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+error[E0277]: the trait bound `T: Foo` is not satisfied
+ --> $DIR/wf.rs:5:14
+ |
+LL | trait B<T> = A<T>;
+ | ^^^^ the trait `Foo` is not implemented for `T`
+ |
+note: required by a bound in `A`
+ --> $DIR/wf.rs:4:12
+ |
+LL | trait A<T: Foo> {}
+ | ^^^ required by this bound in `A`
+help: consider restricting type parameter `T`
+ |
+LL | trait B<T: Foo> = A<T>;
+ | +++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.