits in a fixed-width integer ([#34791]). * New function `bitrotate(x, k)` for rotating the bits in a fixed-width integer ([#33937]). * New function `contains(haystack, needle)` and its one argument partially applied form have been added, it acts like `occursin(needle, haystack)` ([#35132]). * New function `Base.exit_on_sigint` is added to control if `InterruptException` is thrown by Ctrl-C ([#29411]). New library features -------------------- * Function composition now works also on one argument `∘(f) = f` (#34251). * One argument methods `startswith(x)` and `endswith(x)` have been added, returning partially-applied versions of the functions, similar to existing methods like `isequal(x)` ([#33193]). * `isapprox` (or `≈`) now has a one-argument "curried" method `isapprox(x)` which returns a function, like `isequal` (or `==`) ([#32305]). * `@NamedTuple{key1::Type1, ...}` macro for convenient `NamedTuple` declarations ([#34548]). * `Ref{NTuple{N,T}}` can be passed to `Ptr{T}`/`Ref{T}` `ccall` signatures ([#34199]). * `x::Signed % Unsigned` and `x::Unsigned % Signed` are supported for integer bitstypes. * `signed(unsigned_type)` is supported for integer bitstypes, `unsigned(signed_type)` has been supported. * `accumulate`, `cumsum`, and `cumprod` now support `Tuple` ([#34654]) and arbitrary iterators ([#34656]). * `pop!(collection, key, [default])` now has a method for `Vector` to remove an element at an arbitrary index ([#35513]). * In `splice!` with no replacement, values to be removed can now be specified with an arbitrary iterable (instead of a `UnitRange`) ([#34524]). * The `@view` and `@views` macros now support the `a[begin]` syntax that was introduced in Julia 1.4 ([#35289]). * `open` for files now accepts a keyword argument `lock` controlling whether file operations will acquire locks for safe multi-threaded access. Setting it to `false` provides better performance when only one thread will access the file ([#35426]). * The introspection macros (`@which`, `@code_typed`, etc.) now work with `do`-block syntax ([#35283]) and with dot syntax ([#35522]). * `count` now accepts the `dims` keyword. * new in-place `count!` function similar to `sum!`. * `peek` is now exported and accepts a type to peek from a stream ([#28811]). Standard library changes ------------------------ * Empty ranges now compare equal, regardless of their startpoint and step ([#32348]). * A 1-d `Zip` iterator (where `Base.IteratorSize` is `Base.HasShape{1}()`) with defined length of `n` has now also size of `(n,)` (instead of throwing an error with truncated iterators) ([#29927]). * The `@timed` macro now returns a `NamedTuple` ([#34149]). * New `supertypes(T)` function returns a tuple of all supertypes of `T` ([#34419]). * Views of builtin ranges are now recomputed ranges (like indexing returns) instead of `SubArray`s ([#26872]). * Sorting-related functions such as `sort` that take the keyword arguments `lt`, `rev`, `order` and `by` now do not discard `order` if `by` or `lt` are passed. In the former case, the order from `order` is used to compare the values of `by(element)`. In the latter case, any order different from `Forward` or `Reverse` will raise an error about the ambiguity. * `close` on a file (`IOStream`) can now throw an exception if an error occurs when trying to flush buffered data to disk ([#35303]). * The large `StridedArray` `Union` now has special printing to avoid printing out its entire contents ([#31149]). #### LinearAlgebra * The BLAS submodule now supports the level-2 BLAS subroutine `hpmv!` ([#34211]). * `normalize` now supports multidimensional arrays ([#34239]). * `lq` factorizations can now be used to compute the minimum-norm solution to under-determined systems ([#34350]). * `sqrt(::Hermitian)` now treats slightly negative eigenvalues as zero for nearly semidefinite matrices, and accepts a new `rtol` keyword argument for this tolerance ([#35057]). * The BLAS submodule now supports the level-2 BLAS subroutine `spmv!` ([#34320]). * The BLAS submodule now supports the level-1 BLAS subroutine `rot!` ([#35124]). * New generic `rotate!(x, y, c, s)` and `reflect!(x, y, c, s)` functions ([#35124]). #### Markdown * In docstrings, a level-1 markdown header "Extended help" is now interpreted as a marker dividing "brief help" from "extended help". The REPL help mode only shows the brief help (the content before the "Extended help" header) by default; prepend the expression with '?' (in addition to the one that enters the help mode) to see the full docstring ([#25930]). #### Random * `randn!(::MersenneTwister, ::Array{Float64})` is faster, and as a result, for a given state of the RNG, the corresponding generated numbers have changed ([#35078]). * `rand!(::MersenneTwister, ::Array{Bool})` is faster, and as a result, for a given state of the RNG, the corresponding generated numbers have changed ([#33721]). * A new faster algorithm ("nearly division less") is used for generating random numbers within a range ([#29240]). As a result, the streams of generated numbers are changed (for ranges, like in `rand(1:9)`, and for collections in general, like in `rand([1, 2, 3])`). Also, for performance, the undocumented property that, given a seed and `a, b` of type `Int`, `rand(a:b)` produces the same stream on 32 and 64 bits architectures, is dropped. #### REPL #### SparseArrays * `lu!` accepts `UmfpackLU` as an argument to make use of its symbolic factorization. * The `trim` keyword argument for the functions `fkeep!`, `tril!`, `triu!`, `droptol!`,`dropzeros!` and `dropzeros` has been removed in favour of always trimming. Calling these with `trim=false` could result in invalid sparse arrays. #### Dates * The `eps` function now accepts `TimeType` types ([#31487]). * The `zero` function now accepts `TimeType` types ([#35554]). #### Statistics #### Sockets * Joining and leaving UDP multicast groups on a `UDPSocket` is now supported through `join_multicast_group()` and `leave_multicast_group()` ([#35521]). #### Distributed * `launch_on_machine` now supports and parses ipv6 square-bracket notation ([#34430]). Deprecated or removed --------------------- External dependencies --------------------- * OpenBLAS has been updated to v0.3.9 ([#35113]). Tooling Improvements --------------------- [#25930]: https://github.com/JuliaLang/julia/issues/25930 [#26872]: https://github.com/JuliaLang/julia/issues/26872 [#28789]: https://github.com/JuliaLang/julia/issues/28789 [#29240]: https://github.com/JuliaLang/julia/issues/29240 [#29333]: https://github.com/JuliaLang/julia/issues/29333 [#29411]: https://github.com/JuliaLang/julia/issues/29411 [#29927]: https://github.com/JuliaLang/julia/issues/29927 [#30115]: https://github.com/JuliaLang/julia/issues/30115 [#31149]: https://github.com/JuliaLang/julia/issues/31149 [#31487]: https://github.com/JuliaLang/julia/issues/31487 [#32305]: https://github.com/JuliaLang/julia/issues/32305 [#32348]: https://github.com/JuliaLang/julia/issues/32348 [#32748]: https://github.com/JuliaLang/julia/issues/32748 [#33193]: https://github.com/JuliaLang/julia/issues/33193 [#33721]: https://github.com/JuliaLang/julia/issues/33721 [#33864]: https://github.com/JuliaLang/julia/issues/33864 [#33886]: https://github.com/JuliaLang/julia/issues/33886 [#33937]: https://github.com/JuliaLang/julia/issues/33937 [#34149]: https://github.com/JuliaLang/julia/issues/34149 [#34199]: https://github.com/JuliaLang/julia/issues/34199 [#34200]: https://github.com/JuliaLang/julia/issues/34200 [#34211]: https://github.com/JuliaLang/julia/issues/34211 [#34239]: https://github.com/JuliaLang/julia/issues/34239 [#34272]: https://github.com/JuliaLang/julia/issues/34272 [#34296]: https://github.com/JuliaLang/julia/issues/34296 [#34320]: https://github.com/JuliaLang/julia/issues/34320 [#34347]: https://github.com/JuliaLang/julia/issues/34347 [#34350]: https://github.com/JuliaLang/julia/issues/34350 [#34419]: https://github.com/JuliaLang/julia/issues/34419 [#34427]: https://github.com/JuliaLang/julia/issues/34427 [#34430]: https://github.com/JuliaLang/julia/issues/34430 [#34498]: https://github.com/JuliaLang/julia/issues/34498 [#34524]: https://github.com/JuliaLang/julia/issues/34524 [#34548]: https://github.com/JuliaLang/julia/issues/34548 [#34595]: https://github.com/JuliaLang/julia/issues/34595 [#34634]: https://github.com/JuliaLang/julia/issues/34634 [#34652]: https://github.com/JuliaLang/julia/issues/34652 [#34654]: https://github.com/JuliaLang/julia/issues/34654 [#34656]: https://github.com/JuliaLang/julia/issues/34656 [#34722]: https://github.com/JuliaLang/julia/issues/34722 [#34791]: https://github.com/JuliaLang/julia/issues/34791 [#34896]: https://github.com/JuliaLang/julia/issues/34896 [#34953]: https://github.com/JuliaLang/julia/issues/34953 [#35001]: https://github.com/JuliaLang/julia/issues/35001 [#35078]: https://github.com/JuliaLang/julia/issues/35078 [#35094]: https://github.com/JuliaLang/julia/issues/35094 [#35108]: https://github.com/JuliaLang/julia/issues/35108 [#35124]: https://github.com/JuliaLang/julia/issues/35124 [#35132]: https://github.com/JuliaLang/julia/issues/35132 [#35138]: https://github.com/JuliaLang/julia/issues/35138 [#35282]: https://github.com/JuliaLang/julia/issues/35282 [#35283]: https://github.com/JuliaLang/julia/issues/35283 [#35289]: https://github.com/JuliaLang/julia/issues/35289 [#35303]: https://github.com/JuliaLang/julia/issues/35303 [#35362]: https://github.com/JuliaLang/julia/issues/35362 [#35426]: https://github.com/JuliaLang/julia/issues/35426 [#35513]: https://github.com/JuliaLang/julia/issues/35513 [#35521]: https://github.com/JuliaLang/julia/issues/35521 [#35522]: https://github.com/JuliaLang/julia/issues/35522 [#35554]: https://github.com/JuliaLang/julia/issues/35554 [#35626]: https://github.com/JuliaLang/julia/issues/35626 Julia v1.4 Release Notes ======================== New language features --------------------- * Structs with all isbits and isbitsunion fields are now stored inline in arrays ([#32448]). * `import` now allows quoted symbols, e.g. `import Base.:+` ([#33158]). * `a[begin]` can now be used to address the first element of an integer-indexed collection `a`. The index is computed by `firstindex(a)` ([#33946]). Language changes ---------------- * The syntax `(;)`, which used to parse as an empty block expression, is deprecated. In the future it will indicate an empty named tuple ([#30115]). Multi-threading changes ----------------------- * Values can now be interpolated into `@async` and `@spawn` via `$`, which copies the value directly into the constructed underlying closure ([#33119]). Build system changes -------------------- * Windows build installer has switched to Inno Setup. Installer command line parameters have thus changed. For example, to extract the installer to a specific directory, the command line parameter is now `/DIR=x:\dirname`. Use `julia-installer.exe /?` to list all new command line parameters. New library functions --------------------- * The new `only(x)` function returns the one-and-only element of a collection `x`, and throws an `ArgumentError` if `x` contains zero or multiple elements ([#33129]). * `takewhile` and `dropwhile` have been added to the Iterators submodule ([#33437]). * `accumulate` has been added to the Iterators submodule ([#34033]). * There is a now an `evalpoly` function meant to take the role of the `@evalpoly` macro. The function is just as efficient as the macro while giving added flexibility, so it should be preferred over `@evalpoly`. `evalpoly` takes a list of coefficients as a tuple, so where one might write `@evalpoly(x, p1, p2, p3)` one would instead write `evalpoly(x, (p1, p2, p3))`. New library features -------------------- * Function composition now supports multiple functions: `∘(f, g, h) = f ∘ g ∘ h` and splatting `∘(fs...)` for composing an iterable collection of functions ([#33568]). * Functions `gcd`, `lcm`, and `gcdx` now support `Rational` arguments ([#33910]). * The `splitpath` function now accepts any `AbstractString` whereas previously it only accepted paths of type `String` ([#33012]). * `filter` can now act on a `Tuple` ([#32968]). * The `tempname` function now takes an optional `parent::AbstractString` argument to give it a directory in which to attempt to produce a temporary path name ([#33090]). * The `tempname` function now takes a `cleanup::Bool` keyword argument defaulting to `true`, which causes the process to try to ensure that any file or directory at the path returned by `tempname` is deleted upon process exit ([#33090]). * The `readdir` function now takes a `join::Bool` keyword argument defaulting to `false`, which when set causes `readdir` to join its directory argument with each listed name ([#33113]). * `div` now accepts a rounding mode as the third argument, consistent with the corresponding argument to `rem`. Support for rounding division, by passing one of the RoundNearest modes to this function, was added. For future compatibility, library authors should now extend this function, rather than extending the two-argument `fld`/`cld`/`div` directly ([#33040]). * `methods` now accepts a module (or a list thereof) to filter methods defined in it ([#33403]). Standard library changes ------------------------ * Calling `show` or `repr` on an `undef`/`UndefInitializer()` array initializer now shows valid Julia code ([#33211]). * Calling `show` or `repr` on a 0-dimensional `AbstractArray` now shows valid code for creating an equivalent 0-dimensional array, instead of only showing the contained value ([#33206]). * `readdir` output is now guaranteed to be sorted. The `sort` keyword allows opting out of sorting to get names in OS-native order ([#33542]). * The methods of `mktemp` and `mktempdir` that take a function to pass temporary paths to no longer throw errors if the path is already deleted when the function returns ([#33091]). * Verbose `display` of `Char` (`text/plain` output) now shows the codepoint value in standard-conforming `"U+XXXX"` format ([#33291]). * `Iterators.partition` now uses views (or smartly re-computed ranges) for partitions of all `AbstractArray`s ([#33533]). * Sets are now displayed less compactly in the REPL, as a column of elements, like vectors and dictionaries ([#33300]). * `delete!` on `WeakKeyDict`s now returns the `WeakKeyDict` itself instead of the underlying `Dict` used for implementation #### LinearAlgebra * `qr` and `qr!` functions support `blocksize` keyword argument ([#33053]). * `dot` now admits a 3-argument method `dot(x, A, y)` to compute generalized dot products `dot(x, A*y)`, but without computing and storing the intermediate result `A*y` ([#32739]). * `ldlt` and non-pivoted `lu` now throw a new `ZeroPivotException` type ([#33372]). * `cond(A, p)` with `p=1` or `p=Inf` now computes the exact condition number instead of an estimate ([#33547]). * `UniformScaling` objects may now be exponentiated such that `(a*I)^x = a^x * I`. #### Markdown * Tables now have the `align` attribute set when `show`n as HTML ([#33849]). #### Random * `AbstractRNG`s now behave like scalars when used in broadcasting ([#33213]). * The performance of `rand(::Tuple)` is improved in some cases ([#32208]). As a consequence, the stream of generated values produced for a given seed has changed. #### REPL * The attributes of the implicit `IOContext` used by the REPL to display objects can be modified by the user (experimental feature) ([#29249]). #### SparseArrays * The return value of `zero(x::AbstractSparseArray)` has no stored zeros anymore ([#31835]). Previously, it would have stored zeros wherever `x` had them. This makes the operation constant time instead of `O()`. * Products involving sparse arrays now allow more general sparse `eltype`s, such as `StaticArrays` ([#33205]) [#29249]: https://github.com/JuliaLang/julia/issues/29249 [#30115]: https://github.com/JuliaLang/julia/issues/30115 [#31835]: https://github.com/JuliaLang/julia/issues/31835 [#32208]: https://github.com/JuliaLang/julia/issues/32208 [#32448]: https://github.com/JuliaLang/julia/issues/32448 [#32739]: https://github.com/JuliaLang/julia/issues/32739 [#32968]: https://github.com/JuliaLang/julia/issues/32968 [#33012]: https://github.com/JuliaLang/julia/issues/33012 [#33040]: https://github.com/JuliaLang/julia/issues/33040 [#33053]: https://github.com/JuliaLang/julia/issues/33053 [#33090]: https://github.com/JuliaLang/julia/issues/33090 [#33091]: https://github.com/JuliaLang/julia/issues/33091 [#33113]: https://github.com/JuliaLang/julia/issues/33113 [#33119]: https://github.com/JuliaLang/julia/issues/33119 [#33129]: https://github.com/JuliaLang/julia/issues/33129 [#33158]: https://github.com/JuliaLang/julia/issues/33158 [#33205]: https://github.com/JuliaLang/julia/issues/33205 [#33206]: https://github.com/JuliaLang/julia/issues/33206 [#33211]: https://github.com/JuliaLang/julia/issues/33211 [#33213]: https://github.com/JuliaLang/julia/issues/33213 [#33291]: https://github.com/JuliaLang/julia/issues/33291 [#33300]: https://github.com/JuliaLang/julia/issues/33300 [#33372]: https://github.com/JuliaLang/julia/issues/33372 [#33403]: https://github.com/JuliaLang/julia/issues/33403 [#33437]: https://github.com/JuliaLang/julia/issues/33437 [#33533]: https://github.com/JuliaLang/julia/issues/33533 [#33542]: https://github.com/JuliaLang/julia/issues/33542 [#33547]: https://github.com/JuliaLang/julia/issues/33547 [#33568]: https://github.com/JuliaLang/julia/issues/33568 [#33849]: https://github.com/JuliaLang/julia/issues/33849 [#33910]: https://github.com/JuliaLang/julia/issues/33910 [#33946]: https://github.com/JuliaLang/julia/issues/33946 [#34033]: https://github.com/JuliaLang/julia/issues/34033 Julia v1.3 Release Notes ======================== New language features --------------------- * Support for Unicode 12.1.0 ([#32002]). * Methods can now be added to an abstract type ([#31916]). * Support for unicode bold digits and double-struck digits 0 through 9 as valid identifiers ([#32838]). * Added the syntax `var"#str#"` for printing and parsing non-standard variable names ([#32408]). Language changes ---------------- Multi-threading changes ----------------------- * New experimental `Threads.@spawn` macro that runs a task on any available thread ([#32600]). * All system-level I/O operations (e.g. files and sockets) are now thread-safe. This does not include subtypes of `IO` that are entirely in-memory, such as `IOBuffer`, although it specifically does include `BufferStream`. ([#32309], [#32174], [#31981], [#32421]). * The global random number generator (`GLOBAL_RNG`) is now thread-safe (and thread-local) ([#32407]). * New `Channel(f::Function, spawn=true)` keyword argument to schedule the created Task on any available thread, matching the behavior of `Threads.@spawn` ([#32872]). * Simplified the `Channel` constructor, which is now easier to read and more idiomatic julia. Use of the keyword arguments `csize` and `ctype` is now discouraged ([#30855], [#32818]). Build system changes -------------------- New library functions --------------------- * `findfirst`, `findlast`, `findnext` and `findprev` now accept a character as first argument to search for that character in a string passed as the second argument ([#31664]). * New `findall(pattern, string)` method where `pattern` is a string or regex ([#31834]). * `count(pattern, string)` gives the number of things `findall` would match ([#32849]). * `istaskfailed` is now documented and exported, like its siblings `istaskdone` and `istaskstarted` ([#32300]). * `RefArray` and `RefValue` objects now accept index `CartesianIndex()` in `getindex` and `setindex!` ([#32653]) * Added `sincosd(x)` to simultaneously compute the sine and cosine of `x`, where `x` is in degrees ([#30134]). * The function `nonmissingtype`, which removes `Missing` from type unions, is now exported ([#31562]). Standard library changes ------------------------ * `Pkg` won't clobber pre-compilation files as often when switching environments ([#32651]) * `Pkg` can now download and install binary artifacts through the `Pkg.Artifacts` submodule and supporting functions. ([#32918]) * When `wait` (or `@sync`, or `fetch`) is called on a failing `Task`, the exception is propagated as a `TaskFailedException` wrapping the task. This makes it possible to see the location of the original failure inside the task (as well as the location of the `wait` call, as before) ([#32814]). * `Regex` can now be multiplied (`*`) and exponentiated (`^`), like strings ([#23422]). * `Cmd` interpolation (``` `$(x::Cmd) a b c` ``` where) now propagates `x`'s process flags (environment, flags, working directory, etc) if `x` is the first interpolant and errors otherwise ([#24353]). * Zero-dimensional arrays are now consistently preserved in the return values of mathematical functions that operate on the array(s) as a whole (and are not explicitly broadcasted across their elements). Previously, the functions `+`, `-`, `*`, `/`, `conj`, `real` and `imag` returned the unwrapped element when operating over zero-dimensional arrays ([#32122]). * `IPAddr` subtypes now behave like scalars when used in broadcasting ([#32133]). * `Pair` is now treated as a scalar for broadcasting ([#32209]). * `clamp` can now handle missing values ([#31066]). * `empty` now accepts a `NamedTuple` ([#32534]). * `mod` now accepts a unit range as the second argument to easily perform offset modular arithmetic to ensure the result is inside the range ([#32628]). * `nothing` can now be `print`ed, and interpolated into strings etc. as the string `"nothing"`. It is still not permitted to be interpolated into Cmds (i.e. ``echo `$(nothing)` `` will still error without running anything.) ([#32148]) * When `open` is called with a function, command, and keyword argument (e.g. ```open(`ls`, read=true) do f ...```) it now correctly throws a `ProcessFailedException` like other similar calls ([#32193]). * `mktemp` and `mktempdir` now try, by default, to remove temporary paths they create before the process exits ([#32851]). * Added argument `keep` to `unescape_string` ([#27125]). #### Libdl * `dlopen()` can now be invoked in `do`-block syntax, similar to `open()`. #### LinearAlgebra * The BLAS submodule no longer exports `dot`, which conflicts with that in LinearAlgebra ([#31838]). * `diagm` and `spdiagm` now accept optional `m,n` initial arguments to specify a size ([#31654]). * `Hessenberg` factorizations `H` now support efficient shifted solves `(H+µI) \ b` and determinants, and use a specialized tridiagonal factorization for Hermitian matrices. There is also a new `UpperHessenberg` matrix type ([#31853]). * Added keyword argument `alg` to `svd` and `svd!` that allows one to switch between different SVD algorithms ([#31057]). * Five-argument `mul!(C, A, B, α, β)` now implements inplace multiplication fused with addition _C = A B α + C β_ ([#23919]). #### SparseArrays * `SparseMatrixCSC(m,n,colptr,rowval,nzval)` perform consistency checks for arguments: `colptr` must be properly populated and lengths of `colptr`, `rowval`, and `nzval` must be compatible with `m`, `n`, and `eltype(colptr)`. * `sparse(I, J, V, m, n)` verifies lengths of `I`, `J`, `V` are equal and compatible with `eltype(I)` and `m`, `n`. #### Dates * `DateTime` and `Time` formatting/parsing now supports 12-hour clocks with AM/PM via `I` and `p` codes, similar to `strftime` ([#32308]). * Fixed `repr` such that it displays `Time` as it would be entered in Julia ([#32103]). #### Statistics * `mean` now accepts both a function argument and a `dims` keyword ([#31576]). #### Sockets * `Sockets.recvfrom` now returns both host and port as an InetAddr ([#32729]). * Added `InetAddr` constructor from `AbstractString`, representing IP address, and `Integer`, representing port number ([#31459]). #### Miscellaneous * `foldr` and `mapfoldr` now work on any iterator that supports `Iterators.reverse`, not just arrays ([#31781]). Deprecated or removed --------------------- * `@spawn expr` from the `Distributed` standard library should be replaced with `@spawnat :any expr` ([#32600]). * `Threads.Mutex` and `Threads.RecursiveSpinLock` have been removed; use `ReentrantLock` (preferred) or `Threads.SpinLock` instead ([#32875]). External dependencies --------------------- Tooling Improvements --------------------- * The `ClangSA.jl` static analysis package has been imported, which makes use of the clang static analyzer to validate GC invariants in Julia's C code. The analysis may be run using `make -C src analyzegc`. [#23422]: https://github.com/JuliaLang/julia/issues/23422 [#23919]: https://github.com/JuliaLang/julia/issues/23919 [#24353]: https://github.com/JuliaLang/julia/issues/24353 [#27125]: https://github.com/JuliaLang/julia/issues/27125 [#30134]: https://github.com/JuliaLang/julia/issues/30134 [#30855]: https://github.com/JuliaLang/julia/issues/30855 [#31057]: https://github.com/JuliaLang/julia/issues/31057 [#31066]: https://github.com/JuliaLang/julia/issues/31066 [#31459]: https://github.com/JuliaLang/julia/issues/31459 [#31562]: https://github.com/JuliaLang/julia/issues/31562 [#31576]: https://github.com/JuliaLang/julia/issues/31576 [#31654]: https://github.com/JuliaLang/julia/issues/31654 [#31664]: https://github.com/JuliaLang/julia/issues/31664 [#31781]: https://github.com/JuliaLang/julia/issues/31781 [#31834]: https://github.com/JuliaLang/julia/issues/31834 [#31838]: https://github.com/JuliaLang/julia/issues/31838 [#31853]: https://github.com/JuliaLang/julia/issues/31853 [#31916]: https://github.com/JuliaLang/julia/issues/31916 [#31981]: https://github.com/JuliaLang/julia/issues/31981 [#32002]: https://github.com/JuliaLang/julia/issues/32002 [#32103]: https://github.com/JuliaLang/julia/issues/32103 [#32122]: https://github.com/JuliaLang/julia/issues/32122 [#32133]: https://github.com/JuliaLang/julia/issues/32133 [#32148]: https://github.com/JuliaLang/julia/issues/32148 [#32174]: https://github.com/JuliaLang/julia/issues/32174 [#32193]: https://github.com/JuliaLang/julia/issues/32193 [#32209]: https://github.com/JuliaLang/julia/issues/32209 [#32300]: https://github.com/JuliaLang/julia/issues/32300 [#32308]: https://github.com/JuliaLang/julia/issues/32308 [#32309]: https://github.com/JuliaLang/julia/issues/32309 [#32407]: https://github.com/JuliaLang/julia/issues/32407 [#32408]: https://github.com/JuliaLang/julia/issues/32408 [#32421]: https://github.com/JuliaLang/julia/issues/32421 [#32534]: https://github.com/JuliaLang/julia/issues/32534 [#32600]: https://github.com/JuliaLang/julia/issues/32600 [#32628]: https://github.com/JuliaLang/julia/issues/32628 [#32653]: https://github.com/JuliaLang/julia/issues/32653 [#32729]: https://github.com/JuliaLang/julia/issues/32729 [#32814]: https://github.com/JuliaLang/julia/issues/32814 [#32818]: https://github.com/JuliaLang/julia/issues/32818 [#32838]: https://github.com/JuliaLang/julia/issues/32838 [#32849]: https://github.com/JuliaLang/julia/issues/32849 [#32851]: https://github.com/JuliaLang/julia/issues/32851 [#32872]: https://github.com/JuliaLang/julia/issues/32872 [#32875]: https://github.com/JuliaLang/julia/issues/32875 Julia v1.2 Release Notes ======================== New language features --------------------- * Argument splatting (`x...`) can now be used in calls to the `new` pseudo-function in constructors ([#30577]). * Support for Unicode 12.0.0 ([#31561]). * Added `⋆` (`\star`) as unary operator ([#31604]). Language changes ---------------- * Empty entries in `JULIA_DEPOT_PATH` are now expanded to default depot entries ([#31009]). Multi-threading changes ----------------------- * The `Condition` type now has a thread-safe replacement, accessed as `Threads.Condition`. With that addition, task scheduling primitives such as `ReentrantLock` are now thread-safe ([#30061]). * It is possible to schedule and switch Tasks during `@threads` loops, and perform limited I/O ([#31438]). Build system changes -------------------- * The build system now prefers downloading prebuilt binary tarballs for most dependencies on supported systems, disable by setting `USE_BINARYBUILDER=0` at `make` time ([#31441]). New library functions --------------------- * `getipaddrs()` function returns all the IP addresses of the local machine, with IPv4 addresses sorting before IPv6 addresses ([#30349, #30604]). * `getipaddr(addr_type)` and `getipaddrs(addr_type)` functions returns an IP address(es) of the desired type of the local machine ([#30604]). * Added `Base.hasproperty` and `Base.hasfield` ([#28850]). * One argument `!=(x)`, `>(x)`, `>=(x)`, `<(x)`, `<=(x)` have been added, returning partially-applied versions of the functions, similar to the existing `==(x)` and `isequal(x)` methods ([#30915]). * The new `map!(f, values(::AbstractDict))` method allows to modify in-place values of a dictionary ([#31223]). Standard library changes ------------------------ * `Enum` now behaves like a scalar when used in broadcasting ([#30670]). * If a `pipeline` is specified with `append=true` set, but no redirection, an `ArgumentError` is thrown, rather than a `ErrorException` ([#27900]). * Functions that invoke commands (e.g. `run(::Cmd)`) now throw a `ProcessFailedException` rather than an `ErrorException`, if those commands exit with non-zero exit code ([#27900]). * The `extrema` function now accepts a function argument in the same manner as `minimum` and `maximum` ([#30323]). * `hasmethod` can now check for matching keyword argument names ([#30712]). * `startswith` and `endswith` now accept a `Regex` for the second argument ([#29790]). * `retry` supports arbitrary callable objects ([#30382]). * A no-argument constructor for `Ptr{T}` has been added which constructs a null pointer ([#30919]). * `strip` now accepts a function argument in the same manner as `lstrip` and `rstrip` ([#31211]). * `mktempdir` now accepts a `prefix` keyword argument to customize the file name ([#31230], [#22922]). * `keytype` and `valtype` now work on `AbstractArray`, and return the `eltype` of `keys(...)` and `values(...)