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+error[E0277]: the trait bound `U: Copy` is not satisfied
+ --> $DIR/wf-enum-bound.rs:10:14
+ |
+LL | where T: ExtraCopy<U>
+ | ^^^^^^^^^^^^ the trait `Copy` is not implemented for `U`
+ |
+note: required by a bound in `ExtraCopy`
+ --> $DIR/wf-enum-bound.rs:7:19
+ |
+LL | trait ExtraCopy<T:Copy> { }
+ | ^^^^ required by this bound in `ExtraCopy`
+help: consider further restricting type parameter `U`
+ |
+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`.