[issue32012] Disallow ambiguous syntax f(x for x in [1],)

[Serhiy Storchaka]

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

Stefan, `[1,2,3]` is an expression, but `x for x in [1,2,3]` is not. If you want to change the Python language specification, please open a topic on Python-Dev and provide the rationale.

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<https://bugs.python.org/issue32012>
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