` respectively ([#27749]). * `nextfloat(::BigFloat)` and `prevfloat(::BigFloat)` now returns a value with the same precision as their argument, which means that (in particular) `nextfloat(prevfloat(x)) == x` whereas previously this could result in a completely different value with a different precision ([#31310]). * `mapreduce` now accepts multiple iterators, similar to `map` ([#31532]). * `filter` now supports `SkipMissing`-wrapped arrays ([#31235]). * Objects created by calling `skipmissing` on an array can now be indexed using indices from the parent at non-missing positions. This allows functions such as `findall`, `findfirst`, `argmin`/`argmax` and `findmin`/`findmax` to work with these objects, returning the index of matching non-missing elements in the parent ([#31008]). * `inv(::Missing)` has now been added and returns `missing` ([#31451]). * `nextfloat(::BigFloat, n::Integer)` and `prevfloat(::BigFloat, n::Integer)` methods have been added ([#31310]). #### LinearAlgebra * Added keyword arguments `rtol`, `atol` to `pinv` and `nullspace` ([#29998]). * `UniformScaling` instances are now callable such that e.g. `I(3)` will produce a `Diagonal` matrix ([#30298]). * Eigenvalues λ of general matrices are now sorted lexicographically by (Re λ, Im λ) ([#21598]). * `one` for structured matrices (`Diagonal`, `Bidiagonal`, `Tridiagonal`, `Symtridiagonal`) now preserves structure and type ([#29777]). * `diagm(v)` is now a shorthand for `diagm(0 => v)` ([#31125]). #### SparseArrays * Performance improvements for sparse matrix-matrix multiplication ([#30372]). * Sparse vector outer products are more performant and maintain sparsity in products of the form `kron(u, v')`, `u * v'`, and `u .* v'` where `u` and `v` are sparse vectors or column views ([#24980]). * The `sprand` function is now 2 to 5 times faster ([#30494]). As a consequence of this change, the random stream of matrices produced with `sprand` and `sprandn` has changed. #### Sockets * `getipaddrs` returns IP addresses in the order provided by libuv ([#32260]). * `getipaddr` prefers to return the first `IPv4` interface address provided by libuv ([#32260]). #### Dates * Fixed `repr` such that it displays `DateTime` as it would be entered in Julia ([#30200]). #### Statistics * `quantile` now accepts in all cases collections whose `eltype` is not a subtype of `Number` ([#30938]). #### Miscellaneous * Since environment variables on Windows are case-insensitive, `ENV` now converts its keys to uppercase for display, iteration, and copying ([#30593]). External dependencies --------------------- * libgit2 has been updated to v0.27.7 ([#30584]). * OpenBLAS has been updated to v0.3.5 ([#30583]). * MbedTLS has been updated to v2.16.0 ([#30618]). * libunwind has been updated to v1.3.1 ([#30724]). [#21598]: https://github.com/JuliaLang/julia/issues/21598 [#22922]: https://github.com/JuliaLang/julia/issues/22922 [#24980]: https://github.com/JuliaLang/julia/issues/24980 [#27749]: https://github.com/JuliaLang/julia/issues/27749 [#27900]: https://github.com/JuliaLang/julia/issues/27900 [#28850]: https://github.com/JuliaLang/julia/issues/28850 [#29777]: https://github.com/JuliaLang/julia/issues/29777 [#29790]: https://github.com/JuliaLang/julia/issues/29790 [#29998]: https://github.com/JuliaLang/julia/issues/29998 [#30061]: https://github.com/JuliaLang/julia/issues/30061 [#30200]: https://github.com/JuliaLang/julia/issues/30200 [#30298]: https://github.com/JuliaLang/julia/issues/30298 [#30323]: https://github.com/JuliaLang/julia/issues/30323 [#30372]: https://github.com/JuliaLang/julia/issues/30372 [#30382]: https://github.com/JuliaLang/julia/issues/30382 [#30494]: https://github.com/JuliaLang/julia/issues/30494 [#30577]: https://github.com/JuliaLang/julia/issues/30577 [#30583]: https://github.com/JuliaLang/julia/issues/30583 [#30584]: https://github.com/JuliaLang/julia/issues/30584 [#30593]: https://github.com/JuliaLang/julia/issues/30593 [#30604]: https://github.com/JuliaLang/julia/issues/30604 [#30618]: https://github.com/JuliaLang/julia/issues/30618 [#30670]: https://github.com/JuliaLang/julia/issues/30670 [#30712]: https://github.com/JuliaLang/julia/issues/30712 [#30724]: https://github.com/JuliaLang/julia/issues/30724 [#30915]: https://github.com/JuliaLang/julia/issues/30915 [#30919]: https://github.com/JuliaLang/julia/issues/30919 [#30938]: https://github.com/JuliaLang/julia/issues/30938 [#31008]: https://github.com/JuliaLang/julia/issues/31008 [#31009]: https://github.com/JuliaLang/julia/issues/31009 [#31125]: https://github.com/JuliaLang/julia/issues/31125 [#31211]: https://github.com/JuliaLang/julia/issues/31211 [#31230]: https://github.com/JuliaLang/julia/issues/31230 [#31235]: https://github.com/JuliaLang/julia/issues/31235 [#31310]: https://github.com/JuliaLang/julia/issues/31310 [#31438]: https://github.com/JuliaLang/julia/issues/31438 [#31441]: https://github.com/JuliaLang/julia/issues/31441 [#31451]: https://github.com/JuliaLang/julia/issues/31451 [#31532]: https://github.com/JuliaLang/julia/issues/31532 [#31561]: https://github.com/JuliaLang/julia/issues/31561 [#31604]: https://github.com/JuliaLang/julia/issues/31604 [#32260]: https://github.com/JuliaLang/julia/issues/32260 Julia v1.1 Release Notes ======================== New language features --------------------- * An *exception stack* is maintained on each task to make exception handling more robust and enable root cause analysis. The stack may be accessed using the experimental function `Base.catch_stack` ([#28878]). * The experimental macro `Base.@locals` returns a dictionary of current local variable names and values ([#29733]). * Binary `~` can now be dotted, as in `x .~ y` ([#30341]). Language changes ---------------- * Parser inputs ending with a comma are now consistently treated as incomplete. Previously they were sometimes parsed as tuples, depending on whitespace ([#28506]). * Spaces were accidentally allowed in broadcast call syntax, e.g. `f. (x)`. They are now disallowed, consistent with normal function call syntax ([#29781]). * Big integer literals and command syntax (backticks) are now parsed with the name of the macro (`@int128_str`, `@uint128_str`, `@big_str`, `@cmd`) qualified to refer to the `Core` module ([#29968]). * Using the same name for both a local variable and a static parameter is now an error instead of a warning ([#29429]). * `findall(in(b), a)` now returns a `CartesianIndex` when `a` is a matrix or a higher-dimensional array, for consistency with other `findall` methods. Use `LinearIndices(a)[findall(in(b), a)]` to get the old behavior, or `CartesianIndices(a)[findall(in(b), a)]` to get the new behavior on previous Julia versions ([#30226]). * `findmin(::BitArray)` and `findmax(::BitArray)` now return a `CartesianIndex` when `a` is a matrix or a higher-dimensional array, for consistency with other array types. Use `LinearIndices(a)[findmin(a)[2]]` to get the old behavior, or `CartesianIndices(a)[findmin(a)[2]]` to get the new behavior on previous Julia versions ([#30102]). * Method signatures such as `f(::Type{T}, ::T) where {T <: X}` and `f(::Type{X}, ::Any)` are now considered ambiguous. Previously a bug caused the first one to be considered more specific in some cases ([#30160]). Command-line option changes --------------------------- * When a script run in interactive mode (`-i`) throws an error, the REPL now starts after the error is displayed. Previously the REPL only started if the script completed without error ([#21233]). New library functions --------------------- * `splitpath(p::String)` function, which is the opposite of `joinpath(parts...)`: it splits a filepath into its components ([#28156]). * `isnothing(::Any)` predicate, to check whether the argument is `nothing`. ([#29679]). * `getpid(::Process)` method ([#24064]). * `eachrow`, `eachcol` and `eachslice` functions provide efficient iterators over slices of arrays ([#29749]). * `fieldtypes(T::Type)` which returns the declared types of the field in type T ([#29600]). * `uuid5` has been added to the `UUIDs` standard library ([#28761]). * Predicates `Sys.isfreebsd`, `Sys.isopenbsd`, `Sys.isnetbsd`, and `Sys.isdragonfly` for detecting BSD systems have been added ([#30249]). * Internal `Base.disable_library_threading` that sets libraries to use one thread. It executes function hooks that have been registered with `Base.at_disable_library_threading` ([#30004]). Standard library changes ------------------------ * `CartesianIndices` can now be constructed from two `CartesianIndex`es `I` and `J` with `I:J` ([#29440]). * `CartesianIndices` support broadcasting arithmetic (+ and -) with a `CartesianIndex` ([#29890]). * `copy!` support for arrays, dicts, and sets has been moved to Base from the Future package ([#29173]). * Channels now convert inserted values (like containers) instead of requiring types to match ([#29092]). * `range` can accept the stop value as a positional argument, e.g. `range(1,10,step=2)` ([#28708]). * `diff` now supports arrays of arbitrary dimensionality and can operate over any dimension ([#29827]). * The constructor `BigFloat(::BigFloat)` now respects the global precision setting and always returns a `BigFloat` with precision equal to `precision(BigFloat)` ([#29127]). The optional `precision` argument to override the global setting is now a keyword instead of positional argument ([#29157]). * The use of scientific notation when printing `BigFloat` values is now consistent with other floating point types ([#29211]). * `Regex` now behaves like a scalar when used in broadcasting ([#29913]). * `Char` now behaves like a read-only 0-dimensional array ([#29819]). * `parse` now allows strings representing integer 0 and 1 for type `Bool` ([#29980]). * `Base.tail` now works on named tuples ([#29595]). * The process id is appended to malloc log files in order to track memory allocations of multiple processes ([#29969]). * `Base.julia_cmd` now propagates the `--inline=(yes|no)` flag ([#29858]). * `Base.@kwdef` can now be used for parametric structs, and for structs with supertypes ([#29316]). * `merge(::NamedTuple, ::NamedTuple...)` can now be used with more than 2 `NamedTuple`s ([#29259]). * New `ncodeunits(c::Char)` method as a fast equivalent to `ncodeunits(string(c))` ([#29153]). * New `sort!(::AbstractArray; dims)` method that can sort the array along the `dims` dimension ([#28902]). * `range` now accepts `stop` as a positional argument ([#28708]). * `get(A::AbstractArray, (), default)` now returns `A[]` instead of an empty array ([#30270]). * `parse(Bool, str)` is now supported ([#29997]). * `copyto!(::AbstractMatrix, ::UniformScaling)` now supports rectangular matrices ([#28790]). * `current_project()` now searches the parent directories of a Git repository for a `Project.toml` file. This also affects the behavior of the `--project` command line option when using the default `--project=@.` ([#29108]). * The `spawn` API is now more flexible and supports taking IOBuffer directly as an I/O stream, converting to a system pipe as needed ([#30278]). #### Dates * New `DateTime(::Date, ::Time)` constructor ([#29754]). * `TimeZone` now behaves like a scalar when used in broadcasting ([#30159]). #### InteractiveUtils * `edit` can now be called on a module to edit the file that defines it ([#29636]). * All compiler-reflection tools (i.e. the `code_` class of functions and macros) now print accurate line number and inlining information in a common style, and take an optional parameter (debuginfo=:default) to control the verbosity of the metadata shown ([#29893]). #### LinearAlgebra * `isdiag` and `isposdef` for `Diagonal` and `UniformScaling` ([#29638]). * `mul!`, `rmul!` and `lmul!` methods for `UniformScaling` ([#29506]). * `Symmetric` and `Hermitian` matrices now preserve the wrapper when scaled with a number ([#29469]). * Exponentiation operator `^` now supports raising an `Irrational` to an `AbstractMatrix` power ([#29782]). * Added keyword arguments `rtol`, `atol` to `rank` ([#29926]). #### Random * `randperm` and `randcycle` now use the type of their argument to determine the element type of the returned array ([#29670]). * A new method `rand(::Tuple)` implements sampling from the values of a tuple ([#25278]). * `serialize` and `deserialize` now accept a filename argument, like `write` and `read` ([#30151]). #### SparseArrays * `sprandn` now supports specifying the output element type ([#30083]). #### Statistics * `mean` and `var` now handle more kinds of empty inputs ([#29033]). External dependencies --------------------- * 7zip (bundled with Julia on Windows) has been upgraded from version 16.04 to 18.05 ([#30035]). * Busybox is no longer bundled with Julia on Windows ([#30022]). * OpenBLAS has been upgraded from 0.3.2 to 0.3.3 ([#29845]). * The source code for Pkg is no longer included in JuliaLang/julia. Pkg is instead downloaded during the build process ([#29615]). * LLVM has been upgraded to 6.0.1 and support for LLVM < 6.0 has been dropped ([#28745], [#28696]). * Pkg has been upgraded to version 1.1 ([#30342]). Deprecated or removed --------------------- * `one(i::CartesianIndex)` should be replaced with `oneunit(i::CartesianIndex)` ([#29442]). * The internal array `Base.Grisu.DIGITS` is deprecated; new code should use `Base.Grisu.getbuf()` to get an appropriate task-local buffer and pass it to `grisu()` instead ([#29907]). * The internal function `Base._default_type(T)` has been removed. Calls to it should be replaced with just the argument `T` ([#29739]). * `peakflops` has been scheduled to move from `InteractiveUtils` to `LinearAlgebra` but is already now available as `LinearAlgebra.peakflops` ([#29978]). [#21233]: https://github.com/JuliaLang/julia/issues/21233 [#24064]: https://github.com/JuliaLang/julia/issues/24064 [#25278]: https://github.com/JuliaLang/julia/issues/25278 [#28156]: https://github.com/JuliaLang/julia/issues/28156 [#28506]: https://github.com/JuliaLang/julia/issues/28506 [#28696]: https://github.com/JuliaLang/julia/issues/28696 [#28708]: https://github.com/JuliaLang/julia/issues/28708 [#28745]: https://github.com/JuliaLang/julia/issues/28745 [#28761]: https://github.com/JuliaLang/julia/issues/28761 [#28790]: https://github.com/JuliaLang/julia/issues/28790 [#28878]: https://github.com/JuliaLang/julia/issues/28878 [#28902]: https://github.com/JuliaLang/julia/issues/28902 [#29033]: https://github.com/JuliaLang/julia/issues/29033 [#29092]: https://github.com/JuliaLang/julia/issues/29092 [#29108]: https://github.com/JuliaLang/julia/issues/29108 [#29127]: https://github.com/JuliaLang/julia/issues/29127 [#29153]: https://github.com/JuliaLang/julia/issues/29153 [#29157]: https://github.com/JuliaLang/julia/issues/29157 [#29173]: https://github.com/JuliaLang/julia/issues/29173 [#29211]: https://github.com/JuliaLang/julia/issues/29211 [#29259]: https://github.com/JuliaLang/julia/issues/29259 [#29316]: https://github.com/JuliaLang/julia/issues/29316 [#29429]: https://github.com/JuliaLang/julia/issues/29429 [#29440]: https://github.com/JuliaLang/julia/issues/29440 [#29442]: https://github.com/JuliaLang/julia/issues/29442 [#29469]: https://github.com/JuliaLang/julia/issues/29469 [#29506]: https://github.com/JuliaLang/julia/issues/29506 [#29595]: https://github.com/JuliaLang/julia/issues/29595 [#29600]: https://github.com/JuliaLang/julia/issues/29600 [#29615]: https://github.com/JuliaLang/julia/issues/29615 [#29636]: https://github.com/JuliaLang/julia/issues/29636 [#29638]: https://github.com/JuliaLang/julia/issues/29638 [#29670]: https://github.com/JuliaLang/julia/issues/29670 [#29679]: https://github.com/JuliaLang/julia/issues/29679 [#29733]: https://github.com/JuliaLang/julia/issues/29733 [#29739]: https://github.com/JuliaLang/julia/issues/29739 [#29749]: https://github.com/JuliaLang/julia/issues/29749 [#29754]: https://github.com/JuliaLang/julia/issues/29754 [#29781]: https://github.com/JuliaLang/julia/issues/29781 [#29782]: https://github.com/JuliaLang/julia/issues/29782 [#29819]: https://github.com/JuliaLang/julia/issues/29819 [#29827]: https://github.com/JuliaLang/julia/issues/29827 [#29845]: https://github.com/JuliaLang/julia/issues/29845 [#29858]: https://github.com/JuliaLang/julia/issues/29858 [#29890]: https://github.com/JuliaLang/julia/issues/29890 [#29893]: https://github.com/JuliaLang/julia/issues/29893 [#29907]: https://github.com/JuliaLang/julia/issues/29907 [#29913]: https://github.com/JuliaLang/julia/issues/29913 [#29926]: https://github.com/JuliaLang/julia/issues/29926 [#29968]: https://github.com/JuliaLang/julia/issues/29968 [#29969]: https://github.com/JuliaLang/julia/issues/29969 [#29978]: https://github.com/JuliaLang/julia/issues/29978 [#29980]: https://github.com/JuliaLang/julia/issues/29980 [#29997]: https://github.com/JuliaLang/julia/issues/29997 [#30004]: https://github.com/JuliaLang/julia/issues/30004 [#30022]: https://github.com/JuliaLang/julia/issues/30022 [#30035]: https://github.com/JuliaLang/julia/issues/30035 [#30083]: https://github.com/JuliaLang/julia/issues/30083 [#30102]: https://github.com/JuliaLang/julia/issues/30102 [#30151]: https://github.com/JuliaLang/julia/issues/30151 [#30159]: https://github.com/JuliaLang/julia/issues/30159 [#30160]: https://github.com/JuliaLang/julia/issues/30160 [#30226]: https://github.com/JuliaLang/julia/issues/30226 [#30249]: https://github.com/JuliaLang/julia/issues/30249 [#30270]: https://github.com/JuliaLang/julia/issues/30270 [#30278]: https://github.com/JuliaLang/julia/issues/30278 [#30341]: https://github.com/JuliaLang/julia/issues/30341 [#30342]: https://github.com/JuliaLang/julia/issues/30342 Julia v1.0.0 Release Notes ========================== Julia v1.0 is identical to the v0.7 release, with the exception that it removes all deprecations and deprecation related warnings. When upgrading a codebase from v0.6, the process is to first get the code to work on v0.7, and fix all the deprecation warnings. Once the code runs on v0.7 without warnings, it should be good to run on v1.0. Refer to the [Release Notes for v0.7](https://github.com/JuliaLang/julia/blob/master/HISTORY.md) for a detailed list of changes from Julia v0.6. Standard Library Changes ------------------------ * The `Libdl` module's methods `dlopen()` and `dlsym()` have gained a `throw_error` keyword argument, replacing the now-deprecated `dlopen_e()` and `dlsym_e()` methods. When `throw_error` is `false`, failure to locate a shared library or symbol will return `nothing` rather than `C_NULL`. ([#28888]) Deprecated or removed --------------------- * The old package manager (now called `OldPkg`) has been moved to a separate repository at https://github.com/JuliaArchive/OldPkg.jl ([#27930]) [#27930]: https://github.com/JuliaLang/julia/issues/27930 [#28888]: https://github.com/JuliaLang/julia/issues/28888 Julia v0.7.0 Release Notes ========================== New language features --------------------- * Local variables can be tested for being defined using the new `@isdefined variable` macro ([#22281]). * Destructuring in function arguments: when an expression such as `(x, y)` is used as a function argument name, the argument is unpacked into local variables `x` and `y` as in the assignment `(x, y) = arg` ([#6614]). * Named tuples, with the syntax `(a=1, b=2)`. These behave very similarly to tuples, except components can also be accessed by name using dot syntax `t.a` ([#22194]). * Keyword argument containers (`kw` in `f(; kw...)`) are now based on named tuples. Dictionary functions like `haskey` and indexing can be used on them, and name-value pairs can be iterated using `pairs(kw)`. `kw` can no longer contain multiple entries for the same argument name ([#4916]). * Custom infix operators can now be defined by appending Unicode combining marks, primes, and sub/superscripts to other operators. For example, `+̂ₐ″` is parsed as an infix operator with the same precedence as `+` ([#22089]). * The macro call syntax `@macroname[args]` is now available and is parsed as `@macroname([args])` ([#23519]). * The construct `if @generated ...; else ...; end` can be used to provide both `@generated` and normal implementations of part of a function. Surrounding code will be common to both versions ([#23168]). * Added `⟂` (`\perp`) operator with comparison precedence ([#24404]). * The `missing` singleton object (of type `Missing`) has been added to represent missing values ([#24653]). It propagates through standard operators and mathematical functions, and implements three-valued logic, similar to SQLs `NULL` and R's `NA`. * Field access via dot-syntax can now be overloaded by adding methods to `Base.getproperty` and `Base.setproperty!` ([#1974]), optionally along with a corresponding `Base.propertynames` method for reflection ([#25311]). * Values for `Enum`s can now be specified inside of a `begin` block when using the `@enum` macro ([#25424]). * Keyword arguments can be required: if a default value is omitted, then an exception is thrown if the caller does not assign the keyword a value ([#25830]). * The pair operator `=>` is now broadcastable as `.=>` which was previously a parsing error ([#27447]) Language changes ---------------- * The syntax for parametric methods, `function f{T}(x::T)`, has been changed to `function f(x::T) where {T}` ([#11310]). * The fallback constructor that calls `convert` is deprecated. Instead, new types should prefer to define constructors, and add `convert` methods that call those constructors only as necessary ([#15120]). * The syntax `1.+2` is deprecated, since it is ambiguous: it could mean either `1 .+ 2` (the current meaning) or `1. + 2` ([#19089]). * Mutable structs with no fields are no longer singletons; it is now possible to make multiple instances of them that can be distinguished by `===` ([#25854]). Zero-size immutable structs are still singletons. * In string and character literals, backslash `\` may no longer precede unrecognized escape characters ([#22800]). * Juxtaposing binary, octal, and hexadecimal literals is deprecated, since it can lead to confusing code such as `0xapi == 0xa * pi` ([#16356]). * Numeric literal juxtaposition now has slighty lower precedence than unary operators, so for example `√2x` parses as `(√2) * x` ([#27641]). * Declaring arguments as `x::ANY` to avoid specialization has been replaced by `@nospecialize x`. ([#22666]). This can also be used in global scope, to apply to all subsequent method definitions in the module (until `@specialize`). ([#28065]) * Keyword argument default values are now evaluated in successive scopes --- the scope for each expression includes only previous keyword arguments, in left-to-right order ([#17240]). * The parsing of `1<<2*3` as `1<<(2*3)` is deprecated, and will change to `(1<<2)*3` in a future version ([#13079]). * The parsing of `<|` is now right associative. `|>` remains left associative ([#24153]). * `:` now parses like other operators, as a call to a function named `:`, instead of calling `colon` ([#25947]). * `{ }` expressions now use `braces` and `bracescat` as expression heads instead of `cell1d` and `cell2d`, and parse similarly to `vect` and `vcat` ([#8470]). * Nested `if` expressions that arise from the keyword `elseif` now use `elseif` as their expression head instead of `if` ([#21774]). * `let` blocks now parse the same as `for` loops; the first argument is either an assignment or `block` of assignments, and the second argument is a block of statements ([#21774]). * `do` syntax now parses to an expression with head `:do`, instead of as a function call ([#21774]). * Parsed and lowered forms of type definitions have been synchronized with their new keywords ([#23157]). Expression heads are renamed as follows: + `type` => `struct` + `bitstype` => `primitive` (order of arguments is also reversed, to match syntax) + `composite_type` => `struct_type` + `bits_type` => `primitive_type` * The `global` keyword now only introduces a new binding if one doesn't already exist in the module. This means that assignment to a global (`global sin = 3`) may now throw the error: "cannot assign variable Base.sin from module Main", rather than emitting a warning. Additionally, the new bindings are now created before the statement is executed. For example, `f() = (global sin = "gluttony"; nothing)` will now resolve which module contains `sin` eagerly, rather than delaying that decision until `f` is run. ([#22984]). * `global const` declarations may no longer appear inside functions ([#12010]). * Uninitialized `BitArray` constructors of the form `BitArray[{N}](shape...)` have been deprecated in favor of equivalents accepting `undef` (an alias for `UndefInitializer()`) as their first argument, as in `BitArray[{N}](undef, shape...)`. For example, `BitVector(3)` is now `BitVector(undef, 3)`, `BitMatrix((2, 4))` is now `BitMatrix(undef, (2, 4))`, and `BitArray{3}(11, 13, 17)` is now `BitArray{3}(undef, 11, 14, 17)` ([#24785]). * Dispatch rules have been simplified: method matching is now determined exclusively by subtyping; the rule that method type parameters must also be captured has been removed. Instead, attempting to access the unconstrained parameters will throw an `UndefVarError`. Linting in package tests is recommended to confirm that the set of methods which might throw `UndefVarError` when accessing the static parameters (`need_to_handle_undef_sparam = Set{Any}(m.sig for m in Test.detect_unbound_args(Base, recursive=true))`) is equal (`==`) to some known set (`expected = Set()`). ([#23117]) * `const` declarations on local variables were previously ignored. They now give a warning, so that this syntax can be disallowed or given a new meaning in a future version ([#5148]). * Placing an expression after `catch`, as in `catch f(x)`, is deprecated. Use `catch; f(x)` instead ([#19987]). * In `for i = ...`, if a local variable `i` already existed it would be overwritten during the loop. This behavior is deprecated, and in the future `for` loop variables will always be new variables local to the loop ([#22314]). The old behavior of overwriting an existing variable is available via `for outer i = ...`. * In `for i in x`, `x` used to be evaluated in a new scope enclosing the `for` loop. Now it is evaluated in the scope outside the `for` loop. * In `for i in x, j in y`, all variables now have fresh bindings on each iteration of the innermost loop. For example, an assignment to `i` will not be visible on the next `j` loop iteration ([#330]). * Variable bindings local to `while` loop bodies are now freshly allocated on each loop iteration, matching the behavior of `for` loops. * Prefix `&` for by-reference arguments to `ccall` has been deprecated in favor of `Ref` argument types ([#6080]). * The constructor `Ref(x::T)` now always returns a `Ref{T}` ([#21527]). * All line numbers in ASTs are represented by `LineNumberNode`s; the `:line` expression head is no longer used. `QuoteNode`s are also consistently used for quoted symbols instead of the `:quote` expression head (though `:quote` `Expr`s are still used for quoted expressions) ([#23885]). * The `+` and `-` methods for `Number` and `UniformScaling` are not ambiguous anymore since `+` and `-` no longer do automatic broadcasting. Hence, the methods for `UniformScaling` and `Number` are no longer deprecated ([#23923]). * The keyword `importall` is deprecated. Use `using` and/or individual `import` statements instead ([#22789]). * `reduce(+, [...])` and `reduce(*, [...])` no longer widen the iterated over arguments to system word size. `sum` and `prod` still preserve this behavior. ([#22825]) * Like `_`, variable names consisting only of underscores can be assigned, but accessing their values is deprecated ([#24221]). * Raw string literal escaping rules have been changed to make it possible to write all strings. The rule is that backslashes escape both quotes and other backslashes, but only when a sequence of backslashes precedes a quote character. Thus, 2n backslashes followed by a quote encodes n backslashes and the end of the literal while 2n+1 backslashes followed by a quote encodes n backslashes followed by a quote character ([#22926]). * `reprmime(mime, x)` has been renamed to `repr(mime, x)`, and along with `repr(x)` and `sprint` it now accepts an optional `context` keyword for `IOContext` attributes. `stringmime` has been moved to the Base64 stdlib package ([#25990]). * The syntax `(x...)` for constructing a tuple is deprecated; use `(x...,)` instead ([#24452]). * Non-parenthesized interpolated variables in strings, e.g. `"$x"`, must be followed by a character that will never be an allowed identifier character (currently operators, space/control characters, or common punctuation characters) ([#25231]). * The syntax `using A.B` can now only be used when `A.B` is a module, and the syntax `using A: B` can only be used for adding single bindings ([#8000]). * `=>` now has its own precedence level, giving it strictly higher precedence than `=` and `,` ([#25391]). * The conditions under which unary operators followed by `(` are parsed as prefix function calls have changed ([#26154]). * `begin` is disallowed inside indexing expressions, in order to enable the syntax `a[begin]` (for selecting the first element) in the future ([#23354]). * Underscores for `_italics_` and `__bold__` are now supported by the Base Markdown parser. ([#25564]) * `…` (`\dots`) and `⁝` (`\tricolon`) are now parsed as binary operators ([#26262]). * Assignment syntax (`a=b`) inside square bracket expressions (e.g. `A[...]