[issue40716] Pegen: improve error messages for unparenthesized from imports with trailing comma

[Batuhan Taskaya]

New submission from Batuhan Taskaya <isidentical at gmail.com>:

$ python
Python 3.10.0a0 (heads/bpo-xxxxx:f2947e354c, May 21 2020, 18:54:57) 
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from x import y,
  File "<stdin>", line 1
    from x import y,
                    ^
SyntaxError: invalid syntax
>>> 
(.venv) (Python 3.10.0a0) [  8:44ÖS ]  [ isidentical at x200:~/cpython/cpython(bpo-xxxxx✗) ]
 $ python -X oldparser
Python 3.10.0a0 (heads/bpo-xxxxx:f2947e354c, May 21 2020, 18:54:57) 
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from x import y,
  File "<stdin>", line 1
SyntaxError: trailing comma not allowed without surrounding parentheses

----------
messages: 369530
nosy: BTaskaya
priority: normal
severity: normal
status: open
title: Pegen: improve error messages for unparenthesized from imports with trailing comma

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40716>
_______________________________________