error: unreachable pattern
  --> $DIR/issue-30240-b.rs:12:9
   |
LL |         "hello" => {} //~ ERROR unreachable pattern
   |         ^^^^^^^
   |
note: lint level defined here
  --> $DIR/issue-30240-b.rs:1:9
   |
LL | #![deny(unreachable_patterns)]
   |         ^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error