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warning: external crate `bar` unused in `warn_attr`: remove the dependency or add `use bar as _;`
  --> $DIR/warn-attr.rs:7:1
   |
LL | #![warn(unused_crate_dependencies)]
   | ^
   |
note: the lint level is defined here
  --> $DIR/warn-attr.rs:7:9
   |
LL | #![warn(unused_crate_dependencies)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^

warning: 1 warning emitted