haskell/containers — pull request #42 by k-bx (2014-04-13 22:01:10+00:00)
Title: Add LANGUAGE RoleAnnotations for ghc 7.8

As I understand, this was missing. I had error

```
Data/Set/Base.hs:239:1:
Illegal role annotation for Set;
did you intend to use RoleAnnotations?
while checking a role annotation for `Set'
```

when trying to run `cabal test` on master.