| error[E0119]: conflicting implementations of trait `std::ops::Drop` for type `std::boxed::Box<_>`: |
| --> $DIR/issue-41974.rs:7:1 |
| | |
| LL | impl<T> Drop for T where T: A { |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| | |
| = note: conflicting implementation in crate `alloc`: |
| - impl<T> Drop for Box<T> |
| where T: ?Sized; |
| = note: downstream crates may implement trait `A` for type `std::boxed::Box<_>` |
| |
| error[E0120]: the `Drop` trait may only be implemented for structs, enums, and unions |
| --> $DIR/issue-41974.rs:7:18 |
| | |
| LL | impl<T> Drop for T where T: A { |
| | ^ must be a struct, enum, or union |
| |
| error[E0210]: type parameter `T` must be used as the type parameter for some local type (e.g., `MyStruct<T>`) |
| --> $DIR/issue-41974.rs:7:6 |
| | |
| LL | impl<T> Drop for T where T: A { |
| | ^ type parameter `T` 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 3 previous errors |
| |
| Some errors have detailed explanations: E0119, E0120, E0210. |
| For more information about an error, try `rustc --explain E0119`. |
