| error[E0117]: only traits defined in the current crate can be implemented for arbitrary types | |
| --> $DIR/complex-impl.rs:9:1 | |
| | | |
| LL | impl<R> External for (Q, R) {} | |
| | ^^^^^^^^^^^^^^^^^^^^^------ | |
| | | | |
| | this is not defined in the current crate because tuples are always foreign | |
| | | |
| = note: impl doesn't have any local type before any uncovered type parameters | |
| = note: for more information see https://doc.rust-lang.org/reference/items/implementations.html#orphan-rules | |
| = note: define and implement a trait or new type instead | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0117`. |