anchor.diff:          }
       }
   }
  -class loop$$anonymous$0_$$anonymous$1_ implements Iterator {
  +class loop$$anonymous$0_$$anonymous$1_ implements dart$$Basic, Iterator {
       loop$$anonymous$0_ $outer$ceylon$language$loop$$anonymous$0_;
       loop$$anonymous$0_$$anonymous$1_([loop$$anonymous$0_ $outer$ceylon$language$loop$$anonymous$0_]) {
           this.$outer$ceylon$language$loop$$anonymous$0_ = $outer$ceylon$language$loop$$anonymous$0_;
  
positive.code:     $dart$core.bool definesAny([Iterable keys]) => Correspondence.$definesAny(this, keys);
      Iterable getAll([Iterable keys]) => Correspondence.$getAll(this, keys);
  }
  class Map$filterKeys$$anonymous$5_ implements Map {
      Map $outer$ceylon$language$Map;
      Callable $capture$Map$filterKeys$filtering;
      Map$filterKeys$$anonymous$5_([Map $outer$ceylon$language$Map, Callable $capture$Map$filterKeys$filtering]) {
  
negative.code:     $dart$core.bool definesAny([Iterable keys]) => Correspondence.$definesAny(this, keys);
      Iterable getAll([Iterable keys]) => Correspondence.$getAll(this, keys);
  }
  class List$Patch$$anonymous$6_ implements dart$$Basic, Iterator {
      List$Patch $outer$ceylon$language$List$Patch;
      Iterator $capture$$iter;
      Iterator $capture$$patchIter;
  