anchor.diff:  $package$identityHash($dart$core.Object identifiable)
     => identityHash(identifiable);
   
  -// printStackTrace
  +/////////////////////////////////////////////////
  +//
  +// ceylon.language::printStackTrace
  +//
  +/////////////////////////////////////////////////
   
   void printStackTrace([Throwable exception, $dart$core.Object write = dart$default]) {
     // TODO if the stackTrace is not available, should we just print <null> or something instead?
  
positive.code:   }
  }
  
  //
  // Boolean.dart
  //
  
  class Boolean implements dart$$Basic {
    final $dart$core.bool _value;
  
negative.code:   return integer.toSigned(32) ^ mask;
  }
  
  /////////////////////////////////////////////////
  //
  // ceylon.language::String
  //
  /////////////////////////////////////////////////
  
  class String extends impl$BaseCharacterList implements Summable, Comparable {
    final $dart$core.String _value;
  