library Lib {
    function set(mapping(uint => uint) storage m, uint key, uint value) public
    {
        m[key] = value;
    }
}
contract Test {
    mapping(uint => uint) m1;
    mapping(uint => uint) m2;
    function f() public returns (uint, uint, uint, uint, uint, uint)
    {
        Lib.set(m1, 0, 1);
        Lib.set(m1, 2, 42);
        Lib.set(m2, 0, 23);
        Lib.set(m2, 2, 99);
        return (m1[0], m1[1], m1[2], m2[0], m2[1], m2[2]);
    }
}
// ====
// compileToEwasm: false
// ----
// library: Lib
// f() -> 1, 0, 0x2a, 0x17, 0, 0x63
// gas irOptimized: 119659
// gas legacy: 124793
// gas legacyOptimized: 119694