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warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/specialization-default-types.rs:9:12
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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[E0308]: mismatched types
--> $DIR/specialization-default-types.rs:19:9
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LL | default type Output = Box<T>;
| ------------------- associated type is `default` and may be overridden
LL | default fn generate(self) -> Self::Output {
| ------------ expected `<T as Example>::Output` because of return type
LL | Box::new(self)
| ^^^^^^^^^^^^^^ types differ
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= note: expected associated type `<T as Example>::Output`
found struct `Box<T>`
error[E0308]: mismatched types
--> $DIR/specialization-default-types.rs:29:5
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LL | fn trouble<T>(t: T) -> Box<T> {
| ------ expected `Box<T>` because of return type
LL | Example::generate(t)
| ^^^^^^^^^^^^^^^^^^^^ types differ
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= note: expected struct `Box<T>`
found associated type `<T as Example>::Output`
= help: consider constraining the associated type `<T as Example>::Output` to `Box<T>`
= note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
error: aborting due to 2 previous errors; 1 warning emitted
For more information about this error, try `rustc --explain E0308`.
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