It seems setuptools v36.2.0 changed the behavior of {package}.egg-info/requires.txt generation. I suspect this was introduced by #1081. We saw this in pbr as it broke our unit tests. We have since fixed this, but ideally this behavior shouldn't have changed in a minor release.

I don't want to revert that change but I also would like this behavior to remain as consistent as possible (for as long as requires.txt files are used, anyway). I can work on a test to ensure this is the case.