| error[E0308]: mismatched types | |
| --> $DIR/illegal-upcast-from-impl.rs:16:66 | |
| | | |
| LL | fn illegal(x: &dyn Sub<Assoc = ()>) -> &dyn Super<Assoc = i32> { x } | |
| | ----------------------- ^ expected trait `Super`, found trait `Sub` | |
| | | | |
| | expected `&dyn Super<Assoc = i32>` because of return type | |
| | | |
| = note: expected reference `&dyn Super<Assoc = i32>` | |
| found reference `&dyn Sub<Assoc = ()>` | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0308`. |