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warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/issue-38091.rs:1:12
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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 `(): Valid` is not satisfied
--> $DIR/issue-38091.rs:12:23
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LL | default type Ty = ();
| ^^ the trait `Valid` is not implemented for `()`
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help: this trait has no implementations, consider adding one
--> $DIR/issue-38091.rs:20:1
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LL | trait Valid {}
| ^^^^^^^^^^^
note: required by a bound in `Iterate::Ty`
--> $DIR/issue-38091.rs:5:14
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LL | type Ty: Valid;
| ^^^^^ required by this bound in `Iterate::Ty`
error: aborting due to previous error; 1 warning emitted
For more information about this error, try `rustc --explain E0277`.
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