src/test/ui/traits/trait-bounds-not-on-bare-trait.rs

trait Foo {
    fn dummy(&self) { }
}

// This should emit the less confusing error, not the more confusing one.

fn foo(_x: Foo + Send) {
    //~^ ERROR the size for values of type
    //~| WARN trait objects without an explicit `dyn` are deprecated
}

fn main() { }