contract test {
    function f(uint8 a) public returns (uint) { return a; }
    function f(uint a) public returns (uint) { return 2 * a; }
    // literal 1 can be both converted to uint and uint8, so the call is ambiguous.
    function g() public returns (uint) { return f(1); }
}
// ----
// TypeError: (271-272): No unique declaration found after argument-dependent lookup.