Add get-type command

[TedDriggs]

The get-type command (requested in #620) takes a line and character number which point to a complete identifier in the input text. The command will then attempt to determine the concrete type of that identifier.

Note that this also includes the travis updates from #728; this was necessary to make CI pass.

[MadRubicant]

Is there any reason this PR hasn't been merged?

[kngwyu]

@MadRubicant Simply it needs rebasing, and I'm not sure it's so useful for clients. But if you need this feature, I'm going to work on this.

[MadRubicant]

I don't specifically need this feature; I was hoping it would let me hack together completion for closures. I cloned the branch to test it, and trying to get the type of a closure argument causes a panic

[kngwyu]

@MadRubicant Then this branch is too old to hack :worried: I added support for closure arg in https://github.com/racer-rust/racer/pull/867, but it needs type annotation :tired_face: Any contribution for enhancement is welcome, but please use the latest mater branch :slightly_smiling_face:

[shinzui]

I would love to have this feature. I have to resort to hacks to get the type of a variable in neovim now.

[kngwyu]

@shinzui Thanks for feedback. I assigned myself.

[Baranowski]

Hi @kngwyu, has there been any progress on this feature?

I got super excited when I saw this PR, and then I realized how old it was. I would be happy to try to rebase/rewrite it on top of master, if nobody else is working on this and if this functionality is not supplied somewhere else (e.g. rustc).

[kngwyu]

@Baranowski Sorry, I'm not so active in this project now. It's great if you want to work for this PR, though there are some other active projects like rust-analyzer.