rust/src/test/compile-fail/ambig_impl_unify.rs

impl methods for [uint]/~ {
    fn foo() -> int {1} //! NOTE candidate #1 is `methods::foo`
}

impl methods for [int]/~ {
    fn foo() -> int {2} //! NOTE candidate #2 is `methods::foo`
}

fn main() {
    let x = []/~;
    x.foo(); //! ERROR multiple applicable methods in scope
}