error[E0433]: failed to resolve: use of undeclared crate or module `foo` --> $DIR/export-fully-qualified-2018.rs:8:20 | LL | pub fn bar() { foo::baz(); } | ^^^ use of undeclared crate or module `foo` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0433`.