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warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/specialization-wfcheck.rs:3:12
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LL | #![feature(specialization)]
| ^^^^^^^^^^^^^^
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= note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
= help: consider using `min_specialization` instead, which is more stable and complete
= note: `#[warn(incomplete_features)]` on by default
error[E0277]: the trait bound `U: Eq` is not satisfied
--> $DIR/specialization-wfcheck.rs:7:17
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LL | default impl<U> Foo<'static, U> for () {}
| ^^^^^^^^^^^^^^^ the trait `Eq` is not implemented for `U`
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note: required by a bound in `Foo`
--> $DIR/specialization-wfcheck.rs:5:18
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LL | trait Foo<'a, T: Eq + 'a> { }
| ^^ required by this bound in `Foo`
help: consider restricting type parameter `U`
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LL | default impl<U: std::cmp::Eq> Foo<'static, U> for () {}
| ++++++++++++++
error: aborting due to previous error; 1 warning emitted
For more information about this error, try `rustc --explain E0277`.
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