`, `[x, y]`) is deprecated. It will likely be reclaimed in a later version for passing keyword arguments. Note this does not affect updating operators like `+=` ([#25631]). * `try` blocks without `catch` or `finally` are no longer allowed. An explicit empty `catch` block should be written instead ([#27554]). * `AbstractArray` types that use unconventional (not 1-based) indexing can now support `size`, `length`, and `@inbounds`. To optionally enforce conventional indices, you can `@assert !has_offset_axes(A)`. * Module pre-compilation is now the default for code loading. Adding a `__precompile__()` declaration is no longer necessary, although `__precompile__(false)` can still be used to opt-out ([#26991]). Breaking changes ---------------- This section lists changes that do not have deprecation warnings. * The package manager `Pkg` has been replaced with a new one. See the manual entries on "Code Loading" and "Pkg" for documentation. * `replace(s::AbstractString, pat=>repl)` for function `repl` arguments formerly passed a substring to `repl` in all cases. It now passes substrings for string patterns `pat`, but a `Char` for character patterns (when `pat` is a `Char`, collection of `Char`, or a character predicate) ([#25815]). * `readuntil` now does *not* include the delimiter in its result, matching the behavior of `readline`. Pass `keep=true` to get the old behavior ([#25633]). * `lu` methods now return decomposition objects such as `LU` rather than tuples of arrays or tuples of numbers ([#26997], [#27159], [#27212]). * `schur` methods now return decomposition objects such as `Schur` and `GeneralizedSchur` rather than tuples of arrays ([#26997], [#27159], [#27212]). * `lq` methods now return decomposition objects such as `LQ` rather than tuples of arrays ([#26997], [#27159], [#27212]). * `qr` methods now return decomposition objects such as `QR`, `QRPivoted`, and `QRCompactWY` rather than tuples of arrays ([#26997], [#27159], [#27212]). * `svd` methods now return decomposition objects such as `SVD` and `GeneralizedSVD` rather than tuples of arrays or tuples of numbers ([#26997], [#27159], [#27212]). * `countlines` now always counts the last non-empty line even if it does not end with EOL, matching the behavior of `eachline` and `readlines` ([#25845]). * `getindex(s::String, r::UnitRange{Int})` now throws `StringIndexError` if `last(r)` is not a valid index into `s` ([#22572]). * `ntuple(f, n::Integer)` throws `ArgumentError` if `n` is negative. Previously an empty tuple was returned ([#21697]). * `⋮`, `⋱`, `⋰`, and `⋯` are now parsed as binary operators, not ordinary identifiers. `≔`, `≕`, and `⩴` now parse with assignment rather than comparison precedence ([#26262]). * Juxtaposing string literals (e.g. `"x"y`) is now a syntax error ([#20575]). * `finalizer(function, object)` now returns `object` rather than `nothing` ([#24679]). * The constructor of `SubString` now checks if the requested view range is defined by valid indices in the parent `AbstractString` ([#22511]). * Macro calls with `for` expressions are now parsed as generators inside function argument lists ([#18650]). Examples: + `sum(@inbounds a[i] for i = 1:n)` used to give a syntax error, but is now parsed as `sum(@inbounds(a[i]) for i = 1:n)`. + `sum(@m x for i = 1:n end)` used to parse the argument to `sum` as a 2-argument call to macro `@m`, but now parses it as a generator plus a syntax error for the dangling `end`. * `@__DIR__` returns the current working directory rather than `nothing` when not run from a file ([#21759]). * `@__FILE__` and `@__DIR__` return information relative to the file that it was parsed from, rather than from the task-local `SOURCE_PATH` global when it was expanded. * All macros receive an extra argument `__source__::LineNumberNode` which describes the parser location in the source file for the `@` of the macro call. It can be accessed as a normal argument variable in the body of the macro. This is implemented by inserting an extra leading argument into the `Expr(:macrocall, :@name, LineNumberNode(...), args...)` surface syntax. ([#21746]) * Passing the same keyword argument multiple times is now a syntax error ([#16937]). * `getsockname` on a `TCPSocket` now returns the locally bound address and port of the socket. Previously the address of the remote endpoint was being returned ([#21825]). * The `~/.juliarc.jl` file has been moved to `~/.julia/config/startup.jl` and `/etc/julia/juliarc.jl` file has been renamed to `/etc/julia/startup.jl` ([#26161]). * Using `ARGS` within `startup.jl` files or within a .jl file loaded with `--load` will no longer contain the script name as the first argument. Instead, the script name will be assigned to `PROGRAM_FILE`. ([#22092]) * The format for a `ClusterManager` specifying the cookie on the command line is now `--worker=`. `--worker ` will not work as it is now an optional argument. * The representation of `CartesianRange` has changed to a tuple-of-AbstractUnitRanges; the `start` and `stop` fields are no longer present. Use `first(R)` and `last(R)` to obtain start/stop. ([#20974]) * The `Diagonal`, `Bidiagonal`, `Tridiagonal` and `SymTridiagonal` type definitions have changed from `Diagonal{T}`, `Bidiagonal{T}`, `Tridiagonal{T}` and `SymTridiagonal{T}` to `Diagonal{T,V<:AbstractVector{T}}`, `Bidiagonal{T,V<:AbstractVector{T}}`, `Tridiagonal{T,V<:AbstractVector{T}}` and `SymTridiagonal{T,V<:AbstractVector{T}}` respectively ([#22718], [#22925], [#23035], [#23154]). * The immediate supertype of `BitArray` is now simply `AbstractArray`. `BitArray` is no longer considered a subtype of `DenseArray` and `StridedArray` ([#25858]). * When called with an argument that contains `NaN` elements, `findmin` and `findmax` now return the first `NaN` found and its corresponding index. Previously, `NaN` elements were ignored. The new behavior matches that of `min`, `max`, `minimum`, and `maximum`. * `isapprox(x,y)` now tests `norm(x-y) <= max(atol, rtol*max(norm(x), norm(y)))` rather than `norm(x-y) <= atol + ...`, and `rtol` defaults to zero if an `atol > 0` is specified ([#22742]). * Spaces are no longer allowed between `@` and the name of a macro in a macro call ([#22868]). * Juxtaposition of a non-literal with a macro call (`x@macro`) is no longer valid syntax ([#22868]). * On a cluster, all files are now loaded from the local file system rather than node 1 ([#22588]). To load the same file everywhere from node 1, one possible alternative is to broadcast a call to `include_string`: `@everywhere include_string(Main, $(read("filename", String)), "filename")`. Improving upon this API is left as an opportunity for packages. * `randperm(n)` and `randcycle(n)` now always return a `Vector{Int}` (independent of the type of `n`). Use the corresponding mutating functions `randperm!` and `randcycle!` to control the array type ([#22723]). * Hermitian now ignores any imaginary components in the diagonal instead of checking the diagonal. ([#17367]) * Worker-worker connections are setup lazily for an `:all_to_all` topology. Use keyword arg `lazy=false` to force all connections to be setup during a `addprocs` call. ([#22814]) * In `joinpath(a, b)` on Windows, if the drive specifications of `a` and `b` do not match, `joinpath` now returns `b` instead of throwing an `ArgumentError`. `joinpath(path...)` is defined to be left associative, so if any argument has a drive path which does not match the drive of the join of the preceding paths, the prior ones are dropped. ([#20912]) * `^(A::AbstractMatrix{<:Integer}, p::Integer)` now throws a `DomainError` if `p < 0`, unless `A == one(A)` or `A == -one(A)` (same as for `^(A::Integer, p::Integer)`) ([#23366]). * `^(A::AbstractMatrix{<:Integer}, p::Integer)` now promotes the element type in the same way as `^(A::Integer, p::Integer)`. This means, for instance, that `[1 1; 0 1]^big(1)` will return a `Matrix{BigInt}` instead of a `Matrix{Int}` ([#23366]). * The element type of the input is now preserved in `unique`. Previously the element type of the output was shrunk to fit the union of the type of each element in the input. ([#22696]) * The `promote` function now raises an error if its arguments are of different types and if attempting to convert them to a common type fails to change any of their types. This avoids stack overflows in the common case of definitions like `f(x, y) = f(promote(x, y)...)` ([#22801]). * `indmin` and `indmax` have been renamed to `argmin` and `argmax`, respectively ([#25654]). * `findmin`, `findmax`, `argmin`, and `argmax` used to always return linear indices. They now return `CartesianIndex`es for all but 1-d arrays, and in general return the `keys` of indexed collections (e.g. dictionaries) ([#22907]). * The `openspecfun` library is no longer built and shipped with Julia, as it is no longer used internally ([#22390]). * All loaded packages used to have bindings in `Main` (e.g. `Main.Package`). This is no longer the case; now bindings will only exist for packages brought into scope by typing `using Package` or `import Package` ([#17997]). * The rules for mixed-signedness integer arithmetic (e.g. `Int32(1) + UInt64(1)`) have been simplified: if the arguments have different sizes (in bits), then the type of the larger argument is used. If the arguments have the same size, the unsigned type is used ([#9292]). * All command line arguments passed via `-e`, `-E`, and `-L` will be executed in the order given on the command line ([#23665]). * `I` now yields `UniformScaling{Bool}(true)` rather than `UniformScaling{Int64}(1)` to better preserve types in operations involving `I` ([#24396]). * The return type of `reinterpret` has changed to `ReinterpretArray`. `reinterpret` on sparse arrays has been discontinued. * `Base.find_in_path` is now `Base.find_package` or `Base.find_source_file` ([#24320]). * `finalizer` now takes functions or pointers as its first argument, and the object being finalized as its second (rather than the reverse). For the majority of use cases deprecation warnings will be triggered. However, deprecation warnings will not trigger where (1) the callable argument is not a subtype of `Function`; or (2) both arguments are `Function`s or `Ptr{Cvoid}`s ([#24605]). * The `kill` function now throws errors on user error (e.g. on permission errors), but returns successfully if the process had previously exited. Its return value has been removed. Use the `process_running` function to determine if a process has already exited. * The logging system has been redesigned - `info` and `warn` are deprecated and replaced with the logging macros `@info`, `@warn`, `@debug` and `@error`. The `logging` function is also deprecated and replaced with `AbstractLogger` and the functions from the new standard `Logging` library. ([#24490]) * The `RevString` type has been removed from the language; `reverse(::String)` returns a `String` with code points (or fragments thereof) in reverse order. In general, `reverse(s)` should return a string of the same type and encoding as `s` with code points in reverse order; any string type overrides `reverse` to return a different type of string must also override `reverseind` to compute reversed indices correctly. * `eachindex(A, B...)` now requires that all inputs have the same number of elements. When the chosen indexing is Cartesian, they must have the same axes. * `AbstractRange` objects are now considered as equal to other `AbstractArray` objects by `==` and `isequal` if all of their elements are equal ([#16401]). This has required changing the hashing algorithm: ranges now use an O(N) fallback instead of a O(1) specialized method unless they define the `Base.RangeStepStyle` trait; see its documentation for details. Types which support subtraction (operator `-`) must now implement `widen` for hashing to work inside heterogeneous arrays. * `findn(x::AbstractArray)` has been deprecated in favor of `findall(!iszero, x)`, which now returns cartesian indices for multidimensional arrays (see below, [#25532]). * Broadcasting operations are no longer fused into a single operation by Julia's parser. Instead, a lazy `Broadcasted` object is created to represent the fused expression and then realized with `copy(bc::Broadcasted)` or `copyto!(dest, bc::Broadcasted)` to evaluate the wrapper. Consequently, package authors generally need to specialize `copy` and `copyto!` methods rather than `broadcast` and `broadcast!`. This also allows for more customization and control of fused broadcasts. See the [Interfaces chapter](https://docs.julialang.org/en/v1/manual/interfaces/#man-interfaces-broadcasting-1) for more information. * `find` has been renamed to `findall`. `findall`, `findfirst`, `findlast`, `findnext` now take and/or return the same type of indices as `keys`/`pairs` for `AbstractArray`, `AbstractDict`, `AbstractString`, `Tuple` and `NamedTuple` objects ([#24774], [#25545]). In particular, this means that they use `CartesianIndex` objects for matrices and higher-dimensional arrays instead of linear indices as was previously the case. Use `LinearIndices(a)[findall(f, a)]` and similar constructs to compute linear indices. * The `find*` functions, i.e. `findnext`, `findprev`, `findfirst`, and `findlast`, as well as `indexin`, now return `nothing` when no match is found rather than `0` or `0:-1` ([#25472], [#25662], [#26149]) * The `Base.HasShape` iterator trait has gained a type parameter `N` indicating the number of dimensions, which must correspond to the length of the tuple returned by `size` ([#25655]). * `AbstractSet` objects are now considered equal by `==` and `isequal` if all of their elements are equal ([#25368]). This has required changing the hashing algorithm for `BitSet`. * the default behavior of `titlecase` is changed in two ways ([#23393]): + characters not starting a word are converted to lowercase; a new keyword argument `strict` is added which allows to get the old behavior when it's `false`. + any non-letter character is considered as a word separator; to get the old behavior (only "space" characters are considered as word separators), use the keyword `wordsep=isspace`. * `writedlm` in the standard library module DelimitedFiles now writes numeric values using `print` rather than `print_shortest` ([#25745]). * The `tempname` function used to create a file on Windows but not on other platforms. It now never creates a file ([#9053]). * The `fieldnames` and `propertynames` functions now return a tuple rather than an array ([#25725]). * `indexin` now returns the first rather than the last matching index ([#25998]). * `parse(::Type, ::Char)` now uses a default base of 10, like other number parsing methods, instead of 36 ([#26576]). * `isequal` for `Ptr`s now compares element types; `==` still compares only addresses ([#26858]). * `widen` on 8- and 16-bit integer types now widens to 16- and 32-bit types, respectively. ([#28045]). * `mv`,`cp`, `touch`, `mkdir`, `mkpath`, `chmod` and `chown` now return the path that was created/modified rather than `nothing` ([#27071]). * Regular expressions now default to UCP mode. Escape sequences such as `\w` will now match based on unicode character properties, e.g. `r"\w+"` will match `café` (not just `caf`). Add the `a` modifier (e.g. `r"\w+"a`) to restore the previous behavior ([#27189]). * `@sync` now waits only for *lexically* enclosed (i.e. visible directly in the source text of its argument) `@async` expressions. If you need to wait for a task created by a called function `f`, have `f` return the task and put `@async wait(f(...))` within the `@sync` block. This change makes `@schedule` redundant with `@async`, so `@schedule` has been deprecated ([#27164]). * `norm(A::AbstractMatrix, p=2)` computes no longer the operator/matrix norm but the `norm` of `A` as for other iterables, i.e. as if it were a vector. Especially, `norm(A::AbstractMatrix)` is the Frobenius norm. To compute the operator/matrix norm, use the new function `opnorm` ([#27401]). * `dot(u, v)` now acts recursively. Instead of `sum(u[i]' * v[i] for i in ...)`, it computes `sum(dot(u[i], v[i]) for i in ...)`, similarly to `vecdot` before ([#27401]). * `Sys.CPU_CORES` has been renamed to `Sys.CPU_THREADS`; it still gives the number of "logical cores" (including hyperthreading) rather than the number of physical cores present on the CPU. Similarly, the environment variable `JULIA_CPU_CORES` is deprecated in favor of `JULIA_CPU_THREADS` ([#27856]). * `WeakKeyDict` does not convert keys on insertion anymore (#24941). Library improvements -------------------- * The function `thisind(s::AbstractString, i::Integer)` returns the largest valid index less or equal than `i` in the string `s` or `0` if no such index exists ([#24414]). * Support for Unicode 11 ([#28266]). * `Char` is now a subtype of `AbstractChar`, and most of the functions that take character arguments now accept any `AbstractChar` ([#26286]). * `pathof(module)` returns the path a module was imported from ([#28310]). * `bytes2hex` now accepts an optional `io` argument to output to a hexadecimal stream without allocating a `String` first ([#27121]). * `String(array)` now accepts an arbitrary `AbstractVector{UInt8}`. For `Vector` inputs, it "steals" the memory buffer, leaving them with an empty buffer which is guaranteed not to be shared with the `String` object. For other types of vectors (in particular immutable vectors), a copy is made and the input is not truncated ([#26093]). * `Irrational` is now a subtype of `AbstractIrrational` ([#24245]). * Introduced the `empty` function, the functional pair to `empty!` which returns a new, empty container ([#24390]). * Jump to first/last history entries in the REPL via "Alt-<" and "Alt->" ([#22829]). * REPL LaTeX-like tab completions have been simplified for several Unicode characters, e.g. `𝔸` is now `\bbA` rather than `\BbbA` ([#25980]). * The function `chop` now accepts two arguments `head` and `tail` allowing to specify number of characters to remove from the head and tail of the string ([#24126]). * `get(io, :color, false)` can now be used to query whether a stream `io` supports [ANSI color codes](https://en.wikipedia.org/wiki/ANSI_escape_code) ([#25067]), rather than using the undocumented `Base.have_color` global flag. * `print_with_color` has been deprecated in favor of `printstyled([io], xs...; bold=false, color=:normal)` for printing styled text ([#25522]). * Functions `first` and `last` now accept `nchar` argument for `AbstractString`. If this argument is used they return a string consisting of first/last `nchar` characters from the original string ([#23960]). * Expressions `x^-n` where `n` is an *integer literal* now correspond to `inv(x)^n`. For example, `x^-1` is now essentially a synonym for `inv(x)`, and works in a type-stable way even if `typeof(x) != typeof(inv(x))` ([#24240]). * New `Iterators.reverse(itr)` for reverse-order iteration ([#24187]). Iterator types `T` can implement `start` etc. for `Iterators.Reverse{T}` to support this. * The functions `nextind` and `prevind` now accept `nchar` argument that indicates the number of characters to move ([#23805]). * The functions `strip`, `lstrip` and `rstrip` now return `SubString` ([#22496]). * The functions `strwidth` and `charwidth` have been merged into `textwidth`([#20816]). * The functions `base` and `digits` digits now accept a negative base (like `ndigits` did) ([#21692]). * The function `randn` now accepts complex arguments (`Complex{T <: AbstractFloat}`) ([#21973]). * `parse(Complex{T}, string)` can parse complex numbers in some common formats ([#24713]). * The function `rand` can now pick up random elements from strings, associatives and sets ([#22228], [#21960], [#18155], [#22224]). * It's now possible to specify the characters to pick from in the `randstring` function ([#22222]). * Allow multidimensional arrays in `shuffle` and `shuffle!` functions ([#22226]). * Method lists are now printed as a numbered list. In addition, the source code of a method can be opened in an editor by entering the corresponding number in the REPL and pressing `^Q` ([#22007]). * `getpeername` on a `TCPSocket` returns the address and port of the remote endpoint of the TCP connection ([#21825]). * `resize!` and `sizehint!` methods no longer over-reserve memory when the requested array size is more than double of its current size ([#22038]). * The `crc32c` function for CRC-32c checksums is now exported ([#22274]). * `eye(::Type{Diagonal{T}}, m::Integer)` has been deprecated in favor of `Diagonal{T}(I, m)` ([#24415]). * The output of `versioninfo` is now controlled with keyword arguments ([#21974]). * The function `LibGit2.set_remote_url` now always sets both the fetch and push URLs for a git repo. Additionally, the argument order was changed to be consistent with the git command line tool ([#22062]). * Added `unique!` which is an inplace version of `unique` ([#20549]). * `@test isequal(x, y)` and `@test isapprox(x, y)` now prints an evaluated expression when the test fails ([#22296]). * Uses of `Val{c}` in `Base` has been replaced with `Val{c}()`, which is now easily accessible via the efficient constructor `Val(c)`. Functions are defined as `f(::Val{c}) = ...` and called by `f(Val(c))`. Notable affected functions include: `ntuple`, `Base.literal_pow`, `sqrtm`, `lufact`, `lufact!`, `qrfact`, `qrfact!`, `cholfact`, `cholfact!`, `_broadcast!`, `reshape`, `cat` and `cat_t`. * A new `@macroexpand1` macro for non recursive macro expansion ([#21662]). * `Char`s can now be concatenated with `String`s and/or other `Char`s using `*` ([#22532]). * `Diagonal`, `Bidiagonal`, `Tridiagonal` and `SymTridiagonal` are now parameterized on the type of the wrapped vectors, allowing `Diagonal`, `Bidiagonal`, `Tridiagonal` and `SymTridiagonal` matrices with arbitrary `AbstractVector`s ([#22718], [#22925], [#23035], [#23154]). * Mutating versions of `randperm` and `randcycle` have been added: `randperm!` and `randcycle!` ([#22723]). * `BigFloat` random numbers can now be generated ([#22720]). * The efficiency of random generation for MersenneTwister RNGs has been improved for integers, `Float64` and ranges; as a result, given a seed, the produced stream of numbers has changed ([#27560], [#25277], [#25197], [#25058], [#25047]). * REPL Undo via Ctrl-/ and Ctrl-_ * `diagm` now accepts several diagonal index/vector `Pair`s ([#24047]). * `isequal`, `==`, and `in` have one argument "curried" forms. For example `isequal(x)` returns a function that compares its argument to `x` using `isequal` ([#26436]). * `reinterpret` now works on any AbstractArray using the new `ReinterpretArray` type. This supersedes the old behavior of reinterpret on Arrays. As a result, reinterpreting arrays with different alignment requirements (removed in 0.6) is once again allowed ([#23750]). * The `keys` of an `Associative` are now an `AbstractSet`. `Base.KeyIterator{<:Associative}` has been changed to `KeySet{K, <:Associative{K}} <: AbstractSet{K}` ([#24580]). * New function `ncodeunits(s::AbstractString)` gives the number of code units in a string. The generic definition is constant time but calls `lastindex(s)` which may be inefficient. Therefore custom string types may want to define direct `ncodeunits` methods. * `reverseind(s::AbstractString, i::Integer)` now has an efficient generic fallback, so custom string types do not need to provide their own efficient definitions. The generic definition relies on `ncodeunits` however, so for optimal performance you may need to define a custom method for that function. * The global RNG is being re-seeded with its own seed at the beginning of each `@testset`, and have its original state restored at the end ([#24445]). This is breaking for testsets relying implicitly on the global RNG being in a specific state. * `permutedims(m::AbstractMatrix)` is now short for `permutedims(m, (2,1))`, and is now a more convenient way of making a "shallow transpose" of a 2D array. This is the recommended approach for manipulating arrays of data, rather than the recursively defined, linear-algebra function `transpose`. Similarly, `permutedims(v::AbstractVector)` will create a row matrix ([#24839]). * A new `replace(A, old=>new)` function is introduced to replace `old` by `new` in collection `A`. There is also another method with a different API, and a mutating variant, `replace!` ([#22324], [#25697], [#26206], [#27944]). * Adding integers to `CartesianIndex` objects is now deprecated. Instead of `i::Int + x::CartesianIndex`, use `i*one(x) + x` ([#26284]). * `CartesianRange` changes ([#24715]): - Inherits from `AbstractArray`, and linear indexing can be used to provide linear-to-cartesian conversion ([#24715]) - It has a new constructor taking an array * several missing set-like operations have been added ([#23528]): `union`, `intersect`, `symdiff`, `setdiff` are now implemented for all collections with arbitrary many arguments, as well as the mutating counterparts (`union!` etc.). The performance is also much better in many cases. Note that this change is slightly breaking: all the non-mutating functions always return a new object even if only one argument is passed. Moreover the semantics of `intersect` and `symdiff` is changed for vectors: + `intersect` doesn't preserve the multiplicity anymore (use `filter` for the old behavior) + `symdiff` has been made consistent with the corresponding methods for other containers, by taking the multiplicity of the arguments into account. Use `unique` to get the old behavior. * The `linearindices` function has been deprecated in favor of the new `LinearIndices` type, which additionally provides conversion from cartesian indices to linear indices using the normal indexing operation. ([#24715], [#26775]). * `IdDict{K,V}` replaces `ObjectIdDict`. It has type parameters like other `AbstractDict` subtypes and its constructors mirror the ones of `Dict`. ([#25210]) * `IOBuffer` can take the `sizehint` keyword argument to suggest a capacity of the buffer ([#25944]). * `lstrip` and `rstrip` now accept a predicate function that defaults to `isspace` ([#27309]). * `trunc`, `floor`, `ceil`, and `round` specify `digits`, `sigdigits` and `base` using keyword arguments. ([#26156], [#26670]) * `Sys.which()` provides a cross-platform method to find executable files, similar to the Unix `which` command. ([#26559]) * Added an optimized method of `vecdot` for taking the Frobenius inner product of sparse matrices. ([#27470]) * Added an optimized method of `kron` for taking the tensor product of two `Diagonal` matrices. ([27581]) * An official API for extending `rand` is now defined ([#23964], [#25002]). * The constructor `MersenneTwister()` is re-enabled, producing a randomly initialized RNG (similar to `Random.seed!(MersenneTwister(0))`) ([#21909]). * `BitSet` can now store any `Int` (instead of only positive ones) ([#25029]). * The initial element `v0` in `reduce(op, v0, itr)` has been replaced with an `init` optional keyword argument, as in `reduce(op, itr; init=v0)`. Similarly for `foldl`, `foldr`, `mapreduce`, `mapfoldl`, `mapfoldr`, `accumulate` and `accumulate!`. ([#27711], [#27859]) Compiler/Runtime improvements ----------------------------- * The inlining heuristic now models the approximate runtime cost of a method (using some strongly-simplifying assumptions). Functions are inlined unless their estimated runtime cost substantially exceeds the cost of setting up and issuing a subroutine call. ([#22210], [#22732]) * Inference recursion-detection heuristics are now more precise, allowing them to be triggered less often, but being more aggressive when they are triggered to drive the inference computation to a solution ([#23912]). * Inference now propagates constants inter-procedurally, and can compute various constants expressions at compile-time ([#24362]). * The LLVM SLP Vectorizer optimization pass is now enabled at the default optimization level. Deprecated or removed --------------------- * The `JULIA_HOME` environment variable has been renamed to `JULIA_BINDIR` and `Base.JULIA_HOME` has been moved to `Sys.BINDIR` ([#20899]). * The keyword `immutable` is fully deprecated to `struct`, and `type` is fully deprecated to `mutable struct` ([#19157], [#20418]). * `lufact`, `schurfact`, `lqfact`, `qrfact`, `ldltfact`, `svdfact`, `bkfact`, `hessfact`, `eigfact`, and `cholfact` have respectively been deprecated to `lu`, `schur`, `lq`, `qr`, `ldlt`, `svd`, `bunchkaufman`, `hessenberg`, `eigen`, and `cholesky` ([#26997], [#27159], [#27212]). * `lufact!`, `schurfact!`, `lqfact!`, `qrfact!`, `ldltfact!`, `svdfact!`, `bkfact!`, `hessfact!`, and `eigfact!` have respectively been deprecated to `lu!`, `schur!`, `lq!`, `qr!`, `ldlt!`, `svd!`, `bunchkaufman!`, `hessenberg!`, and `eigen!` ([#26997], [#27159], [#27212]). * `eig(A[, args...])` has been deprecated in favor of `eigen(A[, args...])`. Whereas the former returns a tuple of arrays, the latter returns an `Eigen` object. So for a direct replacement, use `(eigen(A[, args...])...,)`. But going forward, consider using the direct result of `eigen(A[, args...])` instead, either destructured into its components (`vals, vecs = eigen(A[, args...])`) or as an `Eigen` object (`X = eigen(A[, args...])`) ([#26997], [#27159], [#27212]). * `eig(A::AbstractMatrix, B::AbstractMatrix)` and `eig(A::Number, B::Number)` have been deprecated in favor of `eigen(A, B)`. Whereas the former each return a tuple of arrays, the latter returns a `GeneralizedEigen` object. So for a direct replacement, use `(eigen(A, B)...,)`. But going forward, consider using the direct result of `eigen(A, B)` instead, either destructured into its components (`vals, vecs = eigen(A, B)`), or as a `GeneralizedEigen` object (`X = eigen(A, B)`) ([#26997], [#27159], [#27212]). * `ordschur(T::StridedMatrix{Ty}, Z::StridedMatrix{Ty}, select::Union{Vector{Bool},BitVector})` and `ordschur(S::StridedMatrix{Ty}, T::StridedMatrix{Ty}, Q::StridedMatrix{Ty}, Z::StridedMatrix{Ty}, select::Union{Vector{Bool},BitVector})` and their respective inplace versions have been deprecated. Use `ordschur(schur::Schur, select::Union{Vector{Bool},BitVector})` and `ordschur(gschur::GeneralizedSchur, select::Union{Vector{Bool},BitVector})` instead ([#28155]). * Indexing into multidimensional arrays with more than one index but fewer indices than there are dimensions is no longer permitted when those trailing dimensions have lengths greater than 1. Instead, reshape the array or add trailing indices so the dimensionality and number of indices match ([#14770], [#23628]). * The use of a positional dimension argument has largely been deprecated in favor of a `dims` keyword argument. This includes the functions `sum`, `prod`, `maximum`, `minimum`, `all`, `any`, `findmax`, `findmin`, `mean`, `varm`, `std`, `var`, `cov`, `cor`, `median`, `mapreducedim`, `reducedim`, `sort`, `accumulate`, `accumulate!`, `cumsum`, `cumsum!`, `cumprod`, `cumprod!`, `flipdim`, `dropdims`, and `cat` ([#25501], [#26660], [#27100]). * `indices(a)` and `indices(a,d)` have been deprecated in favor of `axes(a)` and `axes(a, d)` ([#25057]). * `EnvHash` has been renamed to `EnvDict` ([#24167]). * Uninitialized `Array` constructors of the form `Array[{T,N}](shape...)` have been deprecated in favor of equivalents accepting `undef` (an alias for `UndefInitializer()`) as their first argument, as in `Array[{T,N}](undef, shape...)`. For example, `Vector(3)` is now `Vector(undef, 3)`, `Matrix{Int}((2, 4))` is now, `Matrix{Int}(undef, (2, 4))`, and `Array{Float32,3}(11, 13, 17)` is now `Array{Float32,3}(undef, 11, 13, 17)` ([#24781]). * Previously `setindex!(A, x, I...)` (and the syntax `A[I...] = x`) supported two different modes of operation when supplied with a set of non-scalar indices `I` (e.g., at least one index is an `AbstractArray`) depending upon the value of `x` on the right hand side. If `x` is an `AbstractArray`, its _contents_ are copied elementwise into the locations in `A` selected by `I` and it must have the same number of elements as `I` selects locations. Otherwise, if `x` is not an `AbstractArray`, then its _value_ is implicitly broadcast to all locations to all locations in `A` selected by `I`. This latter behavior—implicitly broadcasting "scalar"-like values across many locations—is now deprecated in favor of explicitly using the broadcasted assignment syntax `A[I...] .= x` or `fill!(view(A, I...), x)` ([#26347]). * `broadcast_getindex(A, I...)` and `broadcast_setindex!(A, v, I...)` are deprecated in favor of `getindex.((A,), I...)