anchor.diff:    Configuration visitVariableSet(VariableSet node, EvalConfiguration config) {
       var cont = new VariableSetEK(
           node.variable, config.environment, config.continuation);
  -    return new EvalConfiguration(node.value, config.environment, cont);
  +    return new EvalConfiguration(
  +        node.value, config.environment, config.exceptionComponents, cont);
     }
   
     Configuration visitPropertyGet(PropertyGet node, EvalConfiguration config) {
       var cont = new PropertyGetEK(node.name, config.continuation);
  -    return new EvalConfiguration(node.receiver, config.environment, cont);
  +    return new EvalConfiguration(
  +        node.receiver, config.environment, config.exceptionComponents, cont);
     }
   
     Configuration visitPropertySet(PropertySet node, EvalConfiguration config) {
  -    var cont = new PropertySetEK(
  -        node.value, node.name, config.environment, config.continuation);
  -    return new EvalConfiguration(node.receiver, config.environment, cont);
  +    var cont = new PropertySetEK(node.value, node.name, config.environment,
  +        config.exceptionComponents, config.continuation);
  +    return new EvalConfiguration(
  +        node.receiver, config.environment, config.exceptionComponents, cont);
     }
   
     Configuration visitStaticGet(StaticGet node, EvalConfiguration config) =>
  
positive.code:       statement.accept1(this, conf);
    Configuration eval(Expression expression, EvalConfiguration config) =>
        evaluator.eval(expression, config);
    Configuration evalList(
            List<InterpreterExpression> es, Environment env, Continuation cont) =>
        evaluator.evalList(es, env, cont);
  
    Configuration defaultStatement(Statement node, ExecConfiguration conf) {
      throw notImplemented(
  
negative.code:   final int initializerIndex;
    final Location location;
    final Environment environment;
    final ExceptionComponents exceptionComponents;
    final ConstructorBodySK continuation;
  
    final Class _currentClass;
  
    InitializerListEK(this.constructor, this.initializerIndex, this.location,
        this.environment, this.exceptionComponents, this.continuation)
        : _currentClass = new Class(constructor.enclosingClass.reference);
  
    /// Creates a continuation for the evaluation of the initializer at position
    /// [index].
    InitializerListEK withInitializerIndex(int index) {
      return new InitializerListEK(constructor, index, location, environment,
          exceptionComponents, continuation);
    }
  
    Configuration call(Value value) {
  