error[E0277]: the trait bound `f32: Foo` is not satisfied --> $DIR/chalk_initial_program.rs:15:13 | LL | gimme::<f32>(); | ^^^ the trait `Foo` is not implemented for `f32` | = help: the following other types implement trait `Foo`: i32 u32 note: required by a bound in `gimme` --> $DIR/chalk_initial_program.rs:9:13 | LL | fn gimme<F: Foo>() { } | ^^^ required by this bound in `gimme` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.