` and `setindex!.((A,), v, I...)`, respectively ([#27075]). * `LinAlg.fillslots!` has been renamed `LinAlg.fillstored!` ([#25030]). * `fill!(A::Diagonal, x)` and `fill!(A::AbstractTriangular, x)` have been deprecated in favor of `Base.LinAlg.fillstored!(A, x)` ([#24413]). * `eye` has been deprecated in favor of `I` and `Matrix` constructors. Please see the deprecation warnings for replacement details ([#24438]). * `zeros(D::Diagonal[, opts...])` has been deprecated ([#24654]). * Using Bool values directly as indices is now deprecated and will be an error in the future. Convert them to `Int` before indexing if you intend to access index `1` for `true` and `0` for `false`. * `slicedim(A, d, i)` has been deprecated in favor of `copy(selectdim(A, d, i))`. The new `selectdim` function now always returns a view into `A`; in many cases the `copy` is not necessary. Previously, `slicedim` on a vector `V` over dimension `d=1` and scalar index `i` would return the just selected element (unless `V` was a `BitVector`). This has now been made consistent: `selectdim` now always returns a view into the original array, with a zero-dimensional view in this specific case ([#26009]). * `whos` has been renamed `varinfo`, and now returns a markdown table instead of printing output ([#12131]). * Uninitialized `RowVector` constructors of the form `RowVector{T}(shape...)` have been deprecated in favor of equivalents accepting `undef` (an alias for `UndefInitializer()`) as their first argument, as in `RowVector{T}(undef, shape...)`. For example, `RowVector{Int}(3)` is now `RowVector{Int}(undef, 3)`, and `RowVector{Float32}((1, 4))` is now `RowVector{Float32}(undef, (1, 4))` ([#24786]). * `writecsv(io, a; opts...)` has been deprecated in favor of `writedlm(io, a, ','; opts...)` ([#23529]). * The method `srand(rng, filename, n=4)` has been deprecated ([#21359]). * `readcsv(io[, T::Type]; opts...)` has been deprecated in favor of `readdlm(io, ','[, T]; opts...)` ([#23530]). * `sparse(s::UniformScaling, m::Integer)` has been deprecated in favor of the three-argument equivalent `sparse(s::UniformScaling, m, n)` ([#24472]). * The `cholfact`/`cholfact!` methods that accepted an `uplo` symbol have been deprecated in favor of using `Hermitian` (or `Symmetric`) views ([#22187], [#22188]). * The `thin` keyword argument for orthogonal decomposition methods has been deprecated in favor of `full`, which has the opposite meaning: `thin == true` if and only if `full == false` ([#24279]). * `isposdef(A::AbstractMatrix, UL::Symbol)` and `isposdef!(A::AbstractMatrix, UL::Symbol)` have been deprecated in favor of `isposdef(Hermitian(A, UL))` and `isposdef!(Hermitian(A, UL))` respectively ([#22245]). * The `bkfact`/`bkfact!` methods that accepted `uplo` and `issymmetric` symbols have been deprecated in favor of using `Hermitian` (or `Symmetric`) views ([#22605]). * The function `current_module` is deprecated and replaced with `@__MODULE__`. This caused the deprecation of some reflection methods (such as `macroexpand` and `isconst`), which now require a module argument. And it caused the bugfix of other default arguments to use the Main module (including `whos`, `which`) ([#22064]). * `expand(ex)` and `expand(module, ex)` have been deprecated in favor of `Meta.lower(module, ex)` ([#22064], [#24278]). * `ones(A::AbstractArray[, opts...])` and `zeros(A::AbstractArray[, opts...])` methods have been deprecated. For `zeros(A)`, consider `zero(A)`. For `ones(A)` or `zeros(A)`, consider `ones(size(A))`, `zeros(size(A))`, `fill(v, size(A))` for `v` an appropriate one or zero, `fill!(copy(A), {1|0})`, `fill!(similar(A), {1|0})`, or any of the preceding with different element type and/or shape depending on `opts...`. Where strictly necessary, consider `fill!(similar(A[, opts...]), {one(eltype(A)) | zero(eltype(A))})`. For an algebraic multiplicative identity, consider `one(A)` ([#24656]). * The `similar(dims->f(..., dims...), [T], axes...)` method to add offset array support to a function `f` that would otherwise create a non-offset array has been deprecated. Instead, call `f(..., axes...)` directly and, if needed, the offset array implementation should add offset axis support to the function `f` directly ([#26733]). * The functions `ones` and `zeros` used to accept any objects as dimensional arguments, implicitly converting them to `Int`s. This is now deprecated; only `Integer`s or `AbstractUnitRange`s are accepted as arguments. Instead, convert the arguments before calling `ones` or `zeros` ([#26733]). * The variadic `size(A, dim1, dim2, dims...)` method to return a tuple of multiple dimension lengths of `A` has been deprecated ([#26862]). * The `Operators` module is deprecated. Instead, import required operators explicitly from `Base`, e.g. `import Base: +, -, *, /` ([#22251]). * Bindings to the FFTW library have been removed from Base. The DFT framework for building FFT implementations is now in AbstractFFTs.jl, the bindings to the FFTW library are in FFTW.jl, and the Base signal processing functions which used FFTs are now in DSP.jl ([#21956]). * The `corrected` positional argument to `cov` has been deprecated in favor of a keyword argument with the same name ([#21709]). * Omitting spaces around the `?` and the `:` tokens in a ternary expression has been deprecated. Ternaries must now include some amount of whitespace, e.g. `x ? a : b` rather than `x?a:b` ([#22523] and [#22712]). * `?` can no longer be used as an identifier name ([#22712]) * The method `replace(s::AbstractString, pat, r, [count])` is deprecated in favor of `replace(s::AbstractString, pat => r; [count])` ([#25165]). Moreover, `count` cannot be negative anymore (use `typemax(Int)` instead ([#22325]). * `read(io, type, dims)` is deprecated to `read!(io, Array{type}(undef, dims))` ([#21450]). * `read(::IO, ::Ref)` is now a method of `read!`, since it mutates its `Ref` argument ([#21592]). * `nb_available` is now `bytesavailable` ([#25634]). * `skipchars(io::IO, predicate; linecomment=nothing)` is deprecated in favor of `skipchars(predicate, io::IO; linecomment=nothing)` ([#25667]). * `Bidiagonal` constructors now use a `Symbol` (`:U` or `:L`) for the upper/lower argument, instead of a `Bool` or a `Char` ([#22703]). * `Bidiagonal`, `Tridiagonal` and `SymTridiagonal` constructors that automatically converted the input vectors to the same type are deprecated in favor of explicit conversion ([#22925], [#23035], [#23154]. * Calling `nfields` on a type to find out how many fields its instances have is deprecated. Use `fieldcount` instead. Use `nfields` only to get the number of fields in a specific object ([#22350]). * `fieldnames` now operates only on types. To get the names of fields in an object, use `fieldnames(typeof(x))` ([#22350]). * `InexactError`, `DomainError`, and `OverflowError` now take arguments. `InexactError(func::Symbol, type, -3)` now prints as "ERROR: InexactError: func(type, -3)", `DomainError(val, [msg])` prints as "ERROR: DomainError with val:\nmsg", and `OverflowError(msg)` prints as "ERROR: OverflowError: msg". ([#20005], [#22751], [#22761]) * The operating system identification functions: `is_linux`, `is_bsd`, `is_apple`, `is_unix`, and `is_windows`, have been deprecated in favor of `Sys.islinux`, `Sys.isbsd`, `Sys.isapple`, `Sys.isunix`, and `Sys.iswindows`, respectively ([#22182]). * The forms of `read`, `readstring`, and `eachline` that accepted both a `Cmd` object and an input stream are deprecated. Use e.g. `read(pipeline(stdin, cmd))` instead ([#22762]). * The unexported type `AbstractIOBuffer` has been renamed to `GenericIOBuffer` ([#17360] [#22796]). * `IOBuffer(data::AbstractVector{UInt8}, read::Bool, write::Bool, maxsize::Integer)`, `IOBuffer(read::Bool, write::Bool)`, and `IOBuffer(maxsize::Integer)` are deprecated in favor of constructors taking keyword arguments ([#25872]). * `Display` has been renamed to `AbstractDisplay` ([#24831]). * Remaining vectorized methods over `SparseVector`s, particularly `floor`, `ceil`, `trunc`, `round`, and most common transcendental functions such as `exp`, `log`, and `sin` variants, have been deprecated in favor of dot-syntax ([#22961]). * The method `String(io::IOBuffer)` is deprecated to `String(take!(copy(io)))` ([#21438]). * The function `readstring` is deprecated in favor of `read(io, String)` ([#22793]) * The function `showall` is deprecated. Showing entire values is the default, unless an `IOContext` specifying `:limit=>true` is in use ([#22847]). * `issubtype` has been deprecated in favor of `<:` (which used to be an alias for `issubtype`). * Calling `write` on non-isbits arrays is deprecated in favor of explicit loops or `serialize` ([#6466]). * The default `startup.jl` file on Windows has been removed. Now must explicitly include the full path if you need access to executables or libraries in the `Sys.BINDIR` directory, e.g. `joinpath(Sys.BINDIR, "7z.exe")` for `7z.exe` ([#21540]). * `sqrtm` has been deprecated in favor of `sqrt` ([#23504]). * `expm` has been deprecated in favor of `exp` ([#23233]). * `logm` has been deprecated in favor of `log` ([#23505]). * `full` has been deprecated in favor of more specific, better defined alternatives. On structured matrices `A`, consider instead `Matrix(A)`, `Array(A)`, `SparseMatrixCSC(A)`, or `sparse(A)`. On sparse arrays `S`, consider instead `Vector(S)`, `Matrix(S)`, or `Array(S)` as appropriate. On factorizations `F`, consider instead `Matrix(F)`, `Array(F)`, `AbstractMatrix(F)`, or `AbstractArray(F)`. On implicit orthogonal factors `Q`, consider instead `Matrix(Q)` or `Array(Q)`; for implicit orthogonal factors that can be recovered in square or truncated form, see the deprecation message for square recovery instructions. On `Symmetric`, `Hermitian`, or `AbstractTriangular` matrices `A`, consider instead `Matrix(S)`, `Array(S)`, `SparseMatrixCSC(S)`, or `sparse(S)`. On `Symmetric` matrices `A` particularly, consider instead `LinAlg.copytri!(copy(parent(A)), A.uplo)`. On `Hermitian` matrices `A` particularly, consider instead `LinAlg.copytri!(copy(parent(A)), A.uplo, true)`. On `UpperTriangular` matrices `A` particularly, consider instead `triu!(copy(parent(A)))`. On `LowerTriangular` matrices `A` particularly, consider instead `tril!(copy(parent(A)))` ([#24250]). * `speye` has been deprecated in favor of `I`, `sparse`, and `SparseMatrixCSC` constructor methods ([#24356]). * Calling `union` with no arguments is deprecated; construct an empty set with an appropriate element type using `Set{T}()` instead ([#23144]). * Vectorized `DateTime`, `Date`, and `format` methods have been deprecated in favor of dot-syntax ([#23207]). * `Base.cpad` has been removed; use an appropriate combination of `rpad` and `lpad` instead ([#23187]). * `ctranspose` and `ctranspose!` have been deprecated in favor of `adjoint` and `adjoint!`, respectively ([#23235]). * `filter` and `filter!` on dictionaries now pass a single `key=>value` pair to the argument function, instead of two arguments ([#17886]). * `rol`, `rol!`, `ror`, and `ror!` have been deprecated in favor of specialized methods for `circshift`/`circshift!` ([#23404]). * `Base.SparseArrays.SpDiagIterator` has been removed ([#23261]). * The function `cfunction`, has been deprecated in favor of a macro form `@cfunction`. Most existing uses can be upgraded simply by adding a `@`. The new syntax now additionally supports allocating closures at runtime, for dealing with C APIs that don't provide a separate `void* env`-type callback argument. ([#26486]) * `diagm(v::AbstractVector, k::Integer=0)` has been deprecated in favor of `diagm(k => v)` ([#24047]). * `diagm(x::Number)` has been deprecated in favor of `fill(x, 1, 1)` ([#24047]). * `diagm(A::SparseMatrixCSC)` has been deprecated in favor of `spdiagm(sparsevec(A))` ([#23341]). * `diagm(A::BitMatrix)` has been deprecated, use `diagm(0 => vec(A))` or `BitMatrix(Diagonal(vec(A)))` instead ([#23373], [#24047]). * `ℯ` (written as `\mscre` or `\euler`) is now the only (by default) exported name for Euler's number, and the type has changed from `Irrational{:e}` to `Irrational{:ℯ}` ([#23427]). * The mathematical constants `π`, `pi`, `ℯ`, `e`, `γ`, `eulergamma`, `catalan`, `φ` and `golden` have been moved from `Base` to a new module; `Base.MathConstants`. Only `π`, `pi` and `ℯ` are now exported by default from `Base` ([#23427]). * `eu` (previously an alias for `ℯ`) has been deprecated in favor of `ℯ` (or `MathConstants.e`) ([#23427]). * `GMP.gmp_version()`, `GMP.GMP_VERSION`, `GMP.gmp_bits_per_limb()`, and `GMP.GMP_BITS_PER_LIMB` have been renamed to `GMP.version()`, `GMP.VERSION`, `GMP.bits_per_limb()`, and `GMP.BITS_PER_LIMB`, respectively. Similarly, `MPFR.get_version()`, has been renamed to `MPFR.version()` ([#23323]). Also, `LinAlg.LAPACK.laver()` has been renamed to `LinAlg.LAPACK.version()` and now returns a `VersionNumber`. * `select`, `select!`, `selectperm` and `selectperm!` have been renamed respectively to `partialsort`, `partialsort!`, `partialsortperm` and `partialsortperm!` ([#23051]). * The `Range` abstract type has been renamed to `AbstractRange` ([#23570]). * `map` on dictionaries previously operated on `key=>value` pairs. This behavior is deprecated, and in the future `map` will operate only on values ([#5794]). * `map` on sets previously returned a `Set`, possibly changing the order or number of elements. This behavior is deprecated and in the future `map` will preserve order and number of elements ([#26980]). * Previously, broadcast defaulted to treating its arguments as scalars if they were not arrays. This behavior is deprecated, and in the future `broadcast` will default to iterating over all its arguments. Wrap arguments you wish to be treated as scalars with `Ref()` or a 1-tuple. Package developers can choose to allow a non-iterable type `T` to always behave as a scalar by implementing `broadcastable(x::T) = Ref(x)` ([#26212]). * Automatically broadcasted `+` and `-` for `array + scalar`, `scalar - array`, and so-on have been deprecated due to inconsistency with linear algebra. Use `.+` and `.-` for these operations instead ([#22880], [#22932]). * `flipbits!(B)` is deprecated in favor of using in-place broadcast to negate each element: `B .= .!B` ([#27067]). * `isleaftype` is deprecated in favor of the simpler predicates `isconcretetype` and `isdispatchtuple`. Concrete types are those that might equal `typeof(x)` for some `x`; `isleaftype` included some types for which this is not true. Those are now categorized more precisely as "dispatch tuple types" and "!has_free_typevars" (not exported). ([#17086], [#25496]) * `contains(eq, itr, item)` is deprecated in favor of `any` with a predicate ([#23716]). * `spdiagm(x::AbstractVector)` has been deprecated in favor of `sparse(Diagonal(x))` alternatively `spdiagm(0 => x)` ([#23757]). * `spdiagm(x::AbstractVector, d::Integer)` and `spdiagm(x::Tuple{<:AbstractVector}, d::Tuple{<:Integer})` have been deprecated in favor of `spdiagm(d => x)` and `spdiagm(d[1] => x[1], d[2] => x[2], ...)` respectively. The new `spdiagm` implementation now always returns a square matrix ([#23757]). * `spones(A::AbstractSparseArray)` has been deprecated in favor of `LinAlg.fillstored!(copy(A), 1)` ([#25037]). * Constructors for `LibGit2.UserPasswordCredentials` and `LibGit2.SSHCredentials` which take a `prompt_if_incorrect` argument are deprecated. Instead, prompting behavior is controlled using the `allow_prompt` keyword in the `LibGit2.CredentialPayload` constructor ([#23690]). * `gradient` is deprecated and will be removed in the next release ([#23816]). * The timing functions `tic`, `toc`, and `toq` are deprecated in favor of `@time` and `@elapsed` ([#17046]). * Methods of `findfirst`, `findnext`, `findlast`, and `findprev` that accept a value to search for are deprecated in favor of passing a predicate ([#19186], [#10593]). * `find` functions now operate only on booleans by default. To look for non-zeros, use `x->x!=0` or `!iszero` ([#23120]). * The ability of `reinterpret` to yield `Array`s of different type than the underlying storage has been removed. The `reinterpret` function is still available, but now returns a `ReinterpretArray`. The three argument form of `reinterpret` that implicitly reshapes has been deprecated ([#23750]). * `bits` has been deprecated in favor of `bitstring` ([#24281], [#24263]). * `num2hex` and `hex2num` have been deprecated in favor of `reinterpret` combined with `parse`/`hex` ([#22088]). * `copy!` is deprecated for `AbstractSet` and `AbstractDict`, with the intention to re-enable it with a cleaner meaning in a future version ([#24844]). * `copy!` (resp. `unsafe_copy!`) is deprecated for `AbstractArray` and is renamed `copyto!` (resp. `unsafe_copyto!`); it will be re-introduced with a different meaning in a future version ([#24808]). * `a:b` is deprecated for constructing a `StepRange` when `a` and `b` have physical units (Dates and Times). Use `a:s:b`, where `s = Dates.Day(1)` or `s = Dates.Second(1)`. * `trues(A::AbstractArray)` and `falses(A::AbstractArray)` are deprecated in favor of `trues(size(A))` and `falses(size(A))` respectively ([#24595]). * `workspace` is discontinued, check out [Revise.jl](https://github.com/timholy/Revise.jl) for an alternative workflow ([#25046]). * `cumsum`, `cumprod`, `accumulate`, their mutating versions, and `diff` all now require a `dim` argument instead of defaulting to using the first dimension unless there is only one dimension ([#24684], [#25457]). * The `sum_kbn` and `cumsum_kbn` functions have been moved to the [KahanSummation](https://github.com/JuliaMath/KahanSummation.jl) package ([#24869]). * `isnumber` has been renamed to `isnumeric` ([#25021]). * `isalpha` has been renamed to `isletter` ([#26932]). * `is_assigned_char` and `normalize_string` have been renamed to `isassigned` and `normalize`, and moved to the new `Unicode` standard library module. `graphemes` has also been moved to that module ([#25021]). * Sparse array functionality has moved to the `SparseArrays` standard library module ([#25249]). * Linear algebra functionality, and specifically the `LinAlg` module has moved to the `LinearAlgebra` standard library module ([#25571]). * `@printf` and `@sprintf` have been moved to the `Printf` standard library ([#23929],[#25056]). * The `Libdl` module has moved to the `Libdl` standard library module ([#25459]). * The aliases `Complex32`, `Complex64` and `Complex128` have been deprecated in favor of `ComplexF16`, `ComplexF32` and `ComplexF64` respectively ([#24647]). * `Base.parentindexes` and `SharedArrays.localindexes` have been renamed to `parentindices` and `localindices`, respectively. Similarly, the `indexes` field in the `SubArray` type has been renamed to `indices` without deprecation ([#25088]). * `Associative` has been deprecated in favor of `AbstractDict` ([#25012]). * `Void` has been renamed back to `Nothing` with an alias `Cvoid` for use when calling C with a return type of `Cvoid` or a return or argument type of `Ptr{Cvoid}` ([#25162]). * `Nullable{T}` has been deprecated and moved to the Nullables package ([#23642]). Use `Union{T, Nothing}` instead, or `Union{Some{T}, Nothing}` if `nothing` is a possible value (i.e. `Nothing <: T`). `isnull(x)` can be replaced with `x === nothing` and `unsafe_get`/`get` can be dropped or replaced with `coalesce`. `NullException` has been removed. * `unshift!` and `shift!` have been renamed to `pushfirst!` and `popfirst!` ([#23902]) * `ipermute!` has been deprecated in favor of `invpermute!` ([#25168]). * `CartesianRange` has been renamed `CartesianIndices` ([#24715]). * `sub2ind` and `ind2sub` are deprecated in favor of using `CartesianIndices` and `LinearIndices` ([#24715]). * `getindex(F::Factorization, s::Symbol)` (usually seen as e.g. `F[:Q]`) is deprecated in favor of dot overloading (`getproperty`) so factors should now be accessed as e.g. `F.Q` instead of `F[:Q]` ([#25184]). * `search` and `rsearch` have been deprecated in favor of `findfirst`/`findnext` and `findlast`/`findprev` respectively, in combination with curried `isequal` and `in` predicates for some methods ([#24673]). * `search(buf::IOBuffer, delim::UInt8)` has been deprecated in favor of either `occursin(delim, buf)` (to test containment) or `readuntil(buf, delim)` (to read data up to `delim`) ([#26600]). * `ismatch(regex, str)` has been deprecated in favor of `occursin(regex, str)` ([#26283]). * `matchall` has been deprecated in favor of `collect(m.match for m in eachmatch(r, s))` ([#26071]). * `similar(::Associative)` has been deprecated in favor of `empty(::Associative)`, and `similar(::Associative, ::Pair{K, V})` has been deprecated in favour of `empty(::Associative, K, V)` ([#24390]). * `findin(a, b)` has been deprecated in favor of `findall(in(b), a)` ([#24673]). * `module_name` has been deprecated in favor of a new, general `nameof` function. Similarly, the unexported `Base.function_name` and `Base.datatype_name` have been deprecated in favor of `nameof` methods ([#25622]). * The module `Random.dSFMT` is renamed `Random.DSFMT` ([#25567]). * `Random.RandomDevice(unlimited::Bool)` (on non-Windows systems) is deprecated in favor of `Random.RandomDevice(; unlimited=unlimited)` ([#25668]). * The generic implementations of `strides(::AbstractArray)` and `stride(::AbstractArray, ::Int)` have been deprecated. Subtypes of `AbstractArray` that implement the newly introduced strided array interface should define their own `strides` method ([#25321]). * `module_parent`, `Base.datatype_module`, and `Base.function_module` have been deprecated in favor of `parentmodule` ([#TODO]). * `rand(t::Tuple{Vararg{Int}})` is deprecated in favor of `rand(Float64, t)` or `rand(t...)`; `rand(::Tuple)` will have another meaning in the future ([#25429], [#25278]). * `randjump`, which produced an array, is deprecated in favor of the scalar version `Future.randjump` used with `accumulate` ([#27746]). * The `assert` function (and `@assert` macro) have been documented that they are not guaranteed to run under various optimization levels and should therefore not be used to e.g. verify passwords. * `ObjectIdDict` has been deprecated in favor of `IdDict{Any,Any}` ([#25210]). * `gc` and `gc_enable` have been deprecated in favor of `GC.gc` and `GC.enable` ([#25616]). * `Base.@gc_preserve` has been deprecated in favor of `GC.@preserve` ([#25616]). * `print_shortest` has been discontinued, but is still available in the `Base.Grisu` submodule ([#25745]). * `scale!` has been deprecated in favor of `mul!`, `lmul!`, and `rmul!` ([#25701], [#25812]). * The `remove_destination` keyword argument to `cp`, `mv`, and the unexported `cptree` has been renamed to `force` ([#25979]). * `contains` has been deprecated in favor of a more general `occursin` function, which takes its arguments in reverse order from `contains` ([#26283]). * `Regex` objects are no longer callable. Use `occursin` instead ([#26283]). * The methods of `range` based on positional arguments have been deprecated in favor of keyword arguments ([#25896]). * `linspace` has been deprecated in favor of `range` with `stop` and `length` keyword arguments ([#25896]). * `LinSpace` has been renamed to `LinRange` ([#25896]). * `logspace` has been deprecated to its definition ([#25896]). * `endof(a)` has been renamed to `lastindex(a)`, and the `end` keyword in indexing expressions now lowers to either `lastindex(a)` (in the case with only one index) or `lastindex(a, d)` (in cases where there is more than one index and `end` appears at dimension `d`) ([#23554], [#25763]). * `DateTime()`, `Date()`, and `Time()` have been deprecated, instead use `DateTime(1)`, `Date(1)` and `Time(0)` respectively ([#23724]). * The fallback method `^(x, p::Integer)` is deprecated. If your type relied on this definition, add a method such as `^(x::MyType, p::Integer) = Base.power_by_squaring(x, p)` ([#23332]). * `DevNull`, `STDIN`, `STDOUT`, and `STDERR` have been renamed to `devnull`, `stdin`, `stdout`, and `stderr`, respectively ([#25786]). * `wait` and `fetch` on `Task` now resemble the interface of `Future`. * `showcompact(io, x...)` has been deprecated in favor of `show(IOContext(io, :compact => true), x...)` ([#26080]). Use `sprint(show, x..., context=:compact => true)` instead of `sprint(showcompact, x...)`. * `isupper`, `islower`, `ucfirst` and `lcfirst` have been deprecated in favor of `isuppercase`, `islowercase`, `uppercasefirst` and `lowercasefirst`, respectively ([#26442]). * `signif` has been deprecated in favor of the `sigdigits` keyword argument to `round`. * `Base.IntSet` has been deprecated in favor of `Base.BitSet` ([#24282]). * `setrounding` has been deprecated for `Float32` and `Float64`, as the behaviour was too unreliable ([#26935]). * `gamma`, `lgamma`, `beta`, `lbeta` and `lfact` have been moved to [SpecialFunctions.jl](https://github.com/JuliaMath/SpecialFunctions.jl) ([#27459], [#27473]). * `atan2` is now a 2-argument method of `atan` ([#27248]). * The functions `eigs` and `svds` have been moved to the `Arpack.jl` package ([#27616]). * `vecdot` and `vecnorm` are deprecated in favor of `dot` and `norm`, respectively ([#27401]). * `clipboard` has been moved to the `InteractiveUtils` standard library package (along with other utilities mostly used at the interactive prompt, such as `edit` and `less`) ([#27635]). * `ndigits(n, b, [pad])` is deprecated in favor of `ndigits(n, base=b, pad=pad)` ([#27908]). * `squeeze` is deprecated in favor of `dropdims`. * `srand` is deprecated in favor of the unexported `Random.seed!` ([#27726]). * `realmin`/`realmax` are deprecated in favor of `floatmin`/`floatmax` ([#28302]). * `sortrows`/`sortcols` have been deprecated in favor of the more general `sortslices`. * `nextpow2`/`prevpow2` have been deprecated in favor of the more general `nextpow`/`prevpow` functions. Command-line option changes --------------------------- * New option `--warn-overwrite={yes|no}` to control the warning for overwriting method definitions. The default is `no` ([#23002]). * New option `--banner={yes,no}` allows suppressing or forcing the printing of the startup banner, overriding the default behavior (banner in REPL, no banner otherwise). The `--quiet` option implies `--banner=no` even in REPL mode but can be overridden by passing `--quiet` together with `--banner=yes` ([#23342]). * The option `--precompiled` has been renamed to `--sysimage-native-code` ([#23054]). * The option `--compilecache` has been renamed to `--compiled-modules` ([#23054]). [#330]: https://github.com/JuliaLang/julia/issues/330 [#1974]: https://github.com/JuliaLang/julia/issues/1974 [#4916]: https://github.com/JuliaLang/julia/issues/4916 [#5148]: https://github.com/JuliaLang/julia/issues/5148 [#5794]: https://github.com/JuliaLang/julia/issues/5794 [#6080]: https://github.com/JuliaLang/julia/issues/6080 [#6466]: https://github.com/JuliaLang/julia/issues/6466 [#6614]: https://github.com/JuliaLang/julia/issues/6614 [#8000]: https://github.com/JuliaLang/julia/issues/8000 [#8470]: https://github.com/JuliaLang/julia/issues/8470 [#9053]: https://github.com/JuliaLang/julia/issues/9053 [#9292]: https://github.com/JuliaLang/julia/issues/9292 [#10593]: https://github.com/JuliaLang/julia/issues/10593 [#11310]: https://github.com/JuliaLang/julia/issues/11310 [#12010]: https://github.com/JuliaLang/julia/issues/12010 [#12131]: https://github.com/JuliaLang/julia/issues/12131 [#13079]: https://github.com/JuliaLang/julia/issues/13079 [#14770]: https://github.com/JuliaLang/julia/issues/14770 [#15120]: https://github.com/JuliaLang/julia/issues/15120 [#16356]: https://github.com/JuliaLang/julia/issues/16356 [#16401]: https://github.com/JuliaLang/julia/issues/16401 [#16937]: https://github.com/JuliaLang/julia/issues/16937 [#17046]: https://github.com/JuliaLang/julia/issues/17046 [#17086]: https://github.com/JuliaLang/julia/issues/17086 [#17240]: https://github.com/JuliaLang/julia/issues/17240 [#17360]: https://github.com/JuliaLang/julia/issues/17360 [#17367]: https://github.com/JuliaLang/julia/issues/17367 [#17886]: https://github.com/JuliaLang/julia/issues/17886 [#17997]: https://github.com/JuliaLang/julia/issues/17997 [#18155]: https://github.com/JuliaLang/julia/issues/18155 [#18650]: https://github.com/JuliaLang/julia/issues/18650 [#19089]: https://github.com/JuliaLang/julia/issues/19089 [#19157]: https://github.com/JuliaLang/julia/issues/19157 [#19186]: https://github.com/JuliaLang/julia/issues/19186 [#19987]: https://github.com/JuliaLang/julia/issues/19987 [#20005]: https://github.com/JuliaLang/julia/issues/20005 [#20418]: https://github.com/JuliaLang/julia/issues/20418 [#20549]: https://github.com/JuliaLang/julia/issues/20549 [#20575]: https://github.com/JuliaLang/julia/issues/20575 [#20816]: https://github.com/JuliaLang/julia/issues/20816 [#20899]: https://github.com/JuliaLang/julia/issues/20899 [#20912]: https://github.com/JuliaLang/julia/issues/20912 [#20974]: https://github.com/JuliaLang/julia/issues/20974 [#21359]: https://github.com/JuliaLang/julia/issues/21359 [#21438]: https://github.com/JuliaLang/julia/issues/21438 [#21450]: https://github.com/JuliaLang/julia/issues/21450 [#21527]: https://github.com/JuliaLang/julia/issues/21527 [#21540]: https://github.com/JuliaLang/julia/issues/21540 [#21592]: https://github.com/JuliaLang/julia/issues/21592 [#21662]: https://github.com/JuliaLang/julia/issues/21662 [#21692]: https://github.com/JuliaLang/julia/issues/21692 [#21697]: https://github.com/JuliaLang/julia/issues/21697 [#21709]: https://github.com/JuliaLang/julia/issues/21709 [#21746]: https://github.com/JuliaLang/julia/issues/21746 [#21759]: https://github.com/JuliaLang/julia/issues/21759 [#21774]: https://github.com/JuliaLang/julia/issues/21774 [#21825]: https://github.com/JuliaLang/julia/issues/21825 [#21909]: https://github.com/JuliaLang/julia/issues/21909 [#21956]: https://github.com/JuliaLang/julia/issues/21956 [#21960]: https://github.com/JuliaLang/julia/issues/21960 [#21973]: https://github.com/JuliaLang/julia/issues/21973 [#21974]: https://github.com/JuliaLang/julia/issues/21974 [#22007]: https://github.com/JuliaLang/julia/issues/22007 [#22038]: https://github.com/JuliaLang/julia/issues/22038 [#22062]: https://github.com/JuliaLang/julia/issues/22062 [#22064]: https://github.com/JuliaLang/julia/issues/22064 [#22088]: https://github.com/JuliaLang/julia/issues/22088 [#22089]: https://github.com/JuliaLang/julia/issues/22089 [#22092]: 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https://github.com/JuliaLang/julia/issues/27554 [#27560]: https://github.com/JuliaLang/julia/issues/27560 [#27616]: https://github.com/JuliaLang/julia/issues/27616 [#27635]: https://github.com/JuliaLang/julia/issues/27635 [#27641]: https://github.com/JuliaLang/julia/issues/27641 [#27711]: https://github.com/JuliaLang/julia/issues/27711 [#27726]: https://github.com/JuliaLang/julia/issues/27726 [#27746]: https://github.com/JuliaLang/julia/issues/27746 [#27856]: https://github.com/JuliaLang/julia/issues/27856 [#27859]: https://github.com/JuliaLang/julia/issues/27859 [#27908]: https://github.com/JuliaLang/julia/issues/27908 [#27944]: https://github.com/JuliaLang/julia/issues/27944 [#28045]: https://github.com/JuliaLang/julia/issues/28045 [#28065]: https://github.com/JuliaLang/julia/issues/28065 [#28155]: https://github.com/JuliaLang/julia/issues/28155 [#28266]: https://github.com/JuliaLang/julia/issues/28266 [#28302]: https://github.com/JuliaLang/julia/issues/28302 Julia v0.6.0 Release Notes ========================== New language features --------------------- * New type system capabilities ([#8974], [#18457]) + Type parameter constraints can refer to previous parameters, e.g. `type Foo{R<:Real, A<:AbstractArray{R}}`. Can also be used in method definitions. + New syntax `Array{T} where T<:Integer`, indicating a union of types over all specified values of `T` (represented by a `UnionAll` type). This provides behavior similar to parametric methods or `typealias`, but can be used anywhere a type is accepted. This syntax can also be used in method definitions, e.g. `function inv(M::Matrix{T}) where T<:AbstractFloat`. Anonymous functions can have type parameters via the syntax `((x::Array{T}) where T<:Real) -> 2x`. + Implicit type parameters, e.g. `Vector{<:Real}` is equivalent to `Vector{T} where T<:Real`, and similarly for `Vector{>:Int}` ([#20414]). + Much more accurate subtype and type intersection algorithms. Method sorting and identification of equivalent and ambiguous methods are improved as a result. Language changes ---------------- * "Inner constructor" syntax for parametric types is deprecated. For example, in this definition: ``` type Foo{T,S<:Real} x Foo(x) = new(x) end ``` the syntax `Foo(x) = new(x)` actually defined a constructor for `Foo{T,S}`, i.e. the case where the type parameters are specified. For clarity, this definition now must be written as `Foo{T,S}(x) where {T,S<:Real} = new(x)` ([#11310], [#20308]). * The keywords used to define types have changed ([#19157], [#20418]). + `immutable` changes to `struct` + `type` changes to `mutable struct` + `abstract` changes to `abstract type ... end` + `bitstype 32 Char` changes to `primitive type Char 32 end` In 0.6, `immutable` and `type` are still allowed as synonyms without a deprecation warning. * Multi-line and single-line nonstandard command literals have been added. A nonstandard command literal is like a nonstandard string literal, but the syntax uses backquotes (``` ` ```) instead of double quotes, and the resulting macro called is suffixed with `_cmd`. For instance, the syntax ``` q`xyz` ``` is equivalent to `@q_cmd "xyz"` ([#18644]). * Nonstandard string and command literals can now be qualified with their module. For instance, `Base.r"x"` is now parsed as `Base.