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error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
--> $DIR/impl-with-unconstrained-param.rs:11:6
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LL | impl<T> X for () {
| ^ unconstrained type parameter
error[E0282]: type annotations needed
--> $DIR/impl-with-unconstrained-param.rs:14:23
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LL | fn f() -> Self::I {}
| ^^ cannot infer type for type parameter `T`
error[E0282]: type annotations needed
--> $DIR/impl-with-unconstrained-param.rs:14:15
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LL | fn f() -> Self::I {}
| ^^^^^^^ cannot infer type for type parameter `T`
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0207, E0282.
For more information about an error, try `rustc --explain E0207`.
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