| error[E0128]: type parameters with a default cannot use forward declared identifiers | |
| --> $DIR/E0128.rs:1:14 | |
| | | |
| LL | struct Foo<T=U, U=()> { //~ ERROR E0128 | |
| | ^ defaulted type parameters cannot be forward declared | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0128`. |