assert reinterpretation fails for some code layouts

[pytestbot]

Originally reported by: Ronny Pfannschmidt (BitBucket: RonnyPfannschmidt, GitHub: RonnyPfannschmidt)

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the code example is

#!python

def test_assert():
    result = None
    assert result == [
        (None, [ 'some text\n', 'more text\n']),
    ]

the given output is

$ py.test test_assert.py 
============================= test session starts ==============================
platform linux2 -- Python 2.6.6 -- pytest-2.0.0dev0
test path 1: test_assert.py

test_assert.py F

=================================== FAILURES ===================================
_________________________________ test_assert __________________________________

    def test_assert():
        result = None
        assert result == [
>           (None, [ 'some text\n', 'more text\n']),
E           AssertionError: (assertion failed, but when it was re-run for printing intermediate values, it did not fail.  Suggestions: compute assert expression before the assert or use --no-assert)

test_assert.py:5: AssertionError
=========================== 1 failed in 0.20 seconds ===========================

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/1

[pytestbot]

Original comment by Ronny Pfannschmidt (BitBucket: RonnyPfannschmidt, GitHub: RonnyPfannschmidt):

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note

• this works fine with the old assertion code (thats used on python without ast)
• putting the list into a variable and using that in the assertion works as well

[pytestbot]

Original comment by holger krekel (BitBucket: hpk42, GitHub: hpk42):

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think this is fixed now in py-1.4.0.dev3 with an improved heuristic (and don't think this used to work for the old assertion code but maybe i am missing something).