error[E0277]: the trait bound `(): Foo` is not satisfied --> $DIR/exhaustive-value.rs:262:6 | LL | <() as Foo>::test() | ^^ the trait `Foo` is not implemented for `()` | = help: the following other types implement trait `Foo`: <() as Foo<0>> <() as Foo<100>> <() as Foo<101>> <() as Foo<102>> <() as Foo<103>> <() as Foo<104>> <() as Foo<105>> <() as Foo<106>> and 248 others error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.