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error[E0119]: conflicting implementations of trait `Foo` for type `()`
--> $DIR/incoherent-even-though-we-fulfill.rs:15:1
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LL | impl<T> Foo for T where (): Mirror<Assoc = T> {}
| --------------------------------------------- first implementation here
LL |
LL | impl<T> Foo for T where T: Iterator {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `()`
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= note: upstream crates may add a new impl of trait `std::iter::Iterator` for type `()` in future versions
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0119`.
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