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error[E0210]: type parameter `Foo` must be used as the type parameter for some local type (e.g., `MyStruct<Foo>`)
--> $DIR/issue-28981.rs:5:6
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LL | impl<Foo> Deref for Foo { }
| ^^^ type parameter `Foo` must be used as the type parameter for some local type
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= note: implementing a foreign trait is only possible if at least one of the types for which it is implemented is local
= note: only traits defined in the current crate can be implemented for a type parameter
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0210`.
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