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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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error: bound modifier `?` can only be applied to `Sized`
--> $DIR/issue-37534.rs:1:15
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LL | struct Foo<T: ?Hash> {}
| ^^^^^
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0404`.
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