[issue1531415] parsetok.c emits warnings by writing to stderr

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

The C version of pgen is gone so the circular dependency should not be a problem as as far as I can tell, Parser/parsetok.c does not emit warnings anymore (the functions are unused). Maybe we should just clean that code instead.

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<https://bugs.python.org/issue1531415>
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