File: issue-34503.rs

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//@ run-pass
fn main() {
    struct X;
    trait Foo<T> {
        fn foo(&self) where (T, Option<T>): Ord {} //~ WARN methods `foo` and `bar` are never used
        fn bar(&self, x: &Option<T>) -> bool
        where Option<T>: Ord { *x < *x }
    }
    impl Foo<X> for () {}
    let _ = &() as &dyn Foo<X>;
}