error[E0277]: the trait bound `cross_crate::NonConst: ~const cross_crate::MyTrait` is not satisfied --> $DIR/cross-crate.rs:17:5 | LL | NonConst.func(); | ^^^^^^^^ ---- required by a bound introduced by this call | | | the trait `~const cross_crate::MyTrait` is not implemented for `cross_crate::NonConst` | note: the trait `cross_crate::MyTrait` is implemented for `cross_crate::NonConst`, but that implementation is not `const` --> $DIR/cross-crate.rs:17:5 | LL | NonConst.func(); | ^^^^^^^^ help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement | LL | const fn const_context() where cross_crate::NonConst: ~const cross_crate::MyTrait { | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.