Fix bogus assert

src/parser.h

@@ -182,8 +182,7 @@ private:
   }
 
   static Status keepGoing(Parser2 *self) {
-    assert(!self->complete);
-    if (self->len() == 0) {
+    if (self->len() == 0 && !self->complete) {
       return S_AGAIN;
     }
     // self->debugPrint();