error[E0392]: parameter `T` is never used | |
--> $DIR/issue-17904-2.rs:4:12 | |
| | |
LL | struct Foo<T> where T: Copy; | |
| ^ unused parameter | |
| | |
= help: consider removing `T`, referring to it in a field, or using a marker such as `std::marker::PhantomData` | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0392`. |