error[E0277]: the trait bound `u8: Foo` is not satisfied --> $DIR/feature-gate-do_not_recommend.rs:19:11 | LL | stuff(1u8); | ----- ^^^ the trait `Foo` is not implemented for `u8` | | | required by a bound introduced by this call | = help: the trait `Foo` is implemented for `i32` note: required for `u8` to implement `Bar` --> $DIR/feature-gate-do_not_recommend.rs:13:14 | LL | impl Bar for T { | --- ^^^ ^ | | | unsatisfied trait bound introduced here note: required by a bound in `stuff` --> $DIR/feature-gate-do_not_recommend.rs:16:13 | LL | fn stuff(_: T) {} | ^^^ required by this bound in `stuff` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.