Commits on Sep 13, 2021

1. Suggest replacing an inexisting field for an unmentioned field …

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

   

   hkmatsumoto committed Sep 13, 2021
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