@@ -86,9 +86,9 @@
 	alias Tuple!(T,int) t;
 
 	t[] cur, next;
 
-	void push(T v, int p) { (cur.empty ? cur : next) ~= tuple(v,p); }
+	void push(T v, int p) { if(cur.empty) cur ~= tuple(v,p); else next ~= tuple(v,p); }
 	bool empty() { return cur.empty; }
 	t pop() {
 		t v = cur[0]; cur = cur[1..$];
 		if(cur.empty) { cur = next; next = null; }