[issue10544] yield expression inside generator expression does nothing

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Note that the DeprecationWarning exception is replaced with a SyntaxError to get a more accurate error report.

$ cat yield-gen.py 
def f():
    return ((yield x) for x in range(3))

$ ./python -Wd yield-gen.py
yield-gen.py:2: DeprecationWarning: 'yield' inside generator expression
  return ((yield x) for x in range(3))

$ ./python -We yield-gen.py
  File "yield-gen.py", line 2
    return ((yield x) for x in range(3))
           ^
SyntaxError: 'yield' inside generator expression


Without this replacement the result would be:

$ ./python -We yield-gen.py
DeprecationWarning: 'yield' inside generator expression

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<https://bugs.python.org/issue10544>
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