Fix "-> Type" on a single line indentation

[strega-nil]

Plus a few minor spelling changes in comments

Fixes #8

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @nikomatsakis (or someone else) soon.

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[strega-nil]

Can I just say thank you to the people who wrote this? Incredibly well commented, easy to edit, awesomeness.

[quantheory]

Ah! This is definitely an improvement. I find that there are a lot of other cases where indentation is at least somewhat strange in rust-mode, which is perhaps an argument for switching to a more "tried and true" way of dealing with indentation, e.g. based on SMIE. (To see what I mean, find a random if statement with a moderately complex condition, where the { is after the condition rather than on a line by itself, and insert a newline between any random pair of tokens, then reindent the block. This will almost certainly shift the indentation of the entire if block to the right. Several other types of expression are similarly fragile to users adding newlines in "unexpected" places.)

Nevertheless, this PR works around one of the most common bad cases, so it is still quite helpful.

[strega-nil]

Yes, we can work on the rest of the indentation issues later, this is just an issue that I had that was an easy fix.

[strega-nil]

@quantheory I'm setting up a new repo in order to work on an SMIE grammar for Rust. Would you like to join me? (I've never done any SMIE work before (and in fact, am an Emacs newbie), so I'd like someone who actually knows what they're doing. Check out the repo.

[quantheory]

@GBGamer I would, but I'm afraid I am really the wrong person to ask. I actually only have a dimly-remembered mental picture of how SMIE works from several years back, and I'm pretty overextended in any case. I really only check in here because I like to whine hope that some of the quirks in the current rust-mode will get ironed out soon.

[strega-nil]

Pinging @nikomatsakis

[pnkfelix]

Okay, normally I'd say "please add a test case."

But I want this badly enough that I'm probably going to just merge it. (I just want to quickly double-check myself that it behaves as advertised -- if so, then I'll merge it and then work on a test case myself.)

[pnkfelix]

Yes, awesome, it fixes both of my most important cases:

    fn foo(a: i32)
           -> i32 {
               // whoops
           }

    fn foo<T>(a: i32)
              -> i32 where T:Foo {
                  // bad too
              }

[strega-nil]

@pnkfelix Thanks for the regression test, I didn't even think about that 😝