error[E0277]: `Superset` cannot be safely transmuted into `Subset` in the defining scope of `assert::Context` --> $DIR/should_reject_contraction.rs:35:41 | LL | assert::is_transmutable::(); | ^^^^^^ At least one value of `Superset` isn't a bit-valid value of `Subset` | note: required by a bound in `is_transmutable` --> $DIR/should_reject_contraction.rs:13:14 | LL | pub fn is_transmutable() | --------------- required by a bound in this function LL | where LL | Dst: BikeshedIntrinsicFrom | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.