UnboundLocalError in assertion rewriting

[pytestbot]

Originally reported by: Michał Bartoszkiewicz (BitBucket: embe, GitHub: embe)

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This code:

#!python
def test_rewrite():
    f = lambda: False
    assert f() and f()

causes

UnboundLocalError: local variable '@py_assert6' referenced before assignment

when run with assertion rewriting.

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/69

[pytestbot]

Original comment by Benjamin Peterson (BitBucket: gutworth, GitHub: gutworth):

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every boolop operand must have it's own format context (fixes #69)