hyperledger-solang_solang/docs/examples/function_call_external.sol

contract foo {
    function bar1(uint32 x, bool y) public returns (address, bytes32) {
        return (address(3), hex"01020304");
    }

    function bar2(uint32 x, bool y) public returns (bool) {
        return !y;
    }
}

contract bar {
    function test(foo f) public {
        (address f1, bytes32 f2) = f.bar1(102, false);
        bool f3 = f.bar2({x: 255, y: true});
    }
}