contract Test {
    fn set(u32[3][]  _data, u256 a, u256 b)

    -> (u256 l, u256 e)
    {
        l = _data.length;
        e = _data[a][b];
    }
}
// ====
// compileViaYul: also
// ----
// set(u32[3][],u256,u256): 0x60, 0x03, 0x02, 0x06, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12  -> 0x06, 0x0c