error: unreachable pattern
  --> $DIR/issue-57472.rs:15:13
   |
LL |             Punned { bar: [_], .. } => println!("bar"),
   |             ^^^^^^^^^^^^^^^^^^^^^^^
   |
note: lint level defined here
  --> $DIR/issue-57472.rs:2:9
   |
LL | #![deny(unreachable_patterns)]
   |         ^^^^^^^^^^^^^^^^^^^^

error: unreachable pattern
  --> $DIR/issue-57472.rs:31:13
   |
LL |             Punned { bar: [_] } => println!("bar"),
   |             ^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors