Implement suggestions for traits to import.#21008

Merged

bors merged 3 commits intorust-lang:masterfrom

huonw:trait-suggestions

Jan 17, 2015

Commits on Jan 13, 2015

typeck: move method errors/suggestions to their own file.
huonw
committed

Commits on Jan 14, 2015

Implement suggestions for traits to import.
huonw
committed

Commits on Jan 16, 2015

Prefer implemented traits in suggestions.
huonw
committed