PyCQA / pylint / 1010

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Check if a name is locally assigned when looking for used-before-assignment

If a name is locally assigned and there is another global name with the same variable, this can result in an UnboundLocalError, as seen in the following example:

  x = 24
  def test(a):
     if x == a:
           for x in [1, 2, 3]:
               print(x)
  test(24)

In this case, we should emit an ``used-before-assignment`` message. Closes #1081

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