src/test/ui/traits/traits-multidispatch-bad.rs

// Test that we detect an illegal combination of types.

trait Convert<Target> {
    fn convert(&self) -> Target;
}

impl Convert<u32> for i32 {
    fn convert(&self) -> u32 {
        *self as u32
    }
}

fn test<T,U>(_: T, _: U)
where T : Convert<U>
{
}

fn a() {
    test(22i32, 44i32); //~ ERROR mismatched types
}

fn main() {}