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error: unused return value of `foo` that must be used
  --> $DIR/must_use-unit.rs:13:5
   |
LL |     foo();
   |     ^^^^^
   |
note: the lint level is defined here
  --> $DIR/must_use-unit.rs:2:9
   |
LL | #![deny(unused_must_use)]
   |         ^^^^^^^^^^^^^^^
help: use `let _ = ...` to ignore the resulting value
   |
LL |     let _ = foo();
   |     +++++++

error: unused return value of `bar` that must be used
  --> $DIR/must_use-unit.rs:15:5
   |
LL |     bar();
   |     ^^^^^
   |
help: use `let _ = ...` to ignore the resulting value
   |
LL |     let _ = bar();
   |     +++++++

error: aborting due to 2 previous errors