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error[E0405]: cannot find trait `Hash` in this scope
--> $DIR/issue-37534.rs:1:16
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LL | struct Foo<T: ?Hash> { }
| ^^^^ not found in this scope
help: possible candidate is found in another module, you can import it into scope
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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 type parameter
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= help: consider removing `T` or using a marker such as `std::marker::PhantomData`
error: aborting due to 2 previous errors
Some errors occurred: E0392, E0405.
For more information about an error, try `rustc --explain E0392`.
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