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Mon Nov 13 10:56:03 EST 2017 · http://mail.python.org/pipermail/python-dev/2017-November/150512.html

FWIW, it is common to have syntax checks in ast.c.
Especially situations like class ``C(x for x in [1]): ...`` I think would
be hard to prohibit in Grammar.
Since anyway we have many checks in ast.c already, I wouldn't care much
about implementing these corner cases in Grammar.

--
Ivan
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[Python-Dev] Disallow ambiguous syntax f(x for x in [1],)