#![allow(dead_code)]

trait MultiDispatch<T> {
    type O;
}

trait Trait: Sized {
    type A: MultiDispatch<Self::B, O = Self>;
    type B;

    fn new<U>(u: U) -> <Self::A as MultiDispatch<U>>::O where Self::A : MultiDispatch<U>;
}

fn test<T: Trait<B=i32>>(b: i32) -> T where T::A: MultiDispatch<i32> { T::new(b) }
//~^ ERROR type mismatch resolving

fn main() {}