error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates | |
--> $DIR/impl-with-unconstrained-param.rs:14:6 | |
| | |
LL | impl<T> X for () { | |
| ^ unconstrained type parameter | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0207`. |