@r_str "x"`. Previously, this syntax parsed as an implicit multiplication ([#18690]). * For every binary operator `⨳`, `a .⨳ b` is now automatically equivalent to the `broadcast` call `(⨳).(a, b)`. Hence, one no longer defines methods for `.*` etcetera. This also means that "dot operations" automatically fuse into a single loop, along with other dot calls `f.(x)` ([#17623]). Similarly for unary operators ([#20249]). * Newly defined methods are no longer callable from the same dynamic runtime scope they were defined in ([#17057]). * `isa` is now parsed as an infix operator with the same precedence as `in` ([#19677]). * `@.` is now parsed as `@__dot__`, and can be used to add dots to every function call, operator, and assignment in an expression ([#20321]). * The identifier `_` can be assigned, but accessing its value is deprecated, allowing this syntax to be used in the future for discarding values ([#9343], [#18251], [#20328]). * The `typealias` keyword is deprecated, and should be replaced with `Vector{T} = Array{T,1}` or a `const` assignment ([#20500]). * Experimental feature: `x^n` for integer literals `n` (e.g. `x^3` or `x^-3`) is now lowered to `Base.literal_pow(^, x, Val{n})`, to enable compile-time specialization for literal integer exponents ([#20530], [#20889]). Breaking changes ---------------- This section lists changes that do not have deprecation warnings. * `readline`, `readlines` and `eachline` return lines without line endings by default. You *must* use `readline(s, chomp=false)`, etc. to get the old behavior where returned lines include trailing end-of-line character(s) ([#19944]). * `String`s no longer have a `.data` field (as part of a significant performance improvement). Use `Vector{UInt8}(str)` to access a string as a byte array. However, allocating the `Vector` object has overhead. You can also use `codeunit(str, i)` to access the `i`th byte of a `String`. Use `sizeof(str)` instead of `length(str.data)`, and `pointer(str)` instead of `pointer(str.data)` ([#19449]). * Operations between `Float16` and `Integers` now return `Float16` instead of `Float32` ([#17261]). * Keyword arguments are processed left-to-right: if the same keyword is specified more than once, the rightmost occurrence takes precedence ([#17785]). * The `lgamma(z)` function now uses a different (more standard) branch cut for `real(z) < 0`, which differs from `log(gamma(z))` by multiples of 2π in the imaginary part ([#18330]). * `broadcast` now handles tuples, and treats any argument that is not a tuple or an array as a "scalar" ([#16986]). * `broadcast` now produces a `BitArray` instead of `Array{Bool}` for functions yielding a boolean result. If you want `Array{Bool}`, use `broadcast!` or `.=` ([#17623]). * Broadcast `A[I...] .= X` with entirely scalar indices `I` is deprecated as its behavior will change in the future. Use `A[I...] = X` instead. * Operations like `.+` and `.*` on `Range` objects are now generic `broadcast` calls (see [above](#language-changes)) and produce an `Array`. If you want a `Range` result, use `+` and `*`, etcetera ([#17623]). * `broadcast` now treats `Ref` (except for `Ptr`) arguments as 0-dimensional arrays ([#18965]). * `broadcast` now handles missing data (`Nullable`s) allowing operations to be lifted over mixtures of `Nullable`s and scalars, as if the `Nullable` were like an array with zero or one element ([#16961], [#19787]). * The runtime now enforces when new method definitions can take effect ([#17057]). The flip-side of this is that new method definitions should now reliably actually take effect, and be called when evaluating new code ([#265]). * The array-scalar methods of `/`, `\`, `*`, `+`, and `-` now follow broadcast promotion rules. (Likewise for the now-deprecated array-scalar methods of `div`, `mod`, `rem`, `&`, `|`, and `xor`; see "Deprecated or removed" below.) ([#19692]). * `broadcast!(f, A)` now calls `f()` for each element of `A`, rather than doing `fill!(A, f())` ([#19722]). * `rmprocs` now throws an exception if requested workers have not been completely removed before `waitfor` seconds. With a `waitfor=0`, `rmprocs` returns immediately without waiting for worker exits. * `quadgk` has been moved from Base into a separate package ([#19741]). * The `Collections` module has been removed, and all functions defined therein have been moved to the `DataStructures` package ([#19800]). * The `RepString` type has been moved to the [LegacyStrings.jl package](https://github.com/JuliaArchive/LegacyStrings.jl). * In macro calls with parentheses, e.g. `@m(a=1)`, assignments are now parsed as `=` expressions, instead of as `kw` expressions ([#7669]). * When used as an infix operator, `~` is now parsed as a call to an ordinary operator with assignment precedence, instead of as a macro call ([#20406]). * (µ "micro" and ɛ "latin epsilon") are considered equivalent to the corresponding Greek characters in identifiers. `\varepsilon` now tab-completes to U+03B5 (greek small letter epsilon) ([#19464]). * `retry` now inputs the keyword arguments `delays` and `check` instead of `n` and `max_delay`. The previous functionality can be achieved setting `delays` to `ExponentialBackOff` ([#19331]). * `transpose(::AbstractVector)` now always returns a `RowVector` view of the input (which is a special 1×n-sized `AbstractMatrix`), not a `Matrix`, etc. In particular, for `v::AbstractVector` we now have `(v.').' === v` and `v.' * v` is a scalar ([#19670]). * Parametric types with "unspecified" parameters, such as `Array`, are now represented as `UnionAll` types instead of `DataType`s ([#18457]). * `Union` types have two fields, `a` and `b`, instead of a single `types` field. The empty type `Union{}` is represented by a singleton of type `TypeofBottom` ([#18457]). * The type `NTuple{N}` now refers to tuples where every element has the same type (since it is shorthand for `NTuple{N,T} where T`). To get the old behavior of matching any tuple, use `NTuple{N,Any}` ([#18457]). * `FloatRange` has been replaced by `StepRangeLen`, and the internal representation of `LinSpace` has changed. Aside from changes in the internal field names, this leads to several differences in behavior ([#18777]): + Both `StepRangeLen` and `LinSpace` can represent ranges of arbitrary object types---they are no longer limited to floating-point numbers. + For ranges that produce `Float64`, `Float32`, or `Float16` numbers, `StepRangeLen` can be used to produce values with little or no roundoff error due to internal arithmetic that is typically twice the precision of the output result. + To take advantage of this precision, `linspace(start, stop, len)` now returns a range of type `StepRangeLen` rather than `LinSpace` when `start` and `stop` are `FloatNN`. `LinSpace(start, stop, len)` always returns a `LinSpace`. + `StepRangeLen(a, step, len)` constructs an ordinary-precision range using the values and types of `a` and `step` as given, whereas `range(a, step, len)` will attempt to match inputs `a::FloatNN` and `step::FloatNN` to rationals and construct a `StepRangeLen` that internally uses twice-precision arithmetic. These two outcomes exhibit differences in both precision and speed. * `A=>B` expressions are now parsed as calls instead of using `=>` as the expression head ([#20327]). * The `count` function no longer sums non-boolean values ([#20404]) * The generic `getindex(::AbstractString, ::AbstractVector)` method's signature has been tightened to `getindex(::AbstractString, ::AbstractVector{<:Integer})`. Consequently, indexing into `AbstractString`s with non-`AbstractVector{<:Integer}` `AbstractVector`s now throws a `MethodError` in the absence of an appropriate specialization. (Previously such cases failed less explicitly with the exception of `AbstractVector{Bool}`, which now throws an `ArgumentError` noting that logical indexing into strings is not supported.) ([#20248]) * Bessel, Hankel, Airy, error, Dawson, eta, zeta, digamma, inverse digamma, trigamma, and polygamma special functions have been moved from Base to the [SpecialFunctions.jl package](https://github.com/JuliaMath/SpecialFunctions.jl) ([#20427]). Note that `airy`, `airyx` and `airyprime` have been deprecated in favor of more specific functions (`airyai`, `airybi`, `airyaiprime`, `airybiprimex`, `airyaix`, `airybix`, `airyaiprimex`, `airybiprimex`) ([#18050]). * When a macro is called in the module in which that macro is defined, global variables in the macro are now correctly resolved in the macro definition environment. Breakage from this change commonly manifests as undefined variable errors that do not occur under 0.5. Fixing such breakage typically requires sprinkling additional `esc`s in the offending macro ([#15850]). * `write` on an `IOBuffer` now returns a signed integer in order to be consistent with other buffers ([#20609]). * The `<:Integer` division fallback `/(::Integer, ::Integer)`, which formerly inappropriately took precedence over other division methods for some mixed-integer-type division calls, has been removed ([#19779]). * `@async`, `@spawn`, `@spawnat`, `@fetch` and `@fetchfrom` no longer implicitly localize variables. Previously, the expression would be wrapped in an implicit `let` block ([#19594]). * `parse` no longer accepts IPv4 addresses including leading zeros, octal, or hexadecimal. Convert IPv4 addresses including octal or hexadecimal to decimal, and remove leading zeros in decimal addresses ([#19811]). * Closures shipped for remote execution via `@spawn` or `remotecall` now automatically serialize globals defined under Main. For details, please refer to the paragraph on "Global variables" under the "Parallel computing" chapter in the manual ([#19594]). * `homedir` now determines the user's home directory via `libuv`'s `uv_os_homedir`, rather than from environment variables ([#19636]). * Workers now listen on an ephemeral port assigned by the OS. Previously workers would listen on the first free port available from 9009 ([#21818]). Library improvements -------------------- * A new `@views` macro was added to convert a whole expression or block of code to use views for all slices ([#20164]). * `max`, `min`, and related functions (`minmax`, `maximum`, `minimum`, `extrema`) now return `NaN` for `NaN` arguments ([#12563]). * `oneunit(x)` function to return a dimensionful version of `one(x)` (which is clarified to mean a dimensionless quantity if `x` is dimensionful) ([#20268]). * The `chop` and `chomp` functions now return a `SubString` ([#18339]). * Numbered stackframes printed in stacktraces can now be opened in an editor by entering the corresponding number in the REPL and pressing `^Q` ([#19680]). * The REPL now supports something called *prompt pasting* ([#17599]). This activates when pasting text that starts with `julia> ` into the REPL. In that case, only expressions starting with `julia> ` are parsed, the rest are removed. This makes it possible to paste a chunk of code that has been copied from a REPL session without having to scrub away prompts and outputs. This can be disabled or enabled at will with `Base.REPL.enable_promptpaste(::Bool)`. * The function `print_with_color` can now take a color represented by an integer between 0 and 255 inclusive as its first argument ([#18473]). For a number-to-color mapping, please refer to [this chart](https://upload.wikimedia.org/wikipedia/commons/1/15/Xterm_256color_chart.svg). It is also possible to use numbers as colors in environment variables that customizes colors in the REPL. For example, to get orange warning messages, simply set `ENV["JULIA_WARN_COLOR"] = 208`. Please note that not all terminals support 256 colors. * The function `print_with_color` no longer prints text in bold by default ([#18628]). Instead, the function now take a keyword argument `bold::Bool` which determines whether to print in bold or not. On some terminals, printing a color in non bold results in slightly darker colors being printed than when printing in bold. Therefore, light versions of the colors are now supported. For the available colors see the help entry on `print_with_color`. * The default text style for REPL input and answers has been changed from bold to normal ([#11250]). They can be changed back to bold by setting the environment variables `JULIA_INPUT_COLOR` and `JULIA_ANSWER_COLOR` to `"bold"`. For example, one way of doing this is adding `ENV["JULIA_INPUT_COLOR"] = :bold` and `ENV["JULIA_ANSWER_COLOR"] = :bold` to the `.juliarc.jl` file. See the [manual section on customizing colors](https://docs.julialang.org/en/v1/stdlib/REPL/#Customizing-Colors-1) for more information. * The default color for info messages has been changed from blue to cyan ([#18442]), and for warning messages from red to yellow ([#18453]). This can be changed back to the original colors by setting the environment variables `JULIA_INFO_COLOR` to `"blue"` and `JULIA_WARN_COLOR` to `"red"`. * Iteration utilities that wrap iterators and return other iterators (`enumerate`, `zip`, `rest`, `countfrom`, `take`, `drop`, `cycle`, `repeated`, `product`, `flatten`, `partition`) have been moved to the module `Base.Iterators` ([#18839]). * BitArrays can now be constructed from arbitrary iterables, in particular from generator expressions, e.g. `BitArray(isodd(x) for x = 1:100)` ([#19018]). * `hcat`, `vcat`, and `hvcat` now work with `UniformScaling` objects, so you can now do e.g. `[A I]` and it will concatenate an appropriately sized identity matrix ([#19305]). * New `accumulate` and `accumulate!` functions were added, which generalize `cumsum` and `cumprod`. Also known as a [scan](https://en.wikipedia.org/wiki/Prefix_sum) operation ([#18931]). * `reshape` now allows specifying one dimension with a `Colon()` (`:`) for the new shape, in which case that dimension's length will be computed such that its product with all the other dimensions is equal to the length of the original array ([#19919]). * The new `to_indices` function provides a uniform interface for index conversions, taking an array and a tuple of indices as arguments and returning a tuple of integers and/or arrays of supported scalar indices. It will throw an `ArgumentError` for any unsupported indices, and the returned arrays should be iterated over (and not indexed into) to support more efficient logical indexing ([#19730]). + Using colons (`:`) to represent a collection of indices is deprecated. They now must be explicitly converted to a specialized array of integers with the `to_indices` function.    As a result, the type of `SubArray`s that represent views over colon indices has changed. + Logical indexing is now more efficient. Logical arrays are converted by `to_indices` to a lazy, iterable collection of indices that doesn't support indexing. A deprecation provides indexing support with O(n) lookup. + The performance of indexing with `CartesianIndex`es is also improved in many situations. * A new `titlecase` function was added, to capitalize the first character of each word within a string ([#19469]). * `any` and `all` now always short-circuit, and `mapreduce` never short-circuits ([#19543]). That is, not every member of the input iterable will be visited if a `true` (in the case of `any`) or `false` (in the case of `all`) value is found, and `mapreduce` will visit all members of the iterable. * Additional methods for `ones` and `zeros` functions were added to support the same signature as the `similar` function ([#19635]). * `count` now has a `count(itr)` method equivalent to `count(identity, itr)` ([#20403]). * Methods for `map` and `filter` with `Nullable` arguments have been implemented; the semantics are as if the `Nullable` were a container with zero or one elements ([#16961]). * New `@test_warn` and `@test_nowarn` macros were added in the `Base.Test` module to test for the presence or absence of warning messages ([#19903]). * `logging` can now be used to redirect `info`, `warn`, and `error` messages either universally or on a per-module/function basis ([#16213]). * New function `Base.invokelatest(f, args...)` to call the latest version of a function in circumstances where an older version may be called instead (e.g. in a function calling `eval`) ([#19784]). * A new `iszero(x)` function was added, to quickly check whether `x` is zero (or is all zeros, for an array) ([#19950]). * `notify` now returns a count of tasks woken up ([#19841]). * A new nonstandard string literal `raw"..."` was added, for creating strings with no interpolation or unescaping ([#19900]). * A new `Dates.Time` type was added that supports representing the time of day with up to nanosecond resolution ([#12274]). * Raising one or negative one to a negative integer power formerly threw a `DomainError`. One raised to any negative integer power now yields one, negative one raised to any negative even integer power now yields one, and negative one raised to any negative odd integer power now yields negative one. Similarly, raising `true` to any negative integer power now yields `true` rather than throwing a `DomainError` ([#18342]). * A new `@macroexpand` macro was added as a convenient alternative to the `macroexpand` function ([#18660]). * `invoke` now supports keyword arguments ([#20345]). * A new `ConjArray` type was added, as a wrapper type for lazy complex conjugation of arrays. Currently, it is used by default for the new `RowVector` type only, and enforces that both `transpose(vec)` and `ctranspose(vec)` are views not copies ([#20047]). * `rem` now accepts a `RoundingMode` argument via `rem(x, y, r::RoundingMode)`, yielding `x - y*round(x/y, r)` without intermediate rounding. In particular, `rem(x, y, RoundNearest)` yields a value in the interval `[-abs(y)/2, abs(y)/2]`), which corresponds to the IEE754 `remainder` function. Similarly, `rem2pi(x, r::RoundingMode)` now exists as well, yielding `rem(x, 2pi, r::RoundingMode)` but with greater accuracy ([#10946]). * `map[!]` and `broadcast[!]` now have dedicated methods for sparse/structured vectors/matrices. Specifically, `map[!]` and `broadcast[!]` over combinations including one or more `SparseVector`, `SparseMatrixCSC`, `Diagonal`, `Bidiagonal`, `Tridiagonal`, or `SymTridiagonal`, and any number of `broadcast` scalars, `Vector`s, or `Matrix`s, now efficiently yield `SparseVector`s or `SparseMatrix`s as appropriate ([#19239], [#19371], [#19518], [#19438], [#19690], [#19724], [#19926], [#19934], [#20009]). * The operators `!` and `∘` (`\circ` at the REPL and in most code editors) now respectively perform predicate function negation and function composition. For example, `map(!iszero, (0, 1))` is now equivalent to `map(x -> !iszero(x), (0, 1))` and `map(uppercase ∘ hex, 250:255)` is now equivalent to `map(x -> uppercase(hex(x)), 250:255)` ([#17155]). * `enumerate` now supports the two-argument form `enumerate(::IndexStyle, iterable)`. This form allows specification of the returned indices' style. For example, `enumerate(IndexLinear, iterable)` yields linear indices and `enumerate(IndexCartesian, iterable)` yields cartesian indices ([#16378]). Compiler/Runtime improvements ----------------------------- * `ccall` is now implemented as a macro, removing the need for special code-generator support for `Intrinsics` ([#18754]). * `ccall` gained limited support for a `llvmcall` calling-convention. This can replace many uses of `llvmcall` with a simpler, shorter declaration ([#18754]). * All `Intrinsics` are now `Builtin` functions instead and have proper error checking and fall-back static compilation support ([#18754]). Deprecated or removed --------------------- * `ipermutedims(A::AbstractArray, p)` has been deprecated in favor of `permutedims(A, invperm(p))` ([#18891]). * Linear indexing is now only supported when there is exactly one non-cartesian index provided. Allowing a trailing index at dimension `d` to linearly access the higher dimensions from array `A` (beyond `size(A, d)`) has been deprecated as a stricter constraint during bounds checking. Instead, `reshape` the array such that its dimensionality matches the number of indices ([#20079]). * `Multimedia.@textmime "mime"` has been deprecated. Instead define `Multimedia.istextmime(::MIME"mime") = true` ([#18441]). * `isdefined(a::Array, i::Int)` has been deprecated in favor of `isassigned` ([#18346]). * The three-argument `SubArray` constructor (which accepts `dims::Tuple` as its third argument) has been deprecated in favor of the two-argument equivalent (the `dims::Tuple` argument being superfluous) ([#19259]). * `is` has been deprecated in favor of `===` (which used to be an alias for `is`) ([#17758]). * Ambiguous methods for addition and subtraction between `UniformScaling`s and `Number`s, for example `(+)(J::UniformScaling, x::Number)`, have been deprecated in favor of unambiguous, explicit equivalents, for example `J.λ + x` ([#17607]). * `num` and `den` have been deprecated in favor of `numerator` and `denominator` respectively ([#19233],[#19246]). * `delete!(ENV::EnvDict, k::AbstractString, def)` has been deprecated in favor of `pop!(ENV, k, def)`. Be aware that `pop!` returns `k` or `def`, whereas `delete!` returns `ENV` or `def` ([#18012]). * infix operator `$` has been deprecated in favor of infix `⊻` or function `xor` ([#18977]). * The single-argument form of `write` (`write(x)`, with implicit `STDOUT` output stream), has been deprecated in favor of the explicit equivalent `write(STDOUT, x)` ([#17654]). * `Dates.recur` has been deprecated in favor of `filter` ([#19288]) * A number of ambiguous `convert` operations between `Number`s (especially `Real`s) and `Date`, `DateTime`, and `Period` types have been deprecated in favor of unambiguous `convert` and explicit constructor calls. Additionally, ambiguous colon construction of `<:Period` ranges without step specification, for example `Dates.Hour(1):Dates.Hour(2)`, has been deprecated in favor of such construction including step specification, for example `Dates.Hour(1):Dates.Hour(1):Dates.Hour(2)` ([#19920]). * `cummin` and `cummax` have been deprecated in favor of `accumulate` ([#18931]). * The `Array` constructor syntax `Array(T, dims...)` has been deprecated in favor of the forms `Array{T,N}(dims...)` (where `N` is known, or particularly `Vector{T}(dims...)` for `N = 1` and `Matrix{T}(dims...)` for `N = 2`), and `Array{T}(dims...)` (where `N` is not known). Likewise for `SharedArray`s ([#19989]). * `sumabs` and `sumabs2` have been deprecated in favor of `sum(abs, x)` and `sum(abs2, x)`, respectively. `maxabs` and `minabs` have similarly been deprecated in favor of `maximum(abs, x)` and `minimum(abs, x)`. Likewise for the in-place counterparts of these functions ([#19598]). * The array-reducing form of `isinteger` (`isinteger(x::AbstractArray)`) has been deprecated in favor of `all(isinteger, x)` ([#19925]). * `produce`, `consume` and iteration over a Task object have been deprecated in favor of using Channels for inter-task communication ([#19841]). * The `negate` keyword has been deprecated from all functions in the `Dates` adjuster API (`adjust`, `tonext`, `toprev`, `Date`, `Time`, and `DateTime`). Instead use predicate function negation via the `!` operator (see [Library Improvements](#library-improvements)) ([#20213]). * `@test_approx_eq x y` has been deprecated in favor of `@test isapprox(x,y)` or `@test x ≈ y` ([#4615]). * `Matrix()` and `Matrix{T}()` have been deprecated in favor of the explicit forms `Matrix(0, 0)` and `Matrix{T}(0, 0)` ([#20330]). * Vectorized functions have been deprecated in favor of dot syntax ([#17302], [#17265], [#18558], [#19711], [#19712], [#19791], [#19802], [#19931], [#20543], [#20228]). * All methods of character predicates (`isalnum`, `isalpha`, `iscntrl`, `isdigit`, `isnumber`, `isgraph`, `islower`, `isprint`, `ispunct`, `isspace`, `isupper`, `isxdigit`) that accept `AbstractStrings` have been deprecated in favor of `all`. For example, `isnumber("123")` should now be expressed `all(isnumber, "123")` ([#20342]). * A few names related to indexing traits have been changed: `LinearIndexing` and `linearindexing` have been deprecated in favor of `IndexStyle`. `LinearFast` has been deprecated in favor of `IndexLinear`, and `LinearSlow` has been deprecated in favor of `IndexCartesian` ([#16378]). * The two-argument forms of `map` (`map!(f, A)`) and `asyncmap!` (`asyncmap!(f, A)`) have been deprecated in anticipation of future semantic changes ([#19721]). * `unsafe_wrap(String, ...)` has been deprecated in favor of `unsafe_string` ([#19449]). * `zeros` and `ones` methods accepting an element type as the first argument and an array as the second argument, for example `zeros(Float64, [1, 2, 3])`, have been deprecated in favor of equivalent methods with the second argument instead the size of the array, for example `zeros(Float64, size([1, 2, 3]))` ([#21183]). * `Base.promote_eltype_op` has been deprecated ([#19669], [#19814], [#19937]). * `isimag` has been deprecated ([#19949]). * The tuple-of-types form of `invoke`, `invoke(f, (types...), ...)`, has been deprecated in favor of the tuple-type form `invoke(f, Tuple{types...}, ...)` ([#18444]). * `Base._promote_array_type` has been deprecated ([#19766]). * `broadcast_zpreserving` has been deprecated ([#19533], [#19720]). * Methods allowing indexing of tuples by `AbstractArray`s with more than one dimension have been deprecated. (Indexing a tuple by such a higher-dimensional `AbstractArray` should yield a tuple with more than one dimension, but tuples are one-dimensional.) ([#19737]). * `@test_approx_eq a b` has been deprecated in favor of `@test a ≈ b` (or, equivalently, `@test ≈(a, b)` or `@test isapprox(a, b)`). `@test_approx_eq_eps` has been deprecated in favor of new `@test` syntax: `@test` now supports the syntax `@test f(args...) key=val ...` for `@test f(args..., key=val...)`. This syntax allows, for example, writing `@test a ≈ b atol=c` in place of `@test ≈(a, b, atol=c)` (and hence `@test_approx_eq_eps a b c`) ([#19901]). * `takebuf_array` has been deprecated in favor of `take!`, and `takebuf_string(x)` has been deprecated in favor of `String(take!(x))` ([#19088]). * `convert` methods from `Diagonal` and `Bidiagonal` to subtypes of `AbstractTriangular` have been deprecated ([#17723]). * `Base.LinAlg.arithtype` has been deprecated. If you were using `arithtype` within a `promote_op` call, instead use `promote_op(Base.LinAlg.matprod, Ts...)`. Otherwise, consider defining equivalent functionality locally ([#18218]). * Special characters (`#{}()[]<>|&*?~;`) should now be quoted in commands. For example, ``` `export FOO=1\;` ``` should replace ``` `export FOO=1;` ``` and ``` `cd $dir '&&' $thingie` ``` should replace ``` `cd $dir && $thingie` ``` ([#19786]). * Zero-argument `Channel` constructors (`Channel()`, `Channel{T}()`) have been deprecated in favor of equivalents accepting an explicit `Channel` size (`Channel(2)`, `Channel{T}(2)`) ([#18832]). * The zero-argument constructor `MersenneTwister()` has been deprecated in favor of the explicit `MersenneTwister(0)` ([#16984]). * `Base.promote_type(op::Type, Ts::Type...)` has been removed as part of an overhaul of `broadcast`'s promotion mechanism. If you need the functionality of that `Base.promote_type` method, consider defining it locally via `Core.Compiler.return_type(op, Tuple{Ts...