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Revision a9ccbcd5320a21645440238df269b04e41a2125f authored by moneta on 15 June 2020, 08:46:09 UTC, committed by moneta on 15 June 2020, 09:17:24 UTC 
Fix in TFormula the parsing of user defined functions which contain pre-defined functions (e.g. gaus) in their name. Fixes ROOT-10815.
 
For example when a user defines a function with the name "f1gaus" and then reuses that name could cause in same case an error parsing the expression.
Example :
```
TF1 f1("f1gaus","gaus");
TF1 f2("f2gaus","f1gaus+gaus(3)");
```
If the function name is for example  "fgaus" it was working before, but not if a character number is used before the pre-defined function name such as  "f1gaus".

Add also a test for parsing these cases in TFormulaParsingTest.

This commit fixes ROOT-10815
1 parent b6700a6
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