auto merge of #17880 : pcwalton/rust/duplicate-bindings-in-parameter-list, r=alexcrichton

parameter list.

This breaks code like:

    fn f(a: int, a: int) { ... }
    fn g<T,T>(a: T) { ... }

Change this code to not use the same name for a parameter. For example:

    fn f(a: int, b: int) { ... }
    fn g<T,U>(a: T) { ... }

Code like this is *not* affected, since `_` is not an identifier:

    fn f(_: int, _: int) { ... } // OK

Closes #17568.

r? @alexcrichton 
[breaking-change]

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