})` ([#18642]). * `bitbroadcast` has been deprecated in favor of `broadcast`, which now produces a `BitArray` instead of `Array{Bool}` for functions yielding a boolean result ([#19771]). * To complete the deprecation of histogram-related functions, `midpoints` has been deprecated. Instead use the [StatsBase.jl package](https://github.com/JuliaStats/StatsBase.jl)'s `midpoints` function ([#20058]). * Passing a type argument to `LibGit2.cat` has been deprecated in favor of a simpler, two-argument method for `LibGit2.cat` ([#20435]). * The `LibGit2.owner` function for finding the repository which owns a given Git object has been deprecated in favor of `LibGit2.repository` ([#20135]). * The `LibGit2.GitAnyObject` type has been renamed to `LibGit2.GitUnknownObject` to clarify its intent ([#19935]). * The `LibGit2.GitOid` type has been renamed to `LibGit2.GitHash` for clarity ([#19878]). * Finalizing `LibGit2` objects with `finalize` has been deprecated in favor of using `close` ([#19660]). * Parsing string dates from a `Dates.DateFormat` object has been deprecated as part of a larger effort toward faster, more extensible date parsing ([#20952]). Command-line option changes --------------------------- * In `polly` builds (`USE_POLLY := 1`), the new flag `--polly={yes|no}` controls whether `@polly` declarations are respected. (With `--polly=no`, `@polly` declarations are ignored.) This flag is also available in non-`polly` builds (`USE_POLLY := 0`), but has no effect ([#18159]). Julia v0.5.0 Release Notes ========================== New language features --------------------- * Generator expressions: `f(i) for i in 1:n` ([#4470]). This returns an iterator that computes the specified values on demand. This is useful for computing, e.g. `sum(f(i) for i in 1:n)` without creating an intermediate array of values. * Generators and comprehensions support filtering using `if` ([#550]) and nested iteration using multiple `for` keywords ([#4867]). * Fused broadcasting syntax: ``f.(args...)`` is equivalent to ``broadcast(f, args...)`` ([#15032]), and nested `f.(g.(args...))` calls are fused into a single `broadcast` loop ([#17300]). Similarly, the syntax `x .= ...` is equivalent to a `broadcast!(identity, x, ...)` call and fuses with nested "dot" calls; also, `x .+= y` and similar is now equivalent to `x .= x .+ y`, rather than `x = x .+ y` ([#17510]). * Macro expander functions are now generic, so macros can have multiple definitions (e.g. for different numbers of arguments, or optional arguments) ([#8846], [#9627]). However note that the argument types refer to the syntax tree representation, and not to the types of run time values. * Varargs functions like `foo{T}(x::T...)` may now restrict the number of such arguments using `foo{T,N}(x::Vararg{T,N})` ([#11242]). * `x ∈ X` is now a synonym for `x in X` in `for` loops and comprehensions, as it already was in comparisons ([#13824]). * The `PROGRAM_FILE` global is now available for determining the name of the running script ([#14114]). * The syntax `x.:sym` (e.g. `Base.:+`) is now supported, while using `x.(:sym)` or `x.(i)` for field access are deprecated in favor of `getfield` ([#15032]). * Function return type syntax `function f()::T` has been added ([#1090]). Values returned from a function with such a declaration will be converted to the specified type `T`. * Many more operators now support `.` prefixes (e.g. `.≤`) ([#17393]). However, users are discouraged from overloading these, since they are mainly parsed in order to implement backwards compatibility with planned automatic broadcasting of dot operators in Julia 0.6 ([#16285]). Explicitly qualified operator names like `Base.≤` should now use `Base.:≤` (prefixed by `@compat` if you need 0.4 compatibility via the `Compat` package). * User-extensible bounds check elimination is now possible with the new `@boundscheck` macro ([#14474]). This macro marks bounds checking code blocks, which the compiler may remove when encountered inside an `@inbounds` call. Experimental language features ------------------------------ * Support for [multi-threading](https://docs.julialang.org/en/v1/manual/parallel-computing/#man-multithreading-1). Loops with independent iterations can be easily parallelized with the `Threads.@threads` macro. * Support for arrays with indexing starting at values different from 1. The array types are expected to be defined in packages, but now Julia provides an API for writing generic algorithms for arbitrary indexing schemes ([#16260]). Language changes ---------------- * Each function and closure now has its own type. The captured variables of a closure are fields of its type. `Function` is now an abstract type, and is the default supertype of functions and closures. All functions, including anonymous functions, are generic and support all features (e.g. keyword arguments). Instead of adding methods to `call`, methods are added by type using the syntax `(::ftype)(...) = ...`. `call` is deprecated ([#13412]). A significant result of this language change is that higher order functions can be specialized on their function arguments, leading to much faster functional programming, typically as fast as if function arguments were manually inlined. See below for details. * Square brackets and commas (e.g. `[x, y]`) no longer concatenate arrays, and always simply construct a vector of the provided values. If `x` and `y` are arrays, `[x, y]` will be an array of arrays ([#3737], [#2488], [#8599]). * `using` and `import` are now case-sensitive even on case-insensitive filesystems (common on Mac and Windows) ([#13542]). * Relational algebra symbols are now allowed as infix operators ([#8036]): `⨝`, `⟕`, `⟖`, `⟗` for joins and `▷` for anti-join. * A warning is always given when a method is overwritten; previously, this was done only when the new and old definitions were in separate modules ([#14759]). * The `if` keyword cannot be followed immediately by a line break ([#15763]). * Juxtaposition of numeric literals ending in `.` (e.g. `1.x`) is no longer allowed ([#15731]). * The built-in `NTuple` type has been removed; `NTuple{N,T}` is now implemented internally as `Tuple{Vararg{T,N}}` ([#11242]). * Use of the syntax `x::T` to declare the type of a local variable is deprecated. In the future this will always mean type assertion, and declarations should use `local x::T` instead ([#16071]). When `x` is global, `x::T = ...` and `global x::T` used to mean type assertion, but this syntax is now reserved for type declaration ([#964]). * Dictionary comprehension syntax `[ a=>b for x in y ]` is deprecated. Use `Dict(a=>b for x in y)` instead ([#16510]). * Parentheses are no longer allowed around iteration specifications, e.g. `for (i = 1:n)` ([#17668]). Breaking changes ---------------- This section lists changes that do not have deprecation warnings. * All dimensions indexed by scalars are now dropped, whereas previously only trailing scalar dimensions would be omitted from the result ([#13612]). This is a very major behavioral change, but should cause obvious failures. To retain a dimension sliced with a scalar `i` slice with `i:i` instead. * The assignment operations `.+=`, `.*=` and so on now generate calls to `broadcast!` on the left-hand side (or call to `view(a, ...)` on the left-hand side if the latter is an indexing expression, e.g. `a[...]`). This means that they will fail if the left-hand side is immutable (or does not support `view`), and will otherwise change the left-hand side in-place ([#17510], [#17546]). * Method ambiguities no longer generate warnings when files are loaded, nor do they dispatch to an arbitrarily-chosen method; instead, a call that cannot be resolved to a single method results in a `MethodError` at run time, rather than the previous definition-time warning ([#6190]). * Array comprehensions preserve the dimensions of the input ranges. For example, `[2x for x in A]` will have the same dimensions as `A` ([#16622]). * The result type of an array comprehension depends only on the types of elements computed, instead of using type inference ([#7258]). If the result is empty, then type inference is still used to determine the element type. * `reshape` is now defined to always share data with the original array. If a reshaped copy is needed, use `copy(reshape(a))` or `copy!` to a new array of the desired shape ([#4211]). * `mapslices` now re-uses temporary storage. Recipient functions that expect input slices to be persistent should copy data to other storage ([#17266]). All usages of `mapslices` should be carefully audited since this change can cause silent, incorrect behavior, rather than failing noisily. * Local variables and arguments are represented in lowered code as numbered `Slot` objects instead of as symbols ([#15609]). * The information that used to be in the `ast` field of the `LambdaStaticData` type is now divided among the fields `code`, `slotnames`, `slottypes`, `slotflags`, `gensymtypes`, `rettype`, `nargs`, and `isva` in the `LambdaInfo` type ([#15609]). * `A <: B` is parsed as `Expr(:(<:), :A, :B)` in all cases ([#9503]). This also applies to the `>:` operator. * Simple 2-argument comparisons like `A < B` are parsed as calls instead of using the `:comparison` expression type ([#15524]). The `:comparison` expression type is still produced in ASTs when comparisons are chained (e.g. `A < B ≤ C`). * `map` on a dictionary now expects a function that expects and returns a `Pair`. The result is now another dictionary instead of an array ([#16622]). * Bit shift operations (i.e. `<<`, `>>`, and `>>>`) now handle negative shift counts differently: Negative counts are interpreted as shifts in the opposite direction. For example, `4 >> -1 == 4 << +1 == 8`. Previously, negative counts would implicitly overflow to large positive counts, always yielding either `0` or `-1`. Library improvements -------------------- * Strings ([#16107]): * The `UTF8String` and `ASCIIString` types have been merged into a single `String` type ([#16058]). Use `isascii(s)` to check whether a string contains only ASCII characters. The `ascii(s)` function now converts `s` to `String`, raising an `ArgumentError` exception if `s` is not pure ASCII. * The `UTF16String` and `UTF32String` types and corresponding `utf16` and `utf32` converter functions have been removed from the standard library. If you need these types, they have been moved to the [LegacyStrings.jl package](https://github.com/JuliaArchive/LegacyStrings.jl). In the future, more robust Unicode string support will be provided by the [StringEncodings.jl package](https://github.com/nalimilan/StringEncodings.jl). If you only need these types to call wide string APIs (UTF-16 on Windows, UTF-32 on UNIX), consider using the new `transcode` function (see below) or the `Cwstring` type as a `ccall` argument type, which also ensures correct NUL termination of string data. * A `transcode(T, src)` function is now exported for converting data between UTF-xx Unicode encodings ([#17323]). * The basic string construction routines are now `string(args...)`, `String(s)`, `unsafe_string(ptr)` (formerly `bytestring(ptr)`), and `unsafe_wrap(String, ptr)` (formerly `pointer_to_string`) ([#16731]). * Comparisons between `Char`s and `Integer`s are now deprecated ([#16024]): `'x' == 120` now produces a warning but still evaluates to `true`. In the future it may evaluate to `false` or the comparison may be an error. To compare characters with integers you should either convert the integer to a character value or convert the character to the corresponding code point first: e.g. `'x' == Char(120)` or `Int('x') == 120`. The former is usually preferable. * Support for Unicode 9 ([#17402]). * Arrays and linear algebra: * Dimensions indexed by multidimensional arrays add dimensions. More generally, the dimensionality of the result is the sum of the dimensionalities of the indices ([#15431]). * New `normalize` and `normalize!` convenience functions for normalizing vectors ([#13681]). * QR matrix factorization: * New method for generic QR with column pivoting ([#13480]). * New method for polar decompositions of `AbstractVector`s ([#13681]). * A new `SparseVector` type allows for one-dimensional sparse arrays. Slicing and reshaping sparse matrices now return vectors when appropriate. The `sparsevec` function returns a one-dimensional sparse vector instead of a one-column sparse matrix. The `SparseMatrix` module has been renamed to `SparseArrays` ([#13440]). * Rank one update and downdate functions, `lowrankupdate`, `lowrankupdate!`, `lowrankdowndate`, and `lowrankdowndate!`, have been introduced for dense Cholesky factorizations ([#14243], [#14424]). * All `sparse` methods now retain provided numerical zeros as structural nonzeros; to drop numerical zeros, use `dropzeros!` ([#14798], [#15242]). * `setindex!` methods for sparse matrices and vectors no longer purge allocated entries on zero assignment. To drop stored entries from sparse matrices and vectors, use `Base.SparseArrays.dropstored!` ([#17404]). * Concatenating dense and sparse matrices now returns a sparse matrix ([#15172]). * Files and I/O: * The `open` function now respects `umask` on UNIX when creating files ([#16466], [#16502]). * A new function `walkdir()` returns an iterator that walks the tree of a directory ([#8814], [#13707]). ``` for (root, dirs, files) in walkdir(expanduser("~/.julia/v0.5/Plots/src")) println("$(length(files)) \t files in $root") end 19 files in /Users/me/.julia/v0.5/Plots/src 15 files in /Users/me/.julia/v0.5/Plots/src/backends 4 files in /Users/me/.julia/v0.5/Plots/src/deprecated ``` * A new function `chown()` changes the ownership of files ([#15007]). * Display properties can now be passed among output functions (e.g. `show`) using an `IOContext` object ([#13825]). * `Cmd(cmd; ...)` now accepts new Windows-specific options `windows_verbatim` (to alter Windows command-line generation) and `windows_hide` (to suppress creation of new console windows) ([#13780]). * There is now a default no-op `flush(io)` function for all `IO` types ([#16403]). * Parallel computing: * `pmap` keyword arguments `err_retry=true` and `err_stop=false` are deprecated. Action to be taken on errors can be specified via the `on_error` keyword argument. Retry is specified via `retry_n`, `retry_on` and `retry_max_delay` ([#15409], [#15975], [#16663]). * The functions `remotecall`, `remotecall_fetch`, and `remotecall_wait` now have the function argument as the first argument to allow for do-block syntax ([#13338]). * Statistics: * Improve performance of `quantile` ([#14413]). * `extrema` can now operate over a region ([#15550]). * `cov` and `cor` don't use keyword arguments anymore and are therefore now type stable ([#13465]). * Histogram functionality has been deprecated in `Base`. Use the [StatsBase.jl package](https://github.com/JuliaStats/StatsBase.jl) instead ([#6842], [#16450]). * Testing: * The `Base.Test` module now has a `@testset` feature to bundle tests together and delay throwing an error until the end ([#13062]). * The new features are mirrored in the [BaseTestNext.jl package](https://github.com/IainNZ/BaseTestNext.jl) for users who would like to use the new functionality on Julia v0.4. * The [BaseTestDeprecated.jl package](https://github.com/IainNZ/BaseTestDeprecated.jl) provides the old-style `handler` functionality, for compatibility with code that needs to support both Julia v0.4 and v0.5. * Package management: * The package system (`Pkg`) is now based on the `libgit2` library, rather than running the `git` program, increasing performance (especially on Windows) ([#11196]). * Package-development functions like `Pkg.tag` and `Pkg.publish` have been moved to an external [PkgDev] package ([#13387]). * Updating only a subset of the packages is now supported, e.g. `Pkg.update("Example")` ([#17132]). * Miscellaneous: * Prime number related functions have been moved from `Base` to the [Primes.jl package](https://github.com/JuliaMath/Primes.jl) ([#16481]). * Most of the combinatorics functions have been moved from `Base` to the [Combinatorics.jl package](https://github.com/JuliaLang/Combinatorics.jl) ([#13897]). * New `foreach` function for calling a function on every element of a collection when the results are not needed ([#13774]). Compared to `map(f, v)`, which allocates and returns a result array, `foreach(f, v)` calls `f` on each element of `v`, returning nothing. * The new `Base.StackTraces` module makes stack traces easier to use programmatically ([#14469]). * The `libjulia` library is now properly versioned and installed to the public `/lib` directory, instead of the private `/lib/julia` directory ([#16362]). * System reflection is now more consistently exposed from `Sys` and not `Base` (e.g. constants such as `WORD_SIZE` and `CPU_CORES`). `OS_NAME` has been replaced by `Sys.KERNEL` and always reports the name of the kernel (as reported by `uname`). The `@windows_only` and `@osx` family of macros have been replaced with functions such as `is_windows()` and `is_apple()`. There is now also a `@static` macro that will evaluate the condition of an if-statement at compile time, for when a static branch is required ([#16219]). * `Date` and `DateTime` values can now be rounded to a specified resolution (e.g., 1 month or 15 minutes) with `floor`, `ceil`, and `round` ([#17037]). [PkgDev]: https://github.com/JuliaLang/PkgDev.jl Compiler/Runtime improvements ----------------------------- * Machine SIMD types can be represented in Julia as a homogeneous tuple of `VecElement` ([#15244]). * The performance of higher-order and anonymous functions has been greatly improved. For example, `map(x->2x, A)` performs as well as `2.*A`([#13412]). * On windows, a DLL of standard library code is now precompiled and used by default, improving startup time ([#16953]). * LLVM has been upgraded to version 3.7.1, improving the quality of generated code and debug info. However compile times may be slightly longer ([#14623]). New architectures ----------------- This release greatly improves support for ARM, and introduces support for Power. * [ARM](https://github.com/JuliaLang/julia/issues?utf8=%E2%9C%93&q=label%3Aarm): [#14194], [#14519], [#16645], [#16621] * [Power](https://github.com/JuliaLang/julia/issues?utf8=%E2%9C%93&q=label%3Apower): [#16455], [#16404] Deprecated or removed --------------------- * The following function names have been simplified and unified ([#13232]): * `get_bigfloat_precision` -> `precision(BigFloat)` * `set_bigfloat_precision` -> `setprecision` * `with_bigfloat_precision` -> `setprecision` * `get_rounding` -> `rounding` * `set_rounding` -> `setrounding` * `with_rounding` -> `setrounding` * The method `A_ldiv_B!(SparseMatrixCSC, StridedVecOrMat)` has been deprecated in favor of versions that require the matrix to be in factored form ([#13496]). * `chol(A,Val{:U/:L})` has been deprecated in favor of `chol(A)` ([#13680]). * `rem1(x,y)` is discontinued due to inconsistency for `x==0`. Use `mod1` instead ([#14140]). * The `FS` module has been renamed to `Filesystem`. Calling the functions `isreadable`, `iswritable`, and `isexecutable` on filesystem paths has been deprecated ([#12819]). * `RemoteRef` has been deprecated in favor of `RemoteChannel` ([#14458]). * `super` has been renamed to `supertype` ([#14335]). * `parseip(str)` has been deprecated in favor of `parse(IPAddr, str)` ([#14676]). * `readall` has been renamed to `readstring`, and `readbytes` has been renamed to `read` ([#14608], [#14660]). * `fieldoffsets(x)` has been deprecated in favor of calling `fieldoffset(x, i)` on each field ([#14777]). * `issym` is deprecated in favor of `issymmetric` to match similar functions (`ishermitian`, ...) ([#15192]). * `scale` is deprecated in favor of either `α*A`, `Diagonal(x)*A`, or `A*Diagonal(x)` ([#15258]). * `istext` has been renamed to `istextmime` ([#12872], [#15708]). * "Functor" types are no longer necessary and have been deprecated ([#15804]). To maintain performance on older versions of Julia the [Compat.jl package](https://github.com/JuliaLang/Compat.jl/pull/184) provides a `@functorize` macro. * `bitunpack(B)` and `bitpack(A)` have been deprecated in favor of `Array(B)` and `BitArray(A)`, respectively ([#16010]). * `xdump` is removed, and `dump` now simply shows the full representation of a value. `dump` should not be overloaded, since it is for examining concrete structure ([#4163]). * `sprandbool` has been deprecated in favor of `sprand(Bool, ...)` or `sprand(rng, Bool, ...)` ([#11688], [#16098]). * The lowercase `symbol` function has been deprecated in favor of the `Symbol` constructor ([#16154]). * `writemime` is deprecated, and output methods specifying a MIME type are now methods of `show` ([#14052]). * BLAS utility functions `blas_set_num_threads`, `blas_vendor`, and `check_blas` have been moved to the BLAS module as `BLAS.set_num_threads`, `BLAS.vendor`, and `BLAS.check` ([#10548], [#16600]). * `print_escaped` has been renamed to `escape_string`, `print_unescaped` has been renamed to `unescape_string`, and `print_joined` has been renamed to `join` ([#16603]). * `pointer_to_string` has been renamed to `unsafe_wrap(String, ...)`, and `pointer_to_array` has been renamed to `unsafe_wrap(Array, ...)` ([#16731]). * `sub` and `slice` have been deprecated in favor of `view` ([#16972]). * Sparse matrix functions `etree`, `ereach`, `csc_permute`, and `symperm` have been moved to the [SuiteSparse.jl package](https://github.com/JuliaSparse/SuiteSparse.jl) ([#12231], [#17033]). * The no-op `transpose` fallback for non-numeric arrays has been deprecated. Consider introducing suitable `transpose` methods or calling `permutedims(x, (2, 1))` for matrices and `reshape(x, 1, length(x))` for vectors. ([#13171], [#17075], [#17374]). * The following macros have been deprecated ([#16219]): * `@windows` is deprecated in favor of `is_windows()` * `@unix` is deprecated in favor of `is_unix()` * `@osx` is deprecated in favor of `is_apple()` * `@linux` is deprecated in favor of `is_linux()` * `@windows_only` is deprecated in favor of `if is_windows()` * `@unix_only` is deprecated in favor of `if is_unix()` * `@osx_only` is deprecated in favor of `if is_apple()` * `@linux_only` is deprecated in favor of `if is_linux()` * NOTE: Using `@static` could be useful/necessary when used in a function's local scope. See details at the section entitled [Handling Operating System Variation](https://docs.julialang.org/en/v1/manual/handling-operating-system-variation/) in the manual. Command-line option changes --------------------------- * The `-F` flag to load `~/.juliarc` has been deprecated in favor of `--startup-file=yes` ([#9482]). * The `-f` and `--no-startup` flags to disable loading of `~/.juliarc` have been deprecated in favor of `--startup-file=no` ([#9482]). * The `-P` and `--post-boot` flags for evaluating an expression in "interactive mode" have been deprecated in favor of `-i -e` ([#16854]). * The `--no-history-file` flag to disable loading of `~/.julia_history` has been deprecated in favor of `--history-file=no` ([#9482]). Language tooling improvements ----------------------------- * The [Julia debugger](https://github.com/Keno/Gallium.jl) makes its debut with this release. Install it with `Pkg.add("Gallium")`, and the [documentation](https://github.com/Keno/Gallium.jl#gallium) should get you going. The [JuliaCon talk](https://www.youtube.com/watch?v=e6-hcOHO0tc&list=PLP8iPy9hna6SQPwZUDtAM59-wPzCPyD_S&index=5) on Gallium shows off various features of the debugger. * The [Juno IDE](http://junolab.org) has matured significantly, and now also includes support for plotting and debugging. * [Cxx.jl](https://github.com/Keno/Cxx.jl) provides a convenient FFI for calling C++ code from Julia. Julia v0.4.0 Release Notes ========================== New language features --------------------- * Function call overloading: for arbitrary objects `x` (not of type `Function`), `x(...)` is transformed into `call(x, ...)`, and `call` can be overloaded as desired. Constructors are now a special case of this mechanism, which allows e.g. constructors for abstract types. `T(...)` falls back to `convert(T, x)`, so all `convert` methods implicitly define a constructor ([#8712], [#2403]). * Unicode version 8 is now supported for identifiers etcetera ([#7917], [#12031]). * Type parameters now permit any `isbits` type, not just `Int` and `Bool` ([#6081]). * Keyword argument names can be computed, using syntax such as `f(; symbol => val)` ([#7704]). * The syntax `@generated function` enables generation of specialized methods based on argument types. At compile time, the function is called with its arguments bound to their types instead of to their values. The function then returns an expression forming the body of the function to be called at run time ([#7311]). * [Documentation system](https://docs.julialang.org/en/v1/manual/documentation/) for functions, methods, types and macros in packages and user code ([#8791]). * The syntax `function foo end` can be used to introduce a generic function without yet adding any methods ([#8283]). * Incremental precompilation of modules: call `VERSION >= v"0.4.0-dev+6521" && __precompile__()` at the top of a module file to automatically precompile it when it is imported ([#12491]), or manually run `Base.compilecache(modulename)`. The resulting precompiled `.ji` file is saved in `~/.julia/lib/v0.4` ([#8745]). * See manual section on `Module initialization and precompilation` (under `Modules`) for details and errata. In particular, to be safely precompilable a module may need an `__init__` function to separate code that must be executed at runtime rather than precompile time. Modules that are *not* precompilable should call `__precompile__(false)`. * The precompiled `.ji` file includes a list of dependencies (modules and files that were imported/included at precompile-time), and the module is automatically recompiled upon `import` when any of its dependencies have changed. Explicit dependencies on other files can be declared with `include_dependency(path)` ([#12458]). * New option `--output-incremental={yes|no}` added to invoke the equivalent of `Base.compilecache` from the command line. * The syntax `new{parameters...}(...)` can be used in constructors to specify parameters for the type to be constructed ([#8135]). * `++` is now parsed as an infix operator, but does not yet have a default definition ([#11030], [#11686]). * Support for inter-task communication using `Channels` ([#12264]). See https://docs.julialang.org/en/v1/manual/parallel-computing/#Channels-1 for details. * `RemoteRef`s now point to remote channels. The remote channels can be of length greater than 1. Default continues to be of length 1 ([#12385]). See https://docs.julialang.org/en/v1/manual/parallel-computing/#Remote-References-and-AbstractChannels-1 for details. * `@__LINE__` special macro now available to reflect invocation source line number ([#12727]). Language changes ---------------- * Tuple types are now written as `Tuple{A, B}` instead of as `(A, B)`. Tuples of bits types are inlined into structs and arrays, like other immutable types. `...` now does splatting inside parentheses, instead of constructing a variadic tuple type ([#10380]). Variadic tuple types are written as `Tuple{Vararg{T}}`. * Using `[x,y]` to concatenate arrays is deprecated, and in the future will construct a vector of `x` and `y` instead ([#3737], [#2488], [#8599]). * Significant improvements to `ccall` and `cfunction` * As a safer alternative to creating pointers (`Ptr`), the managed reference type `Ref` has been added. A `Ref` points to the data contained by a value in an abstract sense, and in a way that is GC-safe. For example, `Ref(2)` points to a storage location that contains the integer `2`, and `Ref(array,3)` points to the third element of an array. A `Ref` can be automatically converted to a native pointer when passed to a `ccall`. * When passing a by-reference argument to `ccall`, you can declare the argument type to be `Ref{T}` instead of `Ptr{T}`, and just pass `x` instead of `&x`. * `ccall` is now lowered to call `unsafe_convert(T, cconvert(T, x))` on each argument. `cconvert` falls back to `convert`, but can be used to convert an argument to an arbitrarily-different representation more suitable for passing to C. `unsafe_convert` then handles conversions to `Ptr`. * `ccall` and `cfunction` now support correctly passing and returning structs, following the platform ABI (assuming the C types are mirrored accurately in Julia). * `cfunction` arguments of struct-like Julia types are now passed by value. If `Ref{T}` is used as a `cfunction` argument type, it will look up the method applicable to `T`, but pass the argument by reference (as Julia functions usually do). However, this should only be used for objects allocated by Julia and for `isbits` types. * `convert(Ptr,x)` is deprecated for most types, replaced by `unsafe_convert`. You can still `convert` between pointer types, and between pointers and `Int` or `UInt`. * Module `__init__` methods no longer swallow thrown exceptions; they now throw an `InitError` wrapping the thrown exception ([#12576]). * Unsigned `BigInt` literal syntax has been removed ([#11105]). Unsigned literals larger than `UInt128` now throw a syntax error. * `error(::Exception)` and `error(::Type{Exception})` have been deprecated in favor of using an explicit `throw` ([#9690]). * `Uint` etcetera are renamed to `UInt` ([#8905]). * `String` is renamed to `AbstractString` ([#8872]). * `FloatingPoint` is renamed to `AbstractFloat` ([#12162]). * `None` is deprecated; use `Union{}` instead ([#8423]). * `Nothing` (the type of `nothing`) is renamed to `Void` ([#8423]). * Arrays can be constructed with the syntax `Array{T}(m,n)` ([#3214], [#10075]). * `Dict` literal syntax `[a=>b,c=>d]` is replaced by `Dict(a=>b,c=>d)`, `{a=>b}` is replaced by `Dict{Any,Any}(a=>b)`, and `(K=>V)[...]` is replaced by `Dict{K,V}(...)`. The new syntax has many advantages: all of its components are first-class, it generalizes to other types of containers, it is easier to guess how to specify key and value types, and the syntaxes for empty and pre-populated dicts are synchronized. As part of this change, `=>` is parsed as a normal operator, and `Base` defines it to construct `Pair` objects ([#6739]). * `Char` is no longer a subtype of `Integer` ([#8816]). Char now supports a more limited set of operations with `Integer` types: * comparison / equality * `Char` + `Int` = `Char` * `Char` - `Char` = `Int` * `round` rounds to the nearest integer using the default rounding mode, which is ties-to-even by default ([#8750]). * A custom triple-quoted string like `x"""..."""` no longer invokes an `x_mstr` macro. Instead, the string is first unindented and then `x_str` is invoked, as if the string had been single-quoted ([#10228]). * Colons (`:`) within indexing expressions are no longer lowered to the range `1:end`. Instead, the `:` identifier is passed directly. Custom array types that implement `getindex` or `setindex!