| error[E0210]: type parameter `Foo` must be used as the type parameter for some local type (e.g., `MyStruct<Foo>`) |
| --> $DIR/issue-28981.rs:5:6 |
| | |
| LL | impl<Foo> Deref for Foo { } |
| | ^^^ type parameter `Foo` must be used as the type parameter for some local type |
| | |
| = note: implementing a foreign trait is only possible if at least one of the types for which it is implemented is local |
| = note: only traits defined in the current crate can be implemented for a type parameter |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0210`. |
