[issue5647] MutableSet.__iand__ implementation calls self.discard while iterating on self

[Matteo Dell'Amico]

Matteo Dell'Amico <de...@linux.it> added the comment:

I suggest solving the problem by changing the implementation to:

def __iand__(self, c):
    self -= self - c:

or to

def __iand__(self, c):
    for item in self - c:
        self.discard(item)

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<http://bugs.python.org/issue5647>
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