Don't need to pop in reject

src/test.cpp

@@ -517,10 +517,7 @@ private:
     MUSTTAIL return table[top][token](self);
   }
 
-  static bool reject(Parser2 *self) {
-    self->pop();
-    return false;
-  }
+  static bool reject(Parser2 *) { return false; }
   static bool object(Parser2 *self) {
     self->pop();
     self->callbacks->on_begin_object(self->data);