error[E0277]: the trait bound `S: Hidden` is not satisfied --> $DIR/sealed-trait-local.rs:17:20 | LL | impl a::Sealed for S {} | ^ the trait `Hidden` is not implemented for `S` | note: required by a bound in `Sealed` --> $DIR/sealed-trait-local.rs:3:23 | LL | pub trait Sealed: self::b::Hidden { | ^^^^^^^^^^^^^^^ required by this bound in `Sealed` = note: `Sealed` is a "sealed trait", because to implement it you also need to implement `a::b::Hidden`, which is not accessible; this is usually done to force you to use one of the provided types that already implement it error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.