class TestCase::Matrix4_16d : mulnum_t {
  has x11 : double;
  has x21 : double;
  has x31 : double;
  has x41 : double;
  has x12 : double;
  has x22 : double;
  has x32 : double;
  has x42 : double;
  has x13 : double;
  has x23 : double;
  has x33 : double;
  has x43 : double;
  has x14 : double;
  has x24 : double;
  has x34 : double;
  has x44 : double;
}