error[E0277]: the trait bound `Bar: Eq` is not satisfied --> $DIR/where-clauses-method-unsatisfied.rs:18:7 | LL | x.equals(&x); | ^^^^^^ the trait `Eq` is not implemented for `Bar` | note: required by a bound in `Foo::::equals` --> $DIR/where-clauses-method-unsatisfied.rs:11:52 | LL | fn equals(&self, u: &Foo) -> bool where T : Eq { | ^^ required by this bound in `Foo::::equals` help: consider annotating `Bar` with `#[derive(Eq)]` | LL + #[derive(Eq)] LL | struct Bar; // does not implement Eq | error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.