Feature: use path assistance

[birkenfeld]

It would be interesting to have a way to ask Racer "what module/submodule do I have to use to get HashMap"?

The next step, actually inserting the use statement in a file, is probably not within Racer's mission statement, but it can be added to the editor specific code.

[phildawes]

Hi @birkenfeld. I agree, this would be a cool feature.

BTW, I think inserting the use statement is absolutely in Racer's mission - one of the reasons I'm interested in getting better rustc based type and lifetime inference is to be able to perform accurate code transformations like adding imports, renaming items, extracting functions etc..