| error[E0128]: generic parameter defaults cannot reference parameters before they are declared | |
| --> $DIR/E0128.rs:1:14 | |
| | | |
| LL | struct Foo<T=U, U=()> { | |
| | ^ cannot reference `U` before it is declared | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0128`. |