[issue27999] Make "global after use" a SyntaxError

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

I am attaching the patch.

Yury, I also added you here, just in case you have time for this.

Btw, while working on this I have found that the second restriction:

"""
Names listed in a global statement must not be ... in a for loop control target, class definition, function definition, or import statement.
"""

is not enforced at all, it does not give even a SyntaxWarning.
Is it something worth fixing?

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keywords: +patch
nosy: +yselivanov
Added file: http://bugs.python.org/file44501/patch-v1.diff

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