[issue21591] "exec(a, b, c)" not the same as "exec a in b, c" in nested functions

[Guido van Rossum]

Guido van Rossum added the comment:

This does appear to be a bug. Please research the C code that originates the error message -- there's probably a simple logic mistake.

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nosy: +gvanrossum

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<http://bugs.python.org/issue21591>
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