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error[E0277]: the trait bound `(): Foo` is not satisfied
--> $DIR/trait-failure.rs:9:17
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LL | let x: impl Foo = W(());
| ^^^ the trait `Foo` is not implemented for `()`
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= help: the trait `Foo` is implemented for `W<T>`
note: required for `W<()>` to implement `Foo`
--> $DIR/trait-failure.rs:6:9
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LL | impl<T> Foo for W<T> where T: Foo {}
| ^^^ ^^^^ --- unsatisfied trait bound introduced here
error[E0277]: the trait bound `(): Foo` is not satisfied
--> $DIR/trait-failure.rs:11:19
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LL | let x: W<impl Foo> = W(());
| ^^^ the trait `Foo` is not implemented for `()`
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= help: the trait `Foo` is implemented for `W<T>`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0277`.
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