error[E0207]: the type parameter `U` is not constrained by the impl trait, self type, or predicates --> $DIR/impl-unused-tps.rs:13:8 | LL | impl<T,U> Foo<T> for [isize;1] { | ^ unconstrained type parameter error[E0207]: the type parameter `U` is not constrained by the impl trait, self type, or predicates --> $DIR/impl-unused-tps.rs:30:8 | LL | impl<T,U> Bar for T { | ^ unconstrained type parameter error[E0207]: the type parameter `U` is not constrained by the impl trait, self type, or predicates --> $DIR/impl-unused-tps.rs:38:8 | LL | impl<T,U> Bar for T | ^ unconstrained type parameter error[E0207]: the type parameter `U` is not constrained by the impl trait, self type, or predicates --> $DIR/impl-unused-tps.rs:46:8 | LL | impl<T,U,V> Foo<T> for T | ^ unconstrained type parameter error[E0207]: the type parameter `V` is not constrained by the impl trait, self type, or predicates --> $DIR/impl-unused-tps.rs:46:10 | LL | impl<T,U,V> Foo<T> for T | ^ unconstrained type parameter error: aborting due to 5 previous errors For more information about this error, try `rustc --explain E0207`.