error[E0405]: cannot find trait `OuterTrait` in this scope --> $DIR/issue-21221-3.rs:15:6 | LL | impl OuterTrait for Foo {} | ^^^^^^^^^^ not found in this scope | help: consider importing this trait | LL + use issue_21221_3::outer::OuterTrait; | error: aborting due to previous error For more information about this error, try `rustc --explain E0405`.