Chance to improve "try ignoring the field" message

[nnethercote]

I got this error message recently:

error: unused variable: `kind`
   --> compiler/rustc_expand/src/mbe/macro_parser.rs:700:59
    |
700 |             if let &MatcherLoc::MetaVarDecl { span, bind, kind, .. } = loc {
    |                                                           ^^^^ help: try ignoring the field: `kind: _`
    |
    = note: `-D unused-variables` implied by `-D warnings`

kind: _ will work, but just removing kind completely from the pattern would be better.

E.g. the suggestion could be help: try removing the field.

The particular example was within rustc, but it should be very easy to replicate in a self-contained example.

[lameferret]

Is this [E0027]? Where does this suggestion come from? Can I please get the path for it!

[yuvaldolev]

@rustbot claim

[booleancoercion]

@yuvaldolev It's been 3 months - are you still working on this? If not, I'd like to claim it instead.

[GoldsteinE]

There was no activity for a while, so I took a liberty of implementing this.

@rustbot claim