[Haskell-cafe] Human-friendly compiler errors for GHC

[Evan Laforge]

> What do you think about this feature? Would it be genuinely helpful or annoying?

It could be handy if it understands qualified names.  Occasionally
typos e.g. just now Confg.default_x are surprisingly hard to see and I
go around making sure Config is imported, making sure it exports
default_x, etc. before finally figuring it out.