error[E0412]: cannot find type `Dst` in this scope --> $DIR/unknown_dst.rs:20:36 | LL | fn should_gracefully_handle_unknown_dst() { | - help: you might be missing a type parameter: `` ... LL | assert::is_transmutable::(); | ^^^ not found in this scope error: aborting due to previous error For more information about this error, try `rustc --explain E0412`.