Wrong fix is suggested when `renamed` is unused in `MyStruct { y: renamed }`

[poliorcetics]

Given the following code (playground link):

struct Point {
    x: u32,
    y: u32
}

fn process_point(Point { x, y: renamed }: Point) {
    /* ... */
}

The current warning output is (ignoring non-relevant parts):

warning: unused variable: `renamed`
 --> src/lib.rs:6:32
  |
6 | fn process_point(Point { x, y: renamed }: Point) {
  |                                ^^^^^^^ help: try ignoring the field: `renamed: _`

Ideally the output should look like:

  |
6 | fn process_point(Point { x, y: renamed }: Point) {
  |                                ^^^^^^^ help: try ignoring the field: `y: _`

because using y: renamed: _ does not work (of course).

Using cargo fix is broken by this too, I got the following message (removing the big message about making a bug report to remove clutter):

✖ cg fix --allow-no-vcs  
    Checking playground v0.1.0 (/Users/alexis/Projects/rust/playground)
warning: failed to automatically apply fixes suggested by rustc to crate `playground`

after fixes were automatically applied the compiler reported errors within these files:

  * src/main.rs

The following errors were reported:
error: expected `,`
  --> src/main.rs:18:46
   |
18 |     fn process_point(Point { x: _, y: renamed: _ }: Point) { /* ... */ }
   |                      -----                   ^
   |                      |
   |                      while parsing the fields for this pattern

error: aborting due to previous error

...

@rustbot label A-diagnostics C-bug D-incorrect D-invalid-suggestion