Suggest replacing an inexisting field for an unmentioned field

[hkmatsumoto]

Fix #87938

This PR adds a suggestion to replace an inexisting field for an
unmentioned field. Given the following code:

enum Foo {
    Bar { alpha: u8, bravo: u8, charlie: u8 },
}

fn foo(foo: Foo) {
    match foo {
        Foo::Bar {
            alpha,
            beta, // `bravo` miswritten as `beta` here.
            charlie,
        } => todo!(),
    }
}

the compiler now emits the error messages below.

error[E0026]: variant `Foo::Bar` does not have a field named `beta`
 --> src/lib.rs:9:13
  |
9 |             beta, // `bravo` miswritten as `beta` here.
  |             ^^^^
  |             |
  |             variant `Foo::Bar` does not have this field
  |             help: `Foo::Bar` has a field named `bravo`: `bravo`

Note that this suggestion is available iff the number of inexisting
fields and unmentioned fields are both 1.

[rust-highfive]

r? @LeSeulArtichaut

(rust-highfive has picked a reviewer for you, use r? to override)

[LeSeulArtichaut]

Thanks for the PR, and sorry for the delay on my part. I have a few minor comments.

[LeSeulArtichaut]

r? @estebank who will have a much better idea of what the best diagnostics are

[estebank]

Please squash your commits. Then we can merge this :)

[estebank]

@bors r+ rollup

[bors]

📌 Commit 37196e3 has been approved by estebank