src/tools/rustfmt/tests/source/issue_4257.rs


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trait Trait<T> {
    type Type<'a> where T: 'a;
    fn foo(x: &T) -> Self::Type<'_>;
}
impl<T> Trait<T> for () {
    type Type<'a> where T: 'a = &'a T;
    fn foo(x: &T) -> Self::Type<'_> {
        x
    }
}