error[E0271]: type mismatch resolving `<() as Super>::Assoc == ()` --> $DIR/projection-mismatch-in-impl-where-clause.rs:13:14 | LL | fn test() -> impl Test { | ^^^^^^^^^ type mismatch resolving `<() as Super>::Assoc == ()` | note: expected this to be `u8` --> $DIR/projection-mismatch-in-impl-where-clause.rs:6:18 | LL | type Assoc = u8; | ^^ note: required because of the requirements on the impl of `Test` for `()` --> $DIR/projection-mismatch-in-impl-where-clause.rs:11:9 | LL | impl Test for T where T: Super {} | ^^^^ ^ error: aborting due to previous error For more information about this error, try `rustc --explain E0271`.