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error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
--> $DIR/coherence.rs:17:1
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LL | impl foreign_crate::ForeignTrait for AliasOfForeignType<()> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^----------------------
| |
| type alias impl trait is treated as if it were foreign, because its hidden type could be from a foreign crate
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= note: impl doesn't have any local type before any uncovered type parameters
= note: for more information see https://doc.rust-lang.org/reference/items/implementations.html#orphan-rules
= note: define and implement a trait or new type instead
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0117`.
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