D-Programming-Language/dmd — pull request #1445 by AndrejMitrovic (2013-01-08 22:11:37+00:00)
Title: Issue 7829 - Function traits should be usable with subtyping

http://d.puremagic.com/issues/show_bug.cgi?id=7829

Perhaps this should also apply to some other traits, for now I've included only function traits.