error[E0433]: failed to resolve: could not find `nonexistent` in `existent` --> $DIR/custom-attribute-multisegment.rs:5:13 | LL | #[existent::nonexistent] | ^^^^^^^^^^^ could not find `nonexistent` in `existent` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0433`.