anchor.diff:    Expect.equals(false, 1 <= 0);
     Expect.equals(true, 0 <= 0);
   
  +  Expect.equals(true, confuse(1) <= 2);
  +  Expect.equals(false, confuse(2) <= 1);
  +  Expect.equals(true, confuse(1) <= 1);
  +
  +  Expect.equals(true, confuse(0) <= 1);
  +  Expect.equals(false, confuse(1) <= 0);
  +  Expect.equals(true, confuse(0) <= 0);
  +
     Expect.equals(true, one() <= 2);
     Expect.equals(false, 2 <= one());
     Expect.equals(true, 1 <= one());
  
positive.code:   Expect.equals(2, one() + one());
  }
  
  void subTest() {
    var m1 = 0 - 1;
    Expect.equals(0, 0 - 0);
  
negative.code:   Expect.equals(true, m1 <= 0);
    Expect.equals(false, 0 <= m1);
    Expect.equals(true, m1 <= m1);
  
    Expect.equals(true, minus1() <= 0);
    Expect.equals(false, 0 <= minus1());
    Expect.equals(true, minus1() <= minus1());
  }
  
  @NoInline()
  void greaterTest() {
    var m1 = minus1();
    Expect.equals(false, 1 > 2);
  