File: issue-17999.stderr

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error: unused variable: `x`
  --> $DIR/issue-17999.rs:5:13
   |
LL |         let x = ();
   |             ^ help: if this is intentional, prefix it with an underscore: `_x`
   |
note: the lint level is defined here
  --> $DIR/issue-17999.rs:1:9
   |
LL | #![deny(unused_variables)]
   |         ^^^^^^^^^^^^^^^^

error: unused variable: `a`
  --> $DIR/issue-17999.rs:7:13
   |
LL |             a => {}
   |             ^ help: if this is intentional, prefix it with an underscore: `_a`

error: aborting due to 2 previous errors