os-rust/tests/ui/traits/multidispatch-conditional-impl-not-considered.rs

//@ run-pass
// Test that we correctly ignore the blanket impl
// because (in this case) `T` does not impl `Clone`.
//
// Issue #17594.

use std::cell::RefCell;

trait Foo { //~ WARN trait `Foo` is never used
    fn foo(&self) {}
}

impl<T> Foo for T where T: Clone {}

struct Bar;

impl Bar {
    fn foo(&self) {}
}

fn main() {
    let b = RefCell::new(Bar);
    b.borrow().foo();
}