Assertion failure: '!vthis->csym' on line 713 in file 'glue.c

[azurenote]

Hi there, please look at this. This code occur "Assertion failure:
'!vthis->csym' on line 713 in file 'glue.c":

 

import std.algorithm;

 

class Node

{

         Node _parent;

         Node[] _children;

         

         this()

         {

         }

         

         void addChild(Node child)

         {

                  _children ~= child;

         }

         

         void removeChild(Node child)

         {

                  _children = remove!( (i){return i == child;} )(_children);
// This line crashes!

         }

         

@property:

         Node parent() {return _parent;}

 

         void parent(Node node) {_parent = node;}

 

         Node[] children() {return _children;}

}

 

I cannot understand error message..

 

What is the problem? Or how can I fix it?

 

ps> There are not enough examples for std.container :(