rust-lang/rust — pull request #18144 by bkoropoff (2014-10-18 23:13:30+00:00)
Title: Fix monomorphization of unboxed closures

This allows unboxed closures that reference free type/region parameters to be monomorphized correctly in trans.

It was necessary to make `ty_unboxed_closure` carry around a `Substs` to accomplish this. Plumbing this through typeck revealed several areas where type/region parameters in unboxed closure types are possibly not being handled correctly. Since my goal was just to fix trans, I decided to leave FIXME comments on areas that still need attention and seek feedback on the best way to clean them up, possibly as a follow-up PR.