1 error[E0119]: conflicting implementations of trait `std::ops::Deref` for type `&_`:
2 --> $DIR/issue-28981.rs:15:1
4 LL | impl<Foo> Deref for Foo { } //~ ERROR must be used
5 | ^^^^^^^^^^^^^^^^^^^^^^^
7 = note: conflicting implementation in crate `core`:
8 - impl<T> std::ops::Deref for &T
11 error[E0210]: type parameter `Foo` must be used as the type parameter for some local type (e.g., `MyStruct<Foo>`)
12 --> $DIR/issue-28981.rs:15:1
14 LL | impl<Foo> Deref for Foo { } //~ ERROR must be used
15 | ^^^^^^^^^^^^^^^^^^^^^^^ type parameter `Foo` must be used as the type parameter for some local type
17 = note: only traits defined in the current crate can be implemented for a type parameter
19 error: aborting due to 2 previous errors
21 Some errors occurred: E0119, E0210.
22 For more information about an error, try `rustc --explain E0119`.