Compile error!

[sdv via Digitalmars-d]

import std.stdio;
import core.memory;

struct sQueue(T)
{
	struct sNode
	{
		T	mfPayload = T.init;
		union{
			typeof(this)*	mfPrev;
			shared(typeof(this)*)	mfShPrev;
		}
		union{
			typeof(this)*	mfNext;
			shared(typeof(this)*)	mfShNext;
		}
	}


	//shared(sQueueNode)	mfRoot;
	sNode	mfRoot;

	void pfPut(T v,sNode* r = null)
	{
		if(r is null) r = &this.mfRoot;
		shared auto n = new sNode(v);

	}

}


int main(string[] argv)
{
	auto b1 = new sQueue!uint;



     writeln("Hello D-World!");
	writeln("Hello D-World!");
	writeln("Hello D-World!");
     return 0;
}