mozilla/rust — pull request #13424 by eddyb (2014-04-09 12:39:16+00:00)
Title: Move mutability from ty_vec and ty_trait to their respective stores.

Cleans up some remnants of the old mutability system and only allows vector/trait mutability in `VstoreSlice` (`&mut [T]`) and `RegionTraitStore` (`&mut Trait`).