emacs mode indentation is wrong when function return -> is on its own line

[nikomatsakis]

The following code indents as shown here, which is weird:

pub fn from_pointer_kind(base_mutbl: MutabilityCategory,
                         ptr: PointerKind)
                         -> MutabilityCategory {
                             match ptr {
                             }
                         }

I expect it to be:

pub fn from_pointer_kind(base_mutbl: MutabilityCategory,
                         ptr: PointerKind)
                         -> MutabilityCategory {
    match ptr {
    }
}

[nikomatsakis]

cc @pnkfelix @ruediger

[ruediger]

Since you cc'ed me: I didn't really look at the indentation code. I think it would be best to throw it out and use GNU Emacs' SMIE instead. But I currently don't have the time or inside knowledge of the rust syntax to work on that. See (info "(elisp) SMIE").

[nikomatsakis]

@ruediger I've no opinion about this. Our current indentation setup seems to work pretty well, but it certainly has a few minor flaws, and maybe rebasing atop SMIE might be better.

[huonw]

cc #8793

[steveklabnik]

Moved to rust-lang/rust-mode#8