Parametrized argument named similarly to fixture (contains it) breaks that fixture's parametrization

[pytestbot]

Originally reported by: Jacobo Giralt (BitBucket: jgiralt, GitHub: jgiralt)

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#!python

import pytest

@pytest.fixture(params=[1,2,3])
def foo(request):
    return request.param

@pytest.mark.parametrize('foobar', [4,5,6])
def test_issue(foo, foobar):
    assert True

#!python

request = <SubRequest 'foo' for <Function 'test_issue[4]'>>

    @pytest.fixture(params=[1,2,3])
    def foo(request):
>       return request.param
AttributeError: SubRequest instance has no attribute 'param'

The issue seems reproducible as long as the parametrized test argument contains the fixture name as a substring, e.g. foobar, barfoo, foox, xfoo, disappears as soon as I modify the fixture name to anything else.

This same code works in pytest-2.6.4 and fails for 2.7.

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/736