warning: external crate `barbar` unused in `unused_aliases`: remove the dependency or add `use barbar as _;`
  --> $DIR/unused-aliases.rs:8:1
   |
LL | #![warn(unused_crate_dependencies)]
   | ^
   |
note: the lint level is defined here
  --> $DIR/unused-aliases.rs:8:9
   |
LL | #![warn(unused_crate_dependencies)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^

warning: 1 warning emitted