` methods must also extend those methods to support arguments of type `Colon` ([#10331]). * Unions of types should now be written with curly braces instead of parentheses, i.e. `Union{Type1, Type2}` instead of `Union(Type1, Type2)` ([#11432]). * The keyword `local` is no longer allowed in global scope. Use `let` instead of `begin` to create a new scope from the top level ([#7234], [#10472]). * Triple-quoted strings no longer treat tabs as 8 spaces. Instead, the longest common prefix of spaces and tabs is removed. * `global x` in a nested scope is now a syntax error if `x` is local to the enclosing scope ([#7264]/[#11985]). * The default `importall Base.Operators` is deprecated, and relying on it will give a warning ([#8113]). * `remotecall_fetch` and `fetch` now rethrow any uncaught remote exception locally as a `RemoteException`. Previously they would return the remote exception object. The worker pid, remote exception and remote backtrace are available in the thrown `RemoteException`. * If any of the enclosed async operations in a `@sync` block throw exceptions, they are now collected in a `CompositeException` and the `CompositeException` thrown. Command line option changes --------------------------- * The `-i` option now forces the REPL to run after loading the specified script (if any) ([#11347]). * New option `--handle-signals={yes|no}` to disable Julia's signal handlers. * The `--depwarn={yes|no|error}` option enables/disables syntax and method deprecation warnings, or turns them into errors ([#9294]). * Some command line options are slated for deprecation / removal - `-f, --no-startup` Don't load ~/.juliarc (deprecated, use --startup-file=no) - `-F` Load ~/.juliarc (deprecated, use --startup-file=yes)` - `-P, --post-boot ` Evaluate , but don't disable interactive mode (deprecated, use -i -e instead) - `--no-history-file` Don't load history file (deprecated, use --history-file=no) Compiler/Runtime improvements ----------------------------- * Functions may be annotated with metadata (`:meta` expressions) to be used by the compiler ([#8297]). * `@inline` before a function definition forces the compiler to inline the function ([#8297]). * Loads from heap-allocated immutables are hoisted out of loops in more cases ([#8867]). * Accessing fields that are always initialized no longer produces undefined checks ([#8827]). * New generational garbage collector which greatly reduces GC overhead for many common workloads ([#5227]). Library improvements -------------------- * Build with USE_GPL_LIBS=0 to exclude all GPL libraries and code ([#10870]). * Linear algebra * The `LinAlg` module is now exported. * `sparse(A)` now takes any `AbstractMatrix` A as an argument ([#10031]). * Factorization API is now type-stable; functions dispatch on `Val{false}` or `Val{true}` instead of a boolean value ([#9575]). * Added generic Cholesky factorization, and the Cholesky factorization is now parametrized by the matrix type ([#7236]). * Sparse `cholfact` and `ldltfact` functions now accept a `perm` keyword for user-provided permutations and a `shift` keyword to factorize a shifted matrix ([#10844]). * New `svds` function for the sparse truncated SVD ([#9425]). * `Symmetric` and `Hermitian` immutables are now parametrized by the matrix type ([#7992]). * New `ordschur` and `ordschur!` functions for sorting a Schur factorization by the eigenvalues ([#8467],[#9701]). * `Givens` type doesn't have a size anymore and is no longer a subtype of `AbstractMatrix` ([#8660]). * Large speedup in sparse `\` and splitting of Cholesky and LDLᵀ factorizations into `cholfact` and `ldltfact` ([#10117]). * Add sparse least squares to `\` by adding `qrfact` for sparse matrices based on the SPQR library ([#10180]). * Split `Triangular` type into `UpperTriangular`, `LowerTriangular`, `UnitUpperTriagular` and `UnitLowerTriangular` ([#9779]) * OpenBLAS 64-bit (ILP64) interface is now compiled with a `64_` suffix ([#8734]) to avoid conflicts with external libraries using a 32-bit BLAS ([#4923]). * New `vecdot` function, analogous to `vecnorm`, for Euclidean inner products over any iterable container ([#11067]). * `p = plan_fft(x)` and similar functions now return a `Base.DFT.Plan` object, rather than an anonymous function. Calling it via `p(x)` is deprecated in favor of `p * x` or `p \ x` (for the inverse), and it can also be used with `A_mul_B!` to employ pre-allocated output arrays ([#12087]). * `LU{T,Tridiagonal{T}}` now supports extraction of `L`, `U`, `p`, and `P` factors ([#12137]). * Allocations in sparse matrix factorizations are now tracked by Julia's garbage collector ([#12034]). * Strings * NUL-terminated strings should now be passed to C via the new `Cstring` type, not `Ptr{UInt8}` or `Ptr{Cchar}`, in order to check whether the string is free of NUL characters (which would cause silent truncation in C). The analogous type `Cwstring` should be used for NUL-terminated `wchar_t*` strings ([#10994]). * `graphemes(s)` returns an iterator over grapheme substrings of `s` ([#9261]). * Character predicates such as `islower()`, `isspace()`, etc. use utf8proc to provide uniform cross-platform behavior and up-to-date, locale-independent support for Unicode standards ([#5939]). * `reverseind` function to convert indices in reversed strings (e.g. from reversed regex searches) to indices in the original string ([#9249]). * `charwidth(c)` and `strwidth(s)` now return up-to-date cross-platform results (via utf8proc) ([#10659]): Julia now likes pizza ([#3721]), but some terminals still don't. * `is_valid_char(c)`, (now `isvalid(Char,c)` ([#11241])), now correctly handles Unicode "non-characters", which are valid Unicode codepoints ([#11171]). * Backreferences in replacement strings in calls to `replace` with a `Regex` pattern are now supported ([#11849]). Use the `s` string prefix to indicate a replacement string contains a backreference. For example, `replace("ab", r"(.)(.)", s"\2\1")` yields "ba". * Capture groups in regular expressions can now be named using PCRE syntax, `(?P...)`. Capture group matches can be accessed by name by indexing a `Match` object with the name of the group ([#11566]). * `countlines()` now counts all lines, not just non-empty ([#11947]). * Array and AbstractArray improvements * New multidimensional iterators and index types for efficient iteration over `AbstractArray`s. Array iteration should generally be written as `for i in eachindex(A) ... end` rather than `for i = 1:length(A) ... end` ([#8432]). * New implementation of SubArrays with substantial performance and functionality improvements ([#8501]). * AbstractArray subtypes only need to implement `size` and `getindex` for scalar indices to support indexing; all other indexing behaviors (including logical indexing, ranges of indices, vectors, colons, etc.) are implemented in default fallbacks. Similarly, they only need to implement scalar `setindex!` to support all forms of indexed assingment ([#10525]). * AbstractArrays that do not extend `similar` now return an `Array` by default ([#10525]). * Data structures * New `sortperm!` function for pre-allocated index arrays ([#8792]). * Switch from `O(N)` to `O(log N)` algorithm for `dequeue!(pq, key)` with `PriorityQueue`. This provides major speedups for large queues ([#8011]). * `PriorityQueue` now includes the order type among its parameters, `PriorityQueue{KeyType,ValueType,OrderType}`. An empty queue can be constructed as `pq = PriorityQueue(KeyType,ValueType)`, if you intend to use the default `Forward` order, or `pq = PriorityQueue(KeyType, ValueType, OrderType)` otherwise ([#8011]). * Efficient `mean` and `median` for ranges ([#8089]). * `deepcopy` recurses through immutable types and makes copies of their mutable fields ([#8560]). * `copy(a::DArray)` will now make a copy of a `DArray` ([#9745]). * New types * Enums are now supported through the `@enum EnumName EnumValue1 EnumValue2` syntax. Enum member values also support abitrary value assignment by the `@enum EnumName EnumValue1=1 EnumValue2=10 EnumValue3=20` syntax ([#10168]). * New `Dates` module for calendar dates and other time-interval calculations ([#7654]). * New `Nullable` type for missing data ([#8152]). * A new `Val{T}` type allows one to dispatch on bits-type values ([#9452]). * `linspace` now returns a `LinSpace` object which lazily computes linear interpolation of values between the start and stop values. It "lifts" endpoints which are approximately rational in the same manner as the `colon` operator. * Arithmetic * `convert` now checks for overflow when truncating integers or converting between signed and unsigned ([#5413]). * Arithmetic is type-preserving for more types; e.g. `(x::Int8) + (y::Int8)` now yields an `Int8` ([#3759]). * Reductions (e.g. `reduce`, `sum`) widen small types (integers smaller than `Int`, and `Float16`). * Added optional rounding argument to floating-point constructors ([#8845]). * Equality (`==`) and inequality (`<`/`<=`) comparisons are now correct across all numeric types ([#9133], [#9198]). * Rational arithmetic throws errors on overflow ([#8672]). * Optional `log` and `log1p` functions implemented in pure Julia (experimental) ([#10008]). * The `MathConst` type has been renamed `Irrational` ([#11922]). * `isapprox` now has simpler and more sensible default tolerances ([#12393]), supports arrays, and has synonyms `≈` ([U+2248](https://www.fileformat.info/info/unicode/char/2248/index.htm), LaTeX `\approx`) and `≉` ([U+2249](https://www.fileformat.info/info/unicode/char/2249/index.htm), LaTeX `\napprox`) for `isapprox` and `!isapprox`, respectively ([#12472]). * Numbers * `primes` is now faster and has been extended to generate the primes in a user defined closed interval ([#12025]). * The function `primesmask` which generates a prime sieve for a user defined closed interval is now exported ([#12025]). * Random numbers * Streamlined random number generation APIs [#8246]. The default `rand` no longer uses global state in the underlying C library, dSFMT, making it closer to being thread-safe ([#8399], [#8832]). All APIs can now take an `AbstractRNG` argument ([#8854], [#9065]). The seed argument to `srand` is now optional ([#8320], [#8854]). The APIs accepting a range argument are extended to accept an arbitrary `AbstractArray` ([#9049]). Passing a range of `BigInt` to `rand` or `rand!` is now supported ([#9122]). There are speed improvements across the board ([#8808], [#8941], [#8958], [#9083]). * Significantly faster `randn` ([#9126], [#9132]). * The `randexp` and `randexp!` functions are exported ([#9144]). * File * Added function `readlink` which returns the value of a symbolic link "path" ([#10714]). * Added function `ismount` which checks if a directory is a mount point ([#11279]). * The `cp` function now accepts keyword arguments `remove_destination` and `follow_symlinks` ([#10888]). * The `mv` function now accepts keyword argument `remove_destination` ([#11145]). * `Pipe()` creates a bidirectional I/O object that can be passed to `spawn` or `pipeline` for redirecting process streams ([#12739]). * Other improvements * You can now tab-complete emoji via their [short names](http://www.emoji-cheat-sheet.com/), using `\:name:` ([#10709]). * `gc_enable` subsumes `gc_disable`, and also returns the previous GC state. * `assert`, `@assert` now throws an `AssertionError` exception type ([#9734]). * `@simd` now rejects invalid control flow (`@goto` / break / continue) in the inner loop body at compile time ([#8624]). * The `machinefile` now supports a host count ([#7616]). * `code_native` now outputs branch labels ([#8897]). * Added `recvfrom` to get source address of UDP packets ([#9418]). * `ClusterManager` performance improvements ([#9309]) and support for changing transports([#9434]). * Added `Base.get_process_title` / `Base.set_process_title` ([#9957]). * `readavailable` now returns a byte vector instead of a string. * New `lock` and `unlock` functions, operating on `ReentrantLock`, to lock a stream during concurrent writes from multiple tasks ([#10679]). * `code_llvm` now outputs stripped IR without debug info or other attached metadata. Use `code_llvm_raw` for the unstripped output ([#10747]). * New `withenv(var=>val, ...) do ... end` function to temporarily modify environment variables ([#10914]). * New function `relpath` returns a relative filepath to path either from the current directory or from an optional start directory ([#10893]). * `mktemp` and `mktempdir` now take an optional argument to set which directory the temporary file or directory is created in. * New garbage collector tracked memory allocator functions: `jl_malloc`, `jl_calloc`, `jl_realloc`, and `jl_free` with libc API ([[#12034]]). * `mktempdir` and `mktemp` now have variants that take a function as its first argument for automated clean-up ([[#9017]]). Deprecated or removed --------------------- * several syntax whitespace insensitivities have been deprecated ([#11891]). ```julia # function call f (x) # getindex x [17] rand(2) [1] # function definition f (x) = x^2 function foo (x) x^2 end ``` * indexing with `Real`s that are not subtypes of `Integer` (`Rational`, `AbstractFloat`, etc.) has been deprecated ([#10458]). * `push!(A)` has been deprecated, use `append!` instead of splatting arguments to `push!` ([#10400]). * `names` for composite datatypes has been deprecated and renamed to `fieldnames` ([#10332]). * `DArray` functionality has been removed from `Base` and is now a standalone package under the JuliaParallel umbrella organization ([#10333]). * The `Graphics` module has been removed from `Base` and is now a standalone package ([#10150], [#9862]). * The `Woodbury` special matrix type has been removed from `LinAlg` ([#10024]). * `median` and `median!` no longer accept a `checknan` keyword argument ([#8605]). * `inf` and `nan` are now deprecated in favor of `T(Inf)` and `T(NaN)`, respectively ([#8776]). * `oftype(T::Type, x)` is deprecated in favor of `convert(T,x)` (or `T(x)`). * `{...}` syntax is deprecated in favor of `Any[...]` ([#8578]). * `itrunc`, `ifloor`, `iceil` and `iround` are deprecated in favour of `trunc{T<:Integer}(T,x)`, `floor{T<:Integer}(T,x)`, etc.. `trunc` is now always bound-checked;`Base.unsafe_trunc` provides the old unchecked `itrunc` behaviour ([#9133]). * `squeeze` now requires that passed dimension(s) are an `Int` or tuple of `Int`s; calling `squeeze` with an arbitrary iterator is deprecated ([#9271]). Additionally, passed dimensions must be unique and correspond to extant dimensions of the input array. * `randbool` is deprecated. Use `rand(Bool)` to produce a random boolean value, and `bitrand` to produce a random BitArray ([#9105], [#9569]). * `beginswith` is renamed to `startswith` ([#9578]). * `null` is renamed to `nullspace` ([#9714]). * The operators `|>`, `.>`, `>>`, and `.>>` as used for process I/O redirection are replaced with the `pipeline` function ([#5349], [#12739]). * `flipud(A)` and `fliplr(A)` have been deprecated in favor of `flipdim(A, 1)` and `flipdim(A, 2)`, respectively ([#10446]). * Numeric conversion functions whose names are lower-case versions of type names have been removed. To convert a scalar, use the type name, e.g. `Int32(x)`. To convert an array to a different element type, use `Array{T}(x)`, `map(T,x)`, or `round(T,x)`. To parse a string as an integer or floating-point number, use `parse` ([#1470], [#6211]). * Low-level functions from the C library and dynamic linker have been moved to modules `Libc` and `Libdl`, respectively ([#10328]). * The functions `parseint`, `parsefloat`, `float32_isvalid`, `float64_isvalid`, and the string-argument `BigInt` and `BigFloat` have been replaced by `parse` and `tryparse` with a type argument. The string macro `big"xx"` can be used to construct `BigInt` and `BigFloat` literals ([#3631], [#5704], [#9487], [#10543], [#10955]). * the `--int-literals` compiler option is no longer accepted ([#9597]). * Instead of `linrange`, use `linspace` ([#9666]). * The functions `is_valid_char`, `is_valid_ascii`, `is_valid_utf8`, `is_valid_utf16`, and `is_valid_utf32` have been replaced by generic `isvalid` methods. The single argument form `isvalid(value)` can now be used for values of type `Char`, `ASCIIString`, `UTF8String`, `UTF16String` and `UTF32String`. The two argument form `isvalid(type, value)` can be used with the above types, with values of type `Vector{UInt8}`, `Vector{UInt16}`, `Vector{UInt32}`, and `Vector{Char}` ([#11241]). * Instead of `utf32(64,123,...)` use `utf32(UInt32[64,123,...])` ([#11379]). * `start_timer` and `stop_timer` are replaced by `Timer` and `close`. * The following internal julia C functions have been renamed, in order to prevent potential naming conflicts with C libraries: ([#11741]) * `gc_wb*` -> `jl_gc_wb*` * `gc_queue_root` -> `jl_gc_queue_root` * `allocobj` -> `jl_gc_allocobj` * `alloc_[0-3]w` -> `jl_gc_alloc_*w` * `diff_gc_total_bytes` -> `jl_gc_diff_total_bytes` * `sync_gc_total_bytes` -> `jl_gc_sync_total_bytes` * `require(::AbstractString)` and `reload` (see news about addition of `compile`). * `cartesianmap` is deprecated in favor of iterating over a `CartesianRange` Julia v0.3.0 Release Notes ========================== New language features --------------------- * Greatly enhanced performance for passing and returning `Tuple`s ([#4042]). * `Tuple`s (of `Integer`s, `Symbol`s, or `Bool`s) can now be used as type parameters ([#5164]). * An additional default "inner" constructor accepting any arguments is now generated. Constructors that look like `MyType(a, b) = new(a, b)` do not need to be added manually ([#4026], [#7071]). * Expanded array type hierarchy to include an abstract `DenseArray` for in-memory arrays with standard strided storage ([#987], [#2345], [#6212]). * When reloading code, types whose definitions have not changed can be ignored in some cases. * Binary `~` now parses as a vararg macro call to `@~`. For example `x~y~z` => `@~ x y z` ([#4882]). * Structure fields can now be accessed by index ([#4806]). * If a module contains a function `__init__()`, it will be called when the module is first loaded, and on process startup if a pre-compiled version of the module is present ([#1268]). * Multi-line comments ([#69], [#6128]): `#= .... =#` * `--check-bounds=yes|no` compiler option * Unicode identifiers are normalized (NFC) so that different encodings of equivalent strings are treated as the same identifier ([#5462]). * The set of characters permitted in identifiers has been restricted based on Unicode categories. Generally, punctuation, formatting and control characters, and operator symbols are not allowed in identifiers. Number-like characters cannot begin identifiers ([#5936]). * Define a limited number of infix Unicode operators ([#552], [#6582]): | Precedence class | Operators (with synonyms, if any) | ---------------- | --------------------------------- | == | ≥ (>=) ≤ (<=) ≡ (===) ≠ (!=) ≢ (!==) .≥ (.>=) .≤ (.<=) .!= (.≠) ∈ (`in`) ∉ (`(x,y)->!in(x, y)`) ∋ (`(x,y)->in(y, x)`) ∌ (`(x,y)->!in(y, x)`) ⊆ (`issubset`) ⊈ (`(x,y)->!issubset(x, y)`) ⊊ (`(x,y)->x⊆y && x!=y`) | | + | ∪ (`union`) | | * | ÷ (`div`) ⋅ (`dot`) × (`cross`) ∩ (`intersect`) | | unary | √ ∛ | In addition to these, many of the Unicode operator symbols are parsed as infix operators and are available for user-defined methods ([#6929]). * Improved reporting of syntax errors ([#6179]) * `break` inside a `for` loop with multiple ranges now exits the entire loop nest ([#5154]) * Local goto statements using the `@goto` and `@label` macros ([#101]). REPL improvements ----------------- * New native-Julia REPL implementation, eliminating many problems stemming from the old GNU Readline-based REPL ([#6270]). * Tab-substitution of LaTeX math symbols (e.g. `\alpha` by `α`) ([#6911]). This also works in IJulia and in Emacs ([#6920]). * `workspace()` function for obtaining a fresh workspace ([#1195]). Library improvements -------------------- * `isequal` now compares all numbers by value, ignoring type ([#6624]). * Implement limited shared-memory parallelism with `SharedArray`s ([#5380]). * Well-behaved floating-point ranges ([#2333], [#5636]). Introduced the `FloatRange` type for floating-point ranges with a step, which will give intuitive/correct results for classically problematic ranges like `0.1:0.1:0.3`, `0.0:0.7:2.1` or `1.0:1/49:27.0`. * `mod2pi` function ([#4799], [#4862]). * New functions `minmax` and `extrema` ([#5275]). * New macros `@edit`, `@less`, `@code_typed`, `@code_lowered`, `@code_llvm` and `@code_native` that all function like `@which` ([#5832]). * `consume(p)` extended to `consume(p, args...)`, allowing it to optionally pass `args...` back to the producer ([#4775]). * `.juliarc.jl` is now loaded for both script and REPL execution ([#5076]). * The `Sys` module now includes convenient functions for working with dynamic library handles; `Sys.dllist` will list out all paths currently loaded via `dlopen`, and `Sys.dlpath` will lookup a path from a handle * `readdlm` treats multiple whitespace characters as a single delimiter by default (when no delimiter is specified). This is useful for reading fixed-width or messy whitespace-delimited data ([#5403]). * The Airy, Bessel, Hankel, and related functions (`airy*`, `bessel*`, `hankel*`) now detect errors returned by the underlying AMOS library, throwing an `AmosException` in that case ([#4967]). * `methodswith` now returns an array of `Method`s ([#5464]) rather than just printing its results. * `errno([code])` function to get or set the C library's `errno`. * `GitHub` module for interacting with the GitHub API. * Package improvements * Packages are now installed into `.julia/v0.3` by default (or whatever the current Julia version is), so that different versions of Julia can co-exist with incompatible packages. Existing `.julia` installations are unaffected unless `Pkg.init()` is run to re-create the package directories ([#3344], [#5737]). * `Pkg.submit(pkg[,commit])` function to automatically submit a GitHub pull request to the package author. * Collections improvements * `Array` assignment (e.g. `x[:] = y`) ignores singleton dimensions and allows the last dimension of one side to match all trailing dimensions of the other ([#4048], [#4383]). * `Dict(kv)` constructor for any iterator on `(key,value)` pairs. * Multi-key `Dict`s: `D[x,y...]` is now a synonym for `D[(x,y...)]` for associations `D` ([#4870]). * `push!` and `unshift!` can push multiple arguments ([#4782]). * `writedlm` and `writecsv` now accept any iterable collection of iterable rows, in addition to `AbstractArray` arguments, and the `writedlm` delimiter can be any printable object (e.g. a `String`) instead of just a `Char`. * `isempty` now works for any iterable collection ([#5827]). * `unique` now accepts an optional `dim` argument for finding unique rows or columns of a matrix or regions of a multidimensional array ([#5811]). * `Number` improvements * The `ImaginaryUnit` type no longer exists. Instead, `im` is of type `Complex{Bool}`. Making this work required changing the semantics of boolean multiplication to approximately, `true * x = x` and `false * x = zero(x)`, which can itself be considered useful ([#5468]). * `big` is now vectorized ([#4766]) * `nextpow` and `prevpow` now return the `a^n` values instead of the exponent `n` ([#4819]) * Overflow detection in `parseint` ([#4874]). * `rand` now supports arbitrary `Ranges` arguments ([#5059]). * `expm1` and `log1p` now support complex arguments ([#3141]). * Broadcasting `.//` is now included ([#7094]). * `prevfloat` and `nextfloat` now saturate at -Inf and Inf, respectively, and have otherwise been fixed to follow the IEEE-754 standard functions `nextDown` and `nextUp` ([#5025]). * New function `widen` for widening numeric types and values, and `widemul` for multiplying to a larger type ([#6169]). * `polygamma`, `digamma`, and `trigamma` now accept complex arguments, and `zeta(s, z)` now provides the Hurwitz zeta ([#7125]). * Narrow integer types (< 32 bits) are promoted to `Float64` rather than to `Float32` by `float(x)` ([#7390]). * `String` improvements * Triple-quoted regex strings, `r"""..."""` ([#4934]). * New string type, `UTF16String` ([#4930]), constructed by `utf16(s)` from another string, a `Uint16` array or pointer, or a byte array (possibly prefixed by a byte-order marker to indicate endian-ness). Its data is internally `NULL`-terminated for passing to C ([#7016]). * `CharString` is renamed to `UTF32String` ([#4943]), and its data is now internally `NULL`-terminated for passing to C ([#7016]). `CharString(c::Char...)` is deprecated in favor of `utf32(c...)`, and `utf32(s)` otherwise has functionality similar to `utf16(s)`. * New `WString` and `wstring` synonyms for either `UTF16String` and `utf16` or `UTF32String` and `utf32`, respectively, depending on the width of `Cwchar_t` ([#7016]). * `normalize_string` function to perform Unicode normalization, case-folding, and other transformations ([#5576]). * `pointer(s, i=1)` for `ByteString`, `UTF16String`, `UTF32String`, and `SubString`s thereof ([#5703]). * `bytestring` is automatically called on `String` arguments for conversion to `Ptr{Uint8}` in `ccall` ([#5677]). * Linear algebra improvements * Balancing options for eigenvector calculations for general matrices ([#5428]). * Mutating linear algebra functions no longer promote ([#5526]). * `condskeel` for Skeel condition numbers ([#5726]). * `norm(::Matrix)` no longer calculates a vector norm when the first dimension is one ([#5545]); it always uses the operator (induced) matrix norm. * New `vecnorm(itr, p=2)` function that computes the norm of any iterable collection of numbers as if it were a vector of the same length. This generalizes and replaces `normfro` ([#6057]), and `norm` is now type-stable ([#6056]). * New `UniformScaling` matrix type and identity `I` constant ([#5810]). * None of the concrete matrix factorization types are exported from `Base` by default anymore. * Sparse linear algebra * 1-d sparse `getindex` has been implemented ([#7047]) * Faster sparse `getindex` ([#7131]). * Faster sparse `kron` ([#4958]). * `sparse(A) \ B` now supports a matrix `B` of right-hand sides ([#5196]). * `eigs(A, sigma)` now uses shift-and-invert for nonzero shifts `sigma` and inverse iteration for `which="SM"`. If `sigma==nothing` (the new default), computes ordinary (forward) iterations ([#5776]). * `sprand` is faster, and whether any entry is nonzero is now determined independently with the specified probability ([#6726]). * Dense linear algebra for special matrix types * Interconversions between the special matrix types `Diagonal`, `Bidiagonal`, `SymTridiagonal`, `Triangular`, and `Triangular`, and `Matrix` are now allowed for matrices which are representable in both source and destination types ([5e3f074b]). * Allow for addition and subtraction over mixed matrix types, automatically promoting the result to the denser matrix type ([a448e080], [#5927]) * new algorithms for linear solvers and eigensystems of `Bidiagonal` matrices of generic element types ([#5277]) * new algorithms for linear solvers, eigensystems and singular systems of `Diagonal` matrices of generic element types ([#5263]) * new algorithms for linear solvers and eigensystems of `Triangular` matrices of generic element types ([#5255]) * specialized `inv` and `det` methods for `Tridiagonal` and `SymTridiagonal` based on recurrence relations between principal minors ([#5358]) * specialized `transpose`, `ctranspose`, `istril`, `istriu` methods for `Triangular` ([#5255]) and `Bidiagonal` ([#5277]) * new LAPACK wrappers - condition number estimate `cond(A::Triangular)` ([#5255]) * parametrize `Triangular` on matrix type ([#7064]) * Lyapunov / Sylvester solver ([#7435]) * `eigvals` for `Symmetric`, `Tridiagonal` and `Hermitian` matrices now support additional method signatures: ([#3688], [#6652], [#6678], [#7647]) - `eigvals(M, el, eu)` finds all eigenvalues in the interval `(el, eu]` - `eigvals(M, il:iu)` finds the `il`th through the `iu`th eigenvalues (in ascending order) * Dense linear algebra for generic matrix element types * LU factorization ([#5381] and [#5430]) * QR factorization ([#5526]) * New function `deleteat!` deletes a specified index or indices and returns the updated collection * The `setenv` function for external processes now accepts a `dir` keyword argument for specifying the directory to start the child process in ([#4888]). * Constructors for collections (`Set`, `Dict`, etc.) now generally accept a single iterable argument giving the elements of the collection ([#4996], [#4871]) * Ranges and arrays with the same elements are now unequal. This allows hashing and comparing ranges to be faster ([#5778]). * Broadcasting now works on arbitrary `AbstractArrays` ([#5387]) * Reduction functions that accept a pre-allocated output array, including `sum!`, `prod!`, `maximum!`, `minimum!`, `all!`, `any!` ([#6197], [#5387]) * Faster performance on `fill!` and `copy!` for array types not supporting efficient linear indexing ([#5671], [#5387]) * Changes to range types ([#5585]) * `Range` is now the abstract range type, instead of `Ranges` * New function `range` for constructing ranges by length * `Range` is now `StepRange`, and `Range1` is now `UnitRange`. Their constructors accept end points instead of lengths. Both are subtypes of a new abstract type `OrdinalRange`. * Ranges now support `BigInt` and general ordinal types. * Very large ranges (e.g. `0:typemax(Int)`) can now be constructed, but some operations (e.g. `length`) will raise an `OverflowError`. * Extended API for `cov` and `cor`, which accept keyword arguments `vardim`, `corrected`, and `mean` ([#6273]) * New functions `randsubseq` and `randsubseq!` to create a random subsequence of an array ([#6726]) * New macro `@evalpoly` for efficient inline evaluation of polynomials ([#7146]). * The signal filtering function `filt` now accepts an optional initial filter state vector. A new in-place function `filt!