sass/sass-spec — pull request #73 by malrase (2014-10-07 16:58:12+00:00)
Title: Adding a test for sass/libsass#152 whereby interpolating percentages ...

...don't work.

See issue here:
https://github.com/sass/libsass/issues/152

And breaking gist here:
http://sassmeister.com/gist/dfce2bcccbe3799ba98c