1 error[E0277]: the trait bound `(): T` is not satisfied
2 --> $DIR/impl_trait_fallback4.rs:13:13
4 LL | fn foo() -> impl T {
5 | ^^^^^^ the trait `T` is not implemented for `()`
7 error: aborting due to previous error
9 For more information about this error, try `rustc --explain E0277`.