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error[E0404]: expected trait, found derive macro `Hash`
--> $DIR/issue-37534.rs:1:16
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LL | struct Foo<T: ?Hash> { }
| ^^^^ not a trait
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help: consider importing this trait instead
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LL | use std::hash::Hash;
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warning: default bound relaxed for a type parameter, but this does nothing because the given bound is not a default; only `?Sized` is supported
--> $DIR/issue-37534.rs:1:12
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LL | struct Foo<T: ?Hash> { }
| ^
error[E0392]: parameter `T` is never used
--> $DIR/issue-37534.rs:1:12
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LL | struct Foo<T: ?Hash> { }
| ^ unused parameter
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= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
error: aborting due to 2 previous errors; 1 warning emitted
Some errors have detailed explanations: E0392, E0404.
For more information about an error, try `rustc --explain E0392`.
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