Can't incremen int inside funciton call -- bug?

[Aldarris]

Hello.

I have a nested function that iterates through a tree recursively.
here is it code:

void recursiveXMLTreeIteration(XMLNode currentNode, int treeLevel)
{
	writefln(treeLevel);
	tabOffset.length = 0;
	for(int i = 0; i < treeLevel; i++)
		{tabOffset ~= "\t";}
.......			
	foreach(XMLNode childNode; currentNode.getChildrenList())
		{recursiveXMLTreeIteration(childNode, treeLevel++);}
}

recursiveXMLTreeIteration(this, 0);

Does not work as expected, in a tree of a root node plus two child nodes it prints 0,0,1.

It treeLevel++; is moved outside, works as expected:
.......			
        treeLevel++;
	foreach(XMLNode childNode; currentNode.getChildrenList())
		{recursiveXMLTreeIteration(childNode, treeLevel)
}


Prints 0,1,1,