anchor.diff:  
   const String TEST_FIVE_WITH_BAILOUT = r"""
   foo(a) {
  +  print([]);
     for (int i = 0; i < 1; i++) {
       a[0] = 1;
       print(a[1]);
  
positive.code: 
  const String TEST_SIX = r"""
  foo(a) {
    print(a[0]);
    while (true) {
      a[0] = a[1];
  
negative.code: 
  const String TEST_THREE = r"""
  foo(a) {
    print([]);
    for (int b = 0; b < 10; b++) print(a[b]);
  }
  """;
  