E0027 needs to be updated to new format

[sophiajt]

From: src/test/compile-fail/E0027.rs

E0027 needs a span_label, taking it from:

error[E0027]: pattern does not mention field `name`
  --> src/test/compile-fail/E0027.rs:20:9
   |
20 |         Dog { age: x } => {} //~ ERROR E0027
   |         ^^^^^^^^^^^^^^

to:

error[E0027]: pattern does not mention field `name`
  --> src/test/compile-fail/E0027.rs:20:9
   |
20 |         Dog { age: x } => {} //~ ERROR E0027
   |         ^^^^^^^^^^^^^^ missing field `name`

[silenuss]

Ok, I'm finally sitting down to work on this.

[KiChjang]

This should be fixed by #35410.