src/test/ui/span/issue-35987.rs

struct Foo<T: Clone>(T);

use std::ops::Add;

impl<T: Clone, Add> Add for Foo<T> {
//~^ ERROR expected trait, found type parameter
    type Output = usize;

    fn add(self, rhs: Self) -> Self::Output {
        unimplemented!();
    }
}

fn main() {}