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error[E0277]: the trait bound `U: Copy` is not satisfied
--> $DIR/wf-trait-bound.rs:10:14
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LL | where T: ExtraCopy<U>
| ^^^^^^^^^^^^ the trait `Copy` is not implemented for `U`
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note: required by a bound in `ExtraCopy`
--> $DIR/wf-trait-bound.rs:7:19
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LL | trait ExtraCopy<T:Copy> { }
| ^^^^ required by this bound in `ExtraCopy`
help: consider further restricting type parameter `U`
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LL | where T: ExtraCopy<U>, U: std::marker::Copy
| ++++++++++++++++++++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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