[Cython] Pyregr regressions

[Vitja Makarov]

Hi!

Recent commits to the master introduced pyregr regressions. You can
see it here, just sort by age:

https://sage.math.washington.edu:8091/hudson/job/cython-devel-tests-pyregr/BACKEND=c,PYVERSION=py27/33/testReport/

Here is one example:
======================================================================
ERROR: runTest (__main__.CythonPyregrTestCase)
compiling (c) and running test_pipes
----------------------------------------------------------------------
Traceback (most recent call last):
  File "runtests.py", line 679, in run
    self.runCompileTest()
  File "runtests.py", line 491, in runCompileTest
    self.test_directory, self.expect_errors, self.annotate)
  File "runtests.py", line 656, in compile
    self.assertEquals(None, unexpected_error)
AssertionError: None != u"39:14: Object of type '<unspecified>' has no
attribute 'open'"


May be it's a good idea to check for pyregr regressions as well as for
regular tests failures before merging into master?

-- 
vitja.