Add test for https://github.com/cython/cython/pull/507
Add test for https://github.com/cython/cython/pull/507

Strangely enough, this test compiles, but I am able to reproduce this
error outside the testing environment.  Still worth having here.

fabianrost84/cython,fabianrost84/cython,ChristopherHogan/cython,scoder/cython,da-woods/cython,fabianrost84/cython,da-woods/cython,cython/cython,ChristopherHogan/cython,cython/cython,scoder/cython,da-woods/cython,cython/cython,ChristopherHogan/cython,scoder/cython,da-woods/cython,fabianrost84/cython,scoder/cython,fabianrost84/cython,cython/cython