` is also exported ([#7513]). * Significantly faster `cumsum` and `cumprod` ([#7359]). * Implement `findmin` and `findmax` over specified array dimensions ([#6716]). * Support memory-mapping of files with offsets on Windows ([#7242]). * Catch writes to protect memory, such as when trying to modify a mmapped file opened in read-only mode ([#3434]). Environment improvements ------------------------ * New `--code-coverage` and `--track-allocation` startup features allow one to measure the number of executions or the amount of memory allocated, respectively, at each line of code ([#5423],[#7464]). * `Profile.init` now accepts keyword arguments, and returns the current settings when no arguments are supplied ([#7365]). Build improvements ------------------ * Dependencies are now verified against stored MD5/SHA512 hashes, to ensure that the correct file has been downloaded and was not modified ([#6773]). Deprecated or removed --------------------- * `convert(Ptr{T1}, x::Array{T2})` is now deprecated unless `T1 == T2` or `T1 == Void` ([#6073]). (You can still explicitly `convert` one pointer type into another if needed.) * `Sys.shlib_ext` has been renamed to `Sys.dlext` * `dense` is deprecated in favor of `full` ([#4759]). * The `Stat` type is renamed `StatStruct` ([#4670]). * `setrounding`, `rounding` and `setrounding` now take an additional argument specifying the floating point type to which they apply. The old behaviour and `[get/set/with]_bigfloat_rounding` functions are deprecated ([#5007]). * `cholpfact` and `qrpfact` are deprecated in favor of keyword arguments in `cholfact(..., pivot=true)` and `qrfact(..., pivot=true)` ([#5330]). * `symmetrize!` is deprecated in favor of `Base.LinAlg.copytri!` ([#5427]). * `myindexes` has been renamed to `localindexes` ([#5475]). * `factorize!` is deprecated in favor of `factorize` ([#5526]). * `nnz` counts the number of structural nonzeros in a sparse matrix. Use `countnz` for the actual number of nonzeros ([#6769]). * `setfield` is renamed `setfield!` ([#5748]). * `put` and `take` are renamed `put!` and `take!` ([#5511]). * `put!` now returns its first argument, the remote reference ([#5819]). * `read` methods that modify a passed array are now called `read!` ([#5970]) * `infs` and `nans` are deprecated in favor of the more general `fill`. * `*` and `div` are no longer supported for `Char`. * `Range` is renamed `StepRange` and `Range1` is renamed `UnitRange`. `Ranges` is renamed `Range`. * `bitmix` is replaced by a 2-argument form of `hash`. * `readsfrom` and `writesto` are replaced by `open` ([#6948]). * `insert!` now throws a `BoundsError` if `index > length(collection)+1` ([#7373]). * No longer exported from `Base`: * `start_reading`, `stop_reading`, `start_watching` ([#10885]). Julia v0.2.0 Release Notes ========================== The 0.2 release brings improvements to many areas of Julia. Among the most visible changes are support for 64-bit Windows, keyword arguments to functions, immutable types, a redesigned and polished package manager, a multimedia interface supporting usage of Julia in IPython, a built-in profiler, and major improvements to Julia's linear algebra, I/O, and parallel capabilities. These are accompanied by many other changes adding new features, enhancing the library's consistency, improving performance, increasing test coverage, easing installation, and expanding the documentation. While not part of Julia proper, the package ecosystem has also grown and matured considerably since the 0.1 release. See below for more information about the long list of changes that improve Julia's usability and performance. New language features --------------------- * Keyword & optional function arguments ([#485], [#1817]). * Immutable types ([#13]). * Triple-quoted string literals ([#70]). * New infix operator `in` (e.g. `x in S`), and corresponding function `in(x,S)`, replacing `contains(S,x)` function ([#2703]). * New variable bindings on each for loop and comprehension iteration ([#1571]). For example, before this change: julia> map(f->f(), { ()->i for i=1:3 }) 3-element Any Array: 3 3 3 and after: julia> map(f->f(), { ()->i for i=1:3 }) 3-element Any Array: 1 2 3 * Explicit relative importing ([#2375]). * Methods can be added to functions in other modules using dot syntax, as in `Foo.bar(x) = 0`. * `import module: name1, name2, ...` ([#5214]). * A semicolon is now allowed after an `import` or `using` statement ([#4130]). * In an interactive session (REPL), you can use `;cmd` to run `cmd` via an interactive shell. For example: julia> ;ls CONTRIBUTING.md Makefile VERSION cli/ deps/ julia@ DISTRIBUTING.md NEWS.md Windows.inc doc/ src/ usr/ LICENSE.md README.md base/ etc/ test/ Make.inc README.windows.md contrib/ examples/ tmp/ New library functions --------------------- * Sampling profiler ([#2597]). * Functions for examining stages of the compiler's output: `code_lowered`, `code_typed`, `code_llvm`, and `code_native`. * Multimedia I/O API (display, writemime, etcetera) ([#3932]). * MPFR-based `BigFloat` ([#2814]), and many new `BigFloat` operations. * New half-precision IEEE floating-point type, `Float16` ([#3467]). * Support for setting floating-point rounding modes ([#3149]). * `methodswith` shows all methods with an argument of specific type. * `mapslices` provides a general way to perform operations on slices of arrays ([#2204]). * `repeat` function for constructing Arrays with repeated elements ([#3605]). * `Collections.PriorityQueue` type and `Collections.heap` functions ([#2920]). * `quadgk` 1d-integration routine ([#3140]). * `erfinv` and `erfcinv` functions ([#2987]). * `varm`, `stdm` ([#2265]). * `digamma`, `invdigamma`, `trigamma` and `polygamma` for calculating derivatives of `gamma` function ([#3233]). * `logdet` ([#3070]). * Names for C-compatible types: `Cchar`, `Clong`, etc. ([#2370]). * `cglobal` to access global variables ([#1815]). * `unsafe_pointer_to_objref` ([#2468]) and `pointer_from_objref` ([#2515]). * `readandwrite` for external processes. * I/O functions `readbytes` and `readbytes!` ([#3878]). * `flush_cstdio` function ([#3949]). * ClusterManager makes it possible to support different types of compute clusters ([#3649], [#4014]). * `rmprocs` for removing processors from a parallel computing session. The system can also tolerate to some extent processors that die unexpectedly ([#3050]). * `interrupt` for interrupting worker processes ([#3819]). * `timedwait` does a polled wait for an event till a specified timeout. * `Condition` type with `wait` and `notify` functions for `Task` synchronization. * `versioninfo` provides detailed version information, especially useful when reporting and diagnosing bugs. * `detach` for running child processes in a separate process group. * `setenv` for passing environment variables to child processes. * `ifelse` eagerly-evaluated conditional function, especially useful for vectorized conditionals. Library improvements -------------------- * `isequal` now returns `false` for numbers of different types. This makes it much easier to define hashing for new numeric types. Uses of `Dict` with numeric keys might need to change to account for this increased strictness. * A redesigned and rewritten `Pkg` system is much more robust in case of problems. The basic interface to adding and removing package requirements remains the same, but great deal of additional functionality for developing packages in-place was added. See the new [packages chapter] in the manual for further details. * Sorting API updates ([#3665]) – see [sorting functions]. * The `delete!(d::Dict, key)` function has been split into separate `pop!` and `delete!` functions ([#3439]). `pop!(d,key)` removes `key` from `d` and returns the value that was associated with it; it throws an exception if `d` does not contain `key`. `delete!(d,key)` removes `key` from `d` and succeeds regardless of whether `d` contained `key` or not, returning `d` itself in either case. * Linear-algebra factorization routines (`lu`, `chol`, etc.) now return `Factorization` objects (and `lud`, `chold`, etc. are deprecated; [#2212]). * A number of improvements to sparse matrix capabilities and sparse linear algebra. * More linear algebra fixes and eigensolver hooks for `SymTridiagonal`, `Tridiagonal` and `Bidiagonal` matrix types ([#2606], [#2608], [#2609], [#2611], [#2678], [#2713], [#2720], [#2725]). * Change `integer_valued`, `real_valued`, and so on to `isinteger`, `isreal`, and so on, and semantics of the later are now value-based rather than type-based, unlike MATLAB/Octave ([#3071]). `isbool` and `iscomplex` are eliminated in favor of a general `iseltype` function. * Transitive comparison of floats with rationals ([#3102]). * Fast prime generation with `primes` and fast primality testing with `isprime`. * `sum` and `cumsum` now use [pairwise summation] for better accuracy ([#4039]). * Dot operators (`.+`, `.*` etc.) now broadcast singleton dimensions of array arguments. This behavior can be applied to any function using `broadcast(f, ...)`. * `combinations`, `permutations`, and `partitions` now return iterators instead of a task, and `integer_partitions` has been renamed to `partitions` ([#3989], [#4055]). * `isreadable`/`iswritable` methods added for more IO types ([#3872]). * Much faster and improved `readdlm` and `writedlm` ([#3350], [#3468], [#3483]). * Faster `matchall` ([#3719]), and various string and regex improvements. * Documentation of advanced linear algebra features ([#2807]). * Support optional RTLD flags in `dlopen` ([#2380]). * `pmap` now works with any iterable collection. * Options in `pmap` for retrying or ignoring failed tasks. * New `sinpi(x)` and `cospi(x)` functions to compute sine and cosine of `pi*x` more accurately ([#4112]). * New implementations of elementary complex functions `sqrt`, `log`, `asin`, `acos`, `atan`, `tanh`, `asinh`, `acosh`, `atanh` with correct branch cuts ([#2891]). * Improved behavior of `SubArray` ([#4412], [#4284], [#4044], [#3697], [#3790], [#3148], [#2844], [#2644] and various other fixes). * New convenience functions in graphics API. * Improved backtraces on Windows and OS X. * Implementation of reduction functions (including `reduce`, `mapreduce`, `sum`, `prod`, `maximum`, `minimum`, `all`, and `any`) are refactored, with improved type stability, efficiency, and consistency ([#6116], [#7035], [#7061], [#7106]). Deprecated or removed --------------------- * Methods of `min` and `max` that do reductions were renamed to `minimum` and `maximum`. `min(x)` is now `minimum(x)`, and `min(x,(),dim)` is now `minimum(x,dim)` ([#4235]). * `ComplexPair` was renamed to `Complex` and made `immutable`, and `Complex128` and so on are now aliases to the new `Complex` type. * `!` was added to the name of many mutating functions, e.g., `push` was renamed `push!` ([#907]). * `ref` renamed to `getindex`, and `assign` to `setindex!` ([#1484]). * `writeable` renamed to `writable` ([#3874]). * `logb` and `ilogb` renamed to `exponent` ([#2516]). * `quote_string` became a method of `repr`. * `safe_char`, `check_ascii`, and `check_utf8` replaced by `is_valid_char`, `is_valid_ascii`, and `is_valid_utf8`, respectively. * `each_line`, `each_match`, `begins_with`, `ends_with`, `parse_float`, `parse_int`, and `seek_end` replaced by: `eachline`, `eachmatch`, and so on (`_` was removed) ([#1539]). * `parse_bin(s)` replaced by `parseint(s,2)`; `parse_oct(s)` replaced by `parseint(s,8)`; `parse_hex(s)` replaced by `parseint(s,16)`. * `findn_nzs` replaced by `findnz` ([#1539]). * `DivideByZeroError` replaced by `DivideError`. * `addprocs_ssh`, `addprocs_ssh_tunnel`, and `addprocs_local` replaced by `addprocs` (with keyword options). * `remote_call`, `remote_call_fetch`, and `remote_call_wait` replaced by `remotecall`, `remotecall_fetch`, and `remotecall_wait`. * `has` replaced by `in` for sets and by `haskey` for dictionaries. * `diagmm` and `diagmm!` replaced by `scale` and `scale!` ([#2916]). * `unsafe_ref` and `unsafe_assign` replaced by `unsafe_load` and `unsafe_store!`. * `add_each!` and `del_each!` replaced by `union!` and `setdiff!`. * `isdenormal` renamed to `issubnormal` ([#3105]). * `expr` replaced by direct call to `Expr` constructor. * `|`, `&`, `$`, `-`, and `~` for sets replaced by `union`, `intersect`, `symdiff`, `setdiff`, and `complement` ([#3272]). * `square` function removed. * `pascal` function removed. * `add` and `add!` for `Set` replaced by `push!`. * `ls` function deprecated in favor of `readdir` or `;ls` in the REPL. * `start_timer` now expects arguments in units of seconds, not milliseconds. * Shell redirection operators `|`, `>`, and `<` eliminated in favor of a new operator `|>` ([#3523]). * `amap` is deprecated in favor of new `mapslices` functionality. * The `Reverse` iterator was removed since it did not work in many cases. * The `gcd` function now returns a non-negative value regardless of the argument signs, and various other sign problems with `invmod`, `lcm`, `gcdx`, and `powermod` were fixed ([#4811]). Miscellaneous changes --------------------- * `julia-release-*` executables renamed to `julia-*`, and `libjulia-release` renamed to `libjulia` ([#4177]). * Packages will now be installed in `.julia/vX.Y`, where X.Y is the current Julia version. Bugfixes and performance updates -------------------------------- Too numerous to mention. [packages chapter]: https://docs.julialang.org/en/v1/stdlib/Pkg/ [sorting functions]: https://docs.julialang.org/en/v1/base/sort/ [pairwise summation]: https://en.wikipedia.org/wiki/Pairwise_summation [a448e080]: https://github.com/JuliaLang/julia/commit/a448e080dc736c7fb326426dfcb2528be36973d3 [5e3f074b]: https://github.com/JuliaLang/julia/commit/5e3f074b9173044a0a4219f9b285879ff7cec041 [#13]: https://github.com/JuliaLang/julia/issues/13 [#69]: https://github.com/JuliaLang/julia/issues/69 [#70]: https://github.com/JuliaLang/julia/issues/70 [#101]: https://github.com/JuliaLang/julia/issues/101 [#265]: https://github.com/JuliaLang/julia/issues/265 [#485]: https://github.com/JuliaLang/julia/issues/485 [#550]: https://github.com/JuliaLang/julia/issues/550 [#552]: https://github.com/JuliaLang/julia/issues/552 [#907]: https://github.com/JuliaLang/julia/issues/907 [#964]: https://github.com/JuliaLang/julia/issues/964 [#987]: https://github.com/JuliaLang/julia/issues/987 [#1090]: https://github.com/JuliaLang/julia/issues/1090 [#1195]: https://github.com/JuliaLang/julia/issues/1195 [#1268]: https://github.com/JuliaLang/julia/issues/1268 [#1470]: https://github.com/JuliaLang/julia/issues/1470 [#1484]: https://github.com/JuliaLang/julia/issues/1484 [#1539]: https://github.com/JuliaLang/julia/issues/1539 [#1571]: https://github.com/JuliaLang/julia/issues/1571 [#1815]: https://github.com/JuliaLang/julia/issues/1815 [#1817]: https://github.com/JuliaLang/julia/issues/1817 [#2204]: https://github.com/JuliaLang/julia/issues/2204 [#2212]: https://github.com/JuliaLang/julia/issues/2212 [#2265]: https://github.com/JuliaLang/julia/issues/2265 [#2333]: https://github.com/JuliaLang/julia/issues/2333 [#2345]: https://github.com/JuliaLang/julia/issues/2345 [#2370]: https://github.com/JuliaLang/julia/issues/2370 [#2375]: https://github.com/JuliaLang/julia/issues/2375 [#2380]: https://github.com/JuliaLang/julia/issues/2380 [#2403]: https://github.com/JuliaLang/julia/issues/2403 [#2468]: https://github.com/JuliaLang/julia/issues/2468 [#2488]: https://github.com/JuliaLang/julia/issues/2488 [#2515]: https://github.com/JuliaLang/julia/issues/2515 [#2516]: https://github.com/JuliaLang/julia/issues/2516 [#2597]: https://github.com/JuliaLang/julia/issues/2597 [#2606]: https://github.com/JuliaLang/julia/issues/2606 [#2608]: https://github.com/JuliaLang/julia/issues/2608 [#2609]: https://github.com/JuliaLang/julia/issues/2609 [#2611]: https://github.com/JuliaLang/julia/issues/2611 [#2644]: https://github.com/JuliaLang/julia/issues/2644 [#2678]: https://github.com/JuliaLang/julia/issues/2678 [#2703]: https://github.com/JuliaLang/julia/issues/2703 [#2713]: https://github.com/JuliaLang/julia/issues/2713 [#2720]: https://github.com/JuliaLang/julia/issues/2720 [#2725]: https://github.com/JuliaLang/julia/issues/2725 [#2807]: https://github.com/JuliaLang/julia/issues/2807 [#2814]: https://github.com/JuliaLang/julia/issues/2814 [#2844]: https://github.com/JuliaLang/julia/issues/2844 [#2891]: https://github.com/JuliaLang/julia/issues/2891 [#2916]: https://github.com/JuliaLang/julia/issues/2916 [#2920]: https://github.com/JuliaLang/julia/issues/2920 [#2987]: https://github.com/JuliaLang/julia/issues/2987 [#3050]: https://github.com/JuliaLang/julia/issues/3050 [#3070]: https://github.com/JuliaLang/julia/issues/3070 [#3071]: https://github.com/JuliaLang/julia/issues/3071 [#3102]: https://github.com/JuliaLang/julia/issues/3102 [#3105]: https://github.com/JuliaLang/julia/issues/3105 [#3140]: https://github.com/JuliaLang/julia/issues/3140 [#3141]: https://github.com/JuliaLang/julia/issues/3141 [#3148]: https://github.com/JuliaLang/julia/issues/3148 [#3149]: https://github.com/JuliaLang/julia/issues/3149 [#3214]: https://github.com/JuliaLang/julia/issues/3214 [#3233]: https://github.com/JuliaLang/julia/issues/3233 [#3272]: https://github.com/JuliaLang/julia/issues/3272 [#3344]: https://github.com/JuliaLang/julia/issues/3344 [#3350]: https://github.com/JuliaLang/julia/issues/3350 [#3434]: https://github.com/JuliaLang/julia/issues/3434 [#3439]: https://github.com/JuliaLang/julia/issues/3439 [#3467]: https://github.com/JuliaLang/julia/issues/3467 [#3468]: https://github.com/JuliaLang/julia/issues/3468 [#3483]: https://github.com/JuliaLang/julia/issues/3483 [#3523]: https://github.com/JuliaLang/julia/issues/3523 [#3605]: https://github.com/JuliaLang/julia/issues/3605 [#3631]: https://github.com/JuliaLang/julia/issues/3631 [#3649]: https://github.com/JuliaLang/julia/issues/3649 [#3665]: https://github.com/JuliaLang/julia/issues/3665 [#3688]: https://github.com/JuliaLang/julia/issues/3688 [#3697]: https://github.com/JuliaLang/julia/issues/3697 [#3719]: https://github.com/JuliaLang/julia/issues/3719 [#3721]: https://github.com/JuliaLang/julia/issues/3721 [#3737]: https://github.com/JuliaLang/julia/issues/3737 [#3759]: https://github.com/JuliaLang/julia/issues/3759 [#3790]: https://github.com/JuliaLang/julia/issues/3790 [#3819]: https://github.com/JuliaLang/julia/issues/3819 [#3872]: https://github.com/JuliaLang/julia/issues/3872 [#3874]: https://github.com/JuliaLang/julia/issues/3874 [#3878]: https://github.com/JuliaLang/julia/issues/3878 [#3932]: https://github.com/JuliaLang/julia/issues/3932 [#3949]: https://github.com/JuliaLang/julia/issues/3949 [#3989]: https://github.com/JuliaLang/julia/issues/3989 [#4014]: https://github.com/JuliaLang/julia/issues/4014 [#4026]: https://github.com/JuliaLang/julia/issues/4026 [#4039]: https://github.com/JuliaLang/julia/issues/4039 [#4042]: https://github.com/JuliaLang/julia/issues/4042 [#4044]: https://github.com/JuliaLang/julia/issues/4044 [#4048]: https://github.com/JuliaLang/julia/issues/4048 [#4055]: https://github.com/JuliaLang/julia/issues/4055 [#4112]: https://github.com/JuliaLang/julia/issues/4112 [#4130]: https://github.com/JuliaLang/julia/issues/4130 [#4163]: https://github.com/JuliaLang/julia/issues/4163 [#4177]: https://github.com/JuliaLang/julia/issues/4177 [#4211]: https://github.com/JuliaLang/julia/issues/4211 [#4235]: https://github.com/JuliaLang/julia/issues/4235 [#4284]: https://github.com/JuliaLang/julia/issues/4284 [#4383]: https://github.com/JuliaLang/julia/issues/4383 [#4412]: https://github.com/JuliaLang/julia/issues/4412 [#4470]: https://github.com/JuliaLang/julia/issues/4470 [#4615]: https://github.com/JuliaLang/julia/issues/4615 [#4670]: https://github.com/JuliaLang/julia/issues/4670 [#4759]: https://github.com/JuliaLang/julia/issues/4759 [#4766]: https://github.com/JuliaLang/julia/issues/4766 [#4775]: https://github.com/JuliaLang/julia/issues/4775 [#4782]: https://github.com/JuliaLang/julia/issues/4782 [#4799]: https://github.com/JuliaLang/julia/issues/4799 [#4806]: https://github.com/JuliaLang/julia/issues/4806 [#4811]: https://github.com/JuliaLang/julia/issues/4811 [#4819]: https://github.com/JuliaLang/julia/issues/4819 [#4862]: https://github.com/JuliaLang/julia/issues/4862 [#4867]: https://github.com/JuliaLang/julia/issues/4867 [#4870]: https://github.com/JuliaLang/julia/issues/4870 [#4871]: https://github.com/JuliaLang/julia/issues/4871 [#4874]: https://github.com/JuliaLang/julia/issues/4874 [#4882]: https://github.com/JuliaLang/julia/issues/4882 [#4888]: https://github.com/JuliaLang/julia/issues/4888 [#4923]: https://github.com/JuliaLang/julia/issues/4923 [#4930]: https://github.com/JuliaLang/julia/issues/4930 [#4934]: https://github.com/JuliaLang/julia/issues/4934 [#4943]: https://github.com/JuliaLang/julia/issues/4943 [#4958]: https://github.com/JuliaLang/julia/issues/4958 [#4967]: https://github.com/JuliaLang/julia/issues/4967 [#4996]: https://github.com/JuliaLang/julia/issues/4996 [#5007]: https://github.com/JuliaLang/julia/issues/5007 [#5025]: https://github.com/JuliaLang/julia/issues/5025 [#5059]: https://github.com/JuliaLang/julia/issues/5059 [#5076]: https://github.com/JuliaLang/julia/issues/5076 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https://github.com/JuliaLang/julia/issues/5423 [#5427]: https://github.com/JuliaLang/julia/issues/5427 [#5428]: https://github.com/JuliaLang/julia/issues/5428 [#5430]: https://github.com/JuliaLang/julia/issues/5430 [#5462]: https://github.com/JuliaLang/julia/issues/5462 [#5464]: https://github.com/JuliaLang/julia/issues/5464 [#5468]: https://github.com/JuliaLang/julia/issues/5468 [#5475]: https://github.com/JuliaLang/julia/issues/5475 [#5511]: https://github.com/JuliaLang/julia/issues/5511 [#5526]: https://github.com/JuliaLang/julia/issues/5526 [#5545]: https://github.com/JuliaLang/julia/issues/5545 [#5576]: https://github.com/JuliaLang/julia/issues/5576 [#5585]: https://github.com/JuliaLang/julia/issues/5585 [#5636]: https://github.com/JuliaLang/julia/issues/5636 [#5671]: https://github.com/JuliaLang/julia/issues/5671 [#5677]: https://github.com/JuliaLang/julia/issues/5677 [#5703]: https://github.com/JuliaLang/julia/issues/5703 [#5704]: https://github.com/JuliaLang/julia/issues/5704 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https://github.com/JuliaLang/julia/issues/6081 [#6116]: https://github.com/JuliaLang/julia/issues/6116 [#6128]: https://github.com/JuliaLang/julia/issues/6128 [#6169]: https://github.com/JuliaLang/julia/issues/6169 [#6179]: https://github.com/JuliaLang/julia/issues/6179 [#6190]: https://github.com/JuliaLang/julia/issues/6190 [#6197]: https://github.com/JuliaLang/julia/issues/6197 [#6211]: https://github.com/JuliaLang/julia/issues/6211 [#6212]: https://github.com/JuliaLang/julia/issues/6212 [#6270]: https://github.com/JuliaLang/julia/issues/6270 [#6273]: https://github.com/JuliaLang/julia/issues/6273 [#6582]: https://github.com/JuliaLang/julia/issues/6582 [#6624]: https://github.com/JuliaLang/julia/issues/6624 [#6652]: https://github.com/JuliaLang/julia/issues/6652 [#6678]: https://github.com/JuliaLang/julia/issues/6678 [#6716]: https://github.com/JuliaLang/julia/issues/6716 [#6726]: https://github.com/JuliaLang/julia/issues/6726 [#6739]: https://github.com/JuliaLang/julia/issues/6739 [#6769]: https://github.com/JuliaLang/julia/issues/6769 [#6773]: https://github.com/JuliaLang/julia/issues/6773 [#6842]: https://github.com/JuliaLang/julia/issues/6842 [#6911]: https://github.com/JuliaLang/julia/issues/6911 [#6920]: https://github.com/JuliaLang/julia/issues/6920 [#6929]: https://github.com/JuliaLang/julia/issues/6929 [#6948]: https://github.com/JuliaLang/julia/issues/6948 [#7016]: https://github.com/JuliaLang/julia/issues/7016 [#7035]: https://github.com/JuliaLang/julia/issues/7035 [#7047]: https://github.com/JuliaLang/julia/issues/7047 [#7061]: https://github.com/JuliaLang/julia/issues/7061 [#7064]: https://github.com/JuliaLang/julia/issues/7064 [#7071]: https://github.com/JuliaLang/julia/issues/7071 [#7094]: https://github.com/JuliaLang/julia/issues/7094 [#7106]: https://github.com/JuliaLang/julia/issues/7106 [#7125]: https://github.com/JuliaLang/julia/issues/7125 [#7131]: https://github.com/JuliaLang/julia/issues/7131 [#7146]: https://github.com/JuliaLang/julia/issues/7146 [#7234]: https://github.com/JuliaLang/julia/issues/7234 [#7236]: https://github.com/JuliaLang/julia/issues/7236 [#7242]: https://github.com/JuliaLang/julia/issues/7242 [#7258]: https://github.com/JuliaLang/julia/issues/7258 [#7264]: https://github.com/JuliaLang/julia/issues/7264 [#7311]: https://github.com/JuliaLang/julia/issues/7311 [#7359]: https://github.com/JuliaLang/julia/issues/7359 [#7365]: https://github.com/JuliaLang/julia/issues/7365 [#7373]: https://github.com/JuliaLang/julia/issues/7373 [#7390]: https://github.com/JuliaLang/julia/issues/7390 [#7435]: https://github.com/JuliaLang/julia/issues/7435 [#7464]: https://github.com/JuliaLang/julia/issues/7464 [#7513]: https://github.com/JuliaLang/julia/issues/7513 [#7616]: https://github.com/JuliaLang/julia/issues/7616 [#7647]: https://github.com/JuliaLang/julia/issues/7647 [#7654]: https://github.com/JuliaLang/julia/issues/7654 [#7669]: https://github.com/JuliaLang/julia/issues/7669 [#7704]: https://github.com/JuliaLang/julia/issues/7704 [#7917]: https://github.com/JuliaLang/julia/issues/7917 [#7992]: https://github.com/JuliaLang/julia/issues/7992 [#8011]: https://github.com/JuliaLang/julia/issues/8011 [#8036]: https://github.com/JuliaLang/julia/issues/8036 [#8089]: https://github.com/JuliaLang/julia/issues/8089 [#8113]: https://github.com/JuliaLang/julia/issues/8113 [#8135]: https://github.com/JuliaLang/julia/issues/8135 [#8152]: https://github.com/JuliaLang/julia/issues/8152 [#8246]: https://github.com/JuliaLang/julia/issues/8246 [#8283]: https://github.com/JuliaLang/julia/issues/8283 [#8297]: https://github.com/JuliaLang/julia/issues/8297 [#8320]: https://github.com/JuliaLang/julia/issues/8320 [#8399]: https://github.com/JuliaLang/julia/issues/8399 [#8423]: https://github.com/JuliaLang/julia/issues/8423 [#8432]: https://github.com/JuliaLang/julia/issues/8432 [#8467]: https://github.com/JuliaLang/julia/issues/8467 [#8501]: https://github.com/JuliaLang/julia/issues/8501 [#8560]: https://github.com/JuliaLang/julia/issues/8560 [#8578]: https://github.com/JuliaLang/julia/issues/8578 [#8599]: https://github.com/JuliaLang/julia/issues/8599 [#8605]: https://github.com/JuliaLang/julia/issues/8605 [#8624]: https://github.com/JuliaLang/julia/issues/8624 [#8660]: https://github.com/JuliaLang/julia/issues/8660 [#8672]: https://github.com/JuliaLang/julia/issues/8672 [#8712]: https://github.com/JuliaLang/julia/issues/8712 [#8734]: https://github.com/JuliaLang/julia/issues/8734 [#8745]: https://github.com/JuliaLang/julia/issues/8745 [#8750]: https://github.com/JuliaLang/julia/issues/8750 [#8776]: https://github.com/JuliaLang/julia/issues/8776 [#8791]: https://github.com/JuliaLang/julia/issues/8791 [#8792]: https://github.com/JuliaLang/julia/issues/8792 [#8808]: https://github.com/JuliaLang/julia/issues/8808 [#8814]: https://github.com/JuliaLang/julia/issues/8814 [#8816]: https://github.com/JuliaLang/julia/issues/8816 [#8827]: https://github.com/JuliaLang/julia/issues/8827 [#8832]: https://github.com/JuliaLang/julia/issues/8832 [#8845]: https://github.com/JuliaLang/julia/issues/8845 [#8846]: https://github.com/JuliaLang/julia/issues/8846 [#8854]: https://github.com/JuliaLang/julia/issues/8854 [#8867]: https://github.com/JuliaLang/julia/issues/8867 [#8872]: https://github.com/JuliaLang/julia/issues/8872 [#8897]: https://github.com/JuliaLang/julia/issues/8897 [#8905]: https://github.com/JuliaLang/julia/issues/8905 [#8941]: https://github.com/JuliaLang/julia/issues/8941 [#8958]: https://github.com/JuliaLang/julia/issues/8958 [#8974]: https://github.com/JuliaLang/julia/issues/8974 [#9017]: https://github.com/JuliaLang/julia/issues/9017 [#9049]: https://github.com/JuliaLang/julia/issues/9049 [#9065]: https://github.com/JuliaLang/julia/issues/9065 [#9083]: https://github.com/JuliaLang/julia/issues/9083 [#9105]: https://github.com/JuliaLang/julia/issues/9105 [#9122]: https://github.com/JuliaLang/julia/issues/9122 [#9126]: https://github.com/JuliaLang/julia/issues/9126 [#9132]: https://github.com/JuliaLang/julia/issues/9132 [#9133]: https://github.com/JuliaLang/julia/issues/9133 [#9144]: https://github.com/JuliaLang/julia/issues/9144 [#9198]: https://github.com/JuliaLang/julia/issues/9198 [#9249]: https://github.com/JuliaLang/julia/issues/9249 [#9261]: https://github.com/JuliaLang/julia/issues/9261 [#9271]: https://github.com/JuliaLang/julia/issues/9271 [#9294]: https://github.com/JuliaLang/julia/issues/9294 [#9309]: https://github.com/JuliaLang/julia/issues/9309 [#9343]: https://github.com/JuliaLang/julia/issues/9343 [#9418]: https://github.com/JuliaLang/julia/issues/9418 [#9425]: https://github.com/JuliaLang/julia/issues/9425 [#9434]: https://github.com/JuliaLang/julia/issues/9434 [#9452]: https://github.com/JuliaLang/julia/issues/9452 [#9482]: https://github.com/JuliaLang/julia/issues/9482 [#9487]: https://github.com/JuliaLang/julia/issues/9487 [#9503]: https://github.com/JuliaLang/julia/issues/9503 [#9569]: https://github.com/JuliaLang/julia/issues/9569 [#9575]: https://github.com/JuliaLang/julia/issues/9575 [#9578]: https://github.com/JuliaLang/julia/issues/9578 [#9597]: https://github.com/JuliaLang/julia/issues/9597 [#9627]: https://github.com/JuliaLang/julia/issues/9627 [#9666]: https://github.com/JuliaLang/julia/issues/9666 [#9690]: https://github.com/JuliaLang/julia/issues/9690 [#9701]: https://github.com/JuliaLang/julia/issues/9701 [#9714]: https://github.com/JuliaLang/julia/issues/9714 [#9734]: https://github.com/JuliaLang/julia/issues/9734 [#9745]: https://github.com/JuliaLang/julia/issues/9745 [#9779]: https://github.com/JuliaLang/julia/issues/9779 [#9862]: https://github.com/JuliaLang/julia/issues/9862 [#9957]: https://github.com/JuliaLang/julia/issues/9957 [#10008]: https://github.com/JuliaLang/julia/issues/10008 [#10024]: https://github.com/JuliaLang/julia/issues/10024 [#10031]: https://github.com/JuliaLang/julia/issues/10031 [#10075]: https://github.com/JuliaLang/julia/issues/10075 [#10117]: https://github.com/JuliaLang/julia/issues/10117 [#10150]: https://github.com/JuliaLang/julia/issues/10150 [#10168]: https://github.com/JuliaLang/julia/issues/10168 [#10180]: https://github.com/JuliaLang/julia/issues/10180 [#10228]: https://github.com/JuliaLang/julia/issues/10228 [#10328]: https://github.com/JuliaLang/julia/issues/10328 [#10331]: https://github.com/JuliaLang/julia/issues/10331 [#10332]: https://github.com/JuliaLang/julia/issues/10332 [#10333]: https://github.com/JuliaLang/julia/issues/10333 [#10380]: https://github.com/JuliaLang/julia/issues/10380 [#10400]: https://github.com/JuliaLang/julia/issues/10400 [#10446]: https://github.com/JuliaLang/julia/issues/10446 [#10458]: https://github.com/JuliaLang/julia/issues/10458 [#10472]: https://github.com/JuliaLang/julia/issues/10472 [#10525]: https://github.com/JuliaLang/julia/issues/10525 [#10543]: 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