error[E0433]: cannot find module or crate `aaa` in this scope
  --> $DIR/unresolved-module-error-33293.rs:4:9
   |
LL |         aaa::bbb(_) => ()
   |         ^^^ use of unresolved module or unlinked crate `aaa`
   |
   = help: you might be missing a crate named `aaa`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0433`.
