error[E0277]: the trait bound `T: ~const Sup` is not satisfied --> $DIR/specializing-constness-2.rs:27:5 | LL | <T as A>::a(); | ^^^^^^^^^^^^^ the trait `~const Sup` is not implemented for `T` | note: required for `T` to implement `~const A` --> $DIR/specializing-constness-2.rs:20:37 | LL | impl<T: Default + ~const Sup> const A for T { | ---------- ^ ^ | | | unsatisfied trait bound introduced here help: consider further restricting this bound | LL | const fn generic<T: Default + ~const Sup>() { | ++++++++++++ error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.