New issue 507: pytest-2.5.2: Assertion breaks with dictionary comprehention
https://bitbucket.org/hpk42/pytest/issue/507/pytest-252-assertion-breaks-with
Matthew Story:
In version 2.5.2 assertions break when you use a comprehension on one side of
the comparison:
```
def assert_subsetof(d1, d2):
'''Assert d1 is a subset of d2, with equal values for all defined
keys'''
> assert {k:d2[k] for k in d1 if d2.has_key(k)} == d1
E AssertionError: NameError: << global name 'd2' is not defined
/usr/axm/lib/python2.7/site-packages/apitests/assertions.py:4: AssertionError
```
When writing in pure python, the same operation works fine:
```
#!python
>>> def foo(d1, d2):
... assert {k:d2[k] for k in d1 if d2.has_key(k)} == d1
...
>>> foo({'a': 'b'}, {'a': 'b', 'b': 'c'})
```
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