https://github.com/JuliaLang/julia
Tip revision: 3bbc6e1d593ad22afe3de396f18c2def4fe9b971 authored by Takafumi Arakaki on 15 December 2021, 20:37:22 UTC
Merge branch 'master' into tkf/jltapir-pr
Merge branch 'master' into tkf/jltapir-pr
Tip revision: 3bbc6e1
NEWS.md
Julia v1.8 Release Notes
========================
New language features
---------------------
* `Module(:name, false, false)` can be used to create a `module` that contains no names (it does not import `Base` or `Core` and does not contain a reference to itself). ([#40110, #42154])
* `@inline` and `@noinline` annotations can be used within a function body to give an extra
hint about the inlining cost to the compiler. ([#41312])
* `@inline` and `@noinline` annotations can now be applied to a function callsite or block
to enforce the involved function calls to be (or not to be) inlined. ([#41312])
* The default behavior of observing `@inbounds` declarations is now an option via `auto` in `--check-bounds=yes|no|auto` ([#41551])
* New function `eachsplit(str)` for iteratively performing `split(str)`.
* `∀`, `∃`, and `∄` are now allowed as identifier characters ([#42314]).
* `try`-blocks can now optionally have an `else`-block which is executed right after the main body only if
no errors were thrown. ([#42211])
Language changes
----------------
* Newly created Task objects (`@spawn`, `@async`, etc.) now adopt the world-age for methods from their parent
Task upon creation, instead of using the global latest world at start. This is done to enable inference to
eventually optimize these calls. Places that wish for the old behavior may use `Base.invokelatest`. ([#41449])
* `@time` and `@timev` now take an optional description to allow annotating the source of time reports.
i.e. `@time "Evaluating foo" foo()` ([#42431])
* New `@showtime` macro to show both the line being evaluated and the `@time` report ([#42431])
* Iterating an `Iterators.Reverse` now falls back on reversing the eachindex interator, if possible ([#43110]).
* Unbalanced Unicode bidirectional formatting directives are now disallowed within strings and comments,
to mitigate the ["trojan source"](https://www.trojansource.codes) vulnerability ([#42918]).
Compiler/Runtime improvements
-----------------------------
* The LLVM-based compiler has been separated from the run-time library into a new library,
`libjulia-codegen`. It is loaded by default, so normal usage should see no changes.
In deployments that do not need the compiler (e.g. system images where all needed code
is precompiled), this library (and its LLVM dependency) can simply be excluded ([#41936]).
Command-line option changes
---------------------------
* New option `--strip-metadata` to remove docstrings, source location information, and local
variable names when building a system image ([#42513]).
* New option `--strip-ir` to remove the compiler's IR (intermediate representation) of source
code when building a system image. The resulting image will only work if `--compile=all` is
used, or if all needed code is precompiled ([#42925]).
Multi-threading changes
-----------------------
Build system changes
--------------------
New library functions
---------------------
* `hardlink(src, dst)` can be used to create hard links. ([#41639])
* `diskstat(path=pwd())` can be used to return statistics about the disk. ([#42248])
New library features
--------------------
* `@test_throws "some message" triggers_error()` can now be used to check whether the displayed error text
contains "some message" regardless of the specific exception type.
Regular expressions, lists of strings, and matching functions are also supported. ([#41888])
* `@testset foo()` can now be used to create a test set from a given function. The name of the test set
is the name of the called function. The called function can contain `@test` and other `@testset`
definitions, including to other function calls, while recording all intermediate test results. ([#42518])
* Keys with value `nothing` are now removed from the environment in `addenv` ([#43271]).
Standard library changes
------------------------
* `range` accepts either `stop` or `length` as a sole keyword argument ([#39241])
* `precision` and `setprecision` now accept a `base` keyword ([#42428]).
* The `length` function on certain ranges of certain specific element types no longer checks for integer
overflow in most cases. The new function `checked_length` is now available, which will try to use checked
arithmetic to error if the result may be wrapping. Or use a package such as SaferIntegers.jl when
constructing the range. ([#40382])
* TCP socket objects now expose `closewrite` functionality and support half-open mode usage ([#40783]).
* Intersect returns a result with the eltype of the type-promoted eltypes of the two inputs ([#41769]).
* `Iterators.countfrom` now accepts any type that defines `+`. ([#37747])
#### InteractiveUtils
* A new macro `@time_imports` for reporting any time spent importing packages and their dependencies ([#41612])
#### Package Manager
#### LinearAlgebra
* The BLAS submodule now supports the level-2 BLAS subroutine `spr!` ([#42830]).
* `cholesky[!]` now supports `LinearAlgebra.PivotingStrategy` (singleton type) values
as its optional `pivot` argument: the default is `cholesky(A, NoPivot())` (vs.
`cholesky(A, RowMaximum())`); the former `Val{true/false}`-based calls are deprecated. ([#41640])
#### Markdown
#### Printf
* Now uses `textwidth` for formatting `%s` and `%c` widths ([#41085]).
#### Profile
* Profiling now records sample metadata including thread and task. `Profile.print()` has a new `groupby` kwarg that allows
grouping by thread, task, or nested thread/task, task/thread, and `threads` and `tasks` kwargs to allow filtering.
Further, percent utilization is now reported as a total or per-thread, based on whether the thread is idle or not at
each sample. `Profile.fetch()` by default strips out the new metadata to ensure backwards compatibility with external
profiling data consumers, but can be included with the `include_meta` kwarg. ([#41742])
#### Random
#### REPL
* `RadioMenu` now supports optional `keybindings` to directly select options ([#41576]).
* ` ?(x, y` followed by TAB displays all methods that can be called
with arguments `x, y, ...`. (The space at the beginning prevents entering help-mode.)
`MyModule.?(x, y` limits the search to `MyModule`. TAB requires that at least one
argument have a type more specific than `Any`; use SHIFT-TAB instead of TAB
to allow any compatible methods.
* New `err` global variable in `Main` set when an expression throws an exception, akin to `ans`. Typing `err` reprints
the exception information.
#### SparseArrays
#### Dates
#### Downloads
#### Statistics
#### Sockets
#### Tar
#### Distributed
#### UUIDs
#### Mmap
#### DelimitedFiles
#### Logging
* The standard log levels `BelowMinLevel`, `Debug`, `Info`, `Warn`, `Error`,
and `AboveMaxLevel` are now exported from the Logging stdlib ([#40980]).
#### Unicode
* Added function `isequal_normalized` to check for Unicode equivalence without
explicitly constructing normalized strings ([#42493]).
* The `Unicode.normalize` function now accepts a `chartransform` keyword that can
be used to supply custom character mappings, and a `Unicode.julia_chartransform`
function is provided to reproduce the mapping used in identifier normalization
by the Julia parser ([#42561]).
Deprecated or removed
---------------------
External dependencies
---------------------
Tooling Improvements
---------------------
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