1 error[E0119]: conflicting implementations of trait `std::ops::Drop` for type `std::boxed::Box<_>`:
2 --> $DIR/issue-41974.rs:17:1
4 LL | impl<T> Drop for T where T: A { //~ ERROR E0119
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
7 = note: conflicting implementation in crate `alloc`:
8 - impl<T> std::ops::Drop for std::boxed::Box<T>
10 = note: downstream crates may implement trait `A` for type `std::boxed::Box<_>`
12 error[E0120]: the Drop trait may only be implemented on structures
13 --> $DIR/issue-41974.rs:17:18
15 LL | impl<T> Drop for T where T: A { //~ ERROR E0119
16 | ^ implementing Drop requires a struct
18 error[E0210]: type parameter `T` must be used as the type parameter for some local type (e.g., `MyStruct<T>`)
19 --> $DIR/issue-41974.rs:17:1
21 LL | impl<T> Drop for T where T: A { //~ ERROR E0119
22 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type parameter `T` must be used as the type parameter for some local type
24 = note: only traits defined in the current crate can be implemented for a type parameter
26 error: aborting due to 3 previous errors
28 Some errors occurred: E0119, E0120, E0210.
29 For more information about an error, try `rustc --explain E0119`.