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

[Nick Coghlan]

Nick Coghlan added the comment:

Agreed reverting isn't necessary - main thing is to figure out what went wrong in the py test suite and come up with a new test case that covers it.

The reason I suspect it's the missing runtime check that's causing the py problem is because (as far as I am aware), Jinja2 generates AST constructs directly and compiles those, and thus may be relying on the runtime check. It's just a theory, though.

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