1 warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
2 --> $DIR/issue-50452-fail.rs:1:12
4 LL | #![feature(specialization)]
7 = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
8 = help: consider using `min_specialization` instead, which is more stable and complete
9 = note: `#[warn(incomplete_features)]` on by default
11 error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
12 --> $DIR/issue-50452-fail.rs:10:5
15 | ^^^^^^^^^^^ cannot specialize default item `foo`
17 LL | impl<T> Foo for T {
18 | ----------------- parent `impl` is here
20 = note: to specialize, `foo` in the parent `impl` must be marked `default`
22 error: aborting due to previous error; 1 warning emitted
24 For more information about this error, try `rustc --explain E0520`.