anchor.diff:    }
   
     DartType unalias(Compiler compiler) => this;
  +
  +  accept(DartTypeVisitor visitor, var argument) {
  +    return visitor.visitVoidType(this, argument);
  +  }
   
     int get hashCode => 1729;
   
  
positive.code:   bool forEachMalformedType(bool f(MalformedType type)) => f(this);
  
    DartType unalias(Compiler compiler) => this;
  
    String toString() {
      var sb = new StringBuffer();
  
negative.code:   }
  
    TypedefType asRaw() => super.asRaw();
  
    accept(DartTypeVisitor visitor, var argument) {
      return visitor.visitTypedefType(this, argument);
    }
  }
  
  /**
  