Scope lookup problem when using closures

[pylint-bot]

Originally reported by: Claudiu Popa (BitBucket: PCManticore, GitHub: @PCManticore)

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Given the following code, astroid doesn't understand the fact that the result will always be 24, instead it returns an union between the global and the value from the enclosing scope.

#!python

from astroid.test_utils import extract_node
n = extract_node('''
next = 42
def wrapper(next=next):     
     next = 24
     def test():
         return next
     return test
wrapper()() #@
''')
f = n.inferred()
print(f)
print(f[0].value)

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• Bitbucket: https://bitbucket.org/logilab/astroid/issue/180