assert self.getNumPop() == 1 : "Need code here to handle multiple pop";
	public Object visitPopExpression(SIRPopExpression oldSelf,					 CType oldTapeType) {	    SIRPopExpression self = (SIRPopExpression)super.visitPopExpression(oldSelf, oldTapeType);	    return FuseSplit.makeBufferPop(childInfo.peekBuffer);	}