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This error indicates that there is a mismatch between generic parameters and
impl Trait parameters in a trait declaration versus its impl.
```compile_fail,E0643
trait Foo {
fn foo(&self, _: &impl Iterator);
}
impl Foo for () {
fn foo<U: Iterator>(&self, _: &U) { } // error method `foo` has incompatible
// signature for trait
}
```
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