commit https://github.com/vim/vim/commit/d823fa910cca43fec3c31c030ee908a14c272640 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Aug 12 16:29:27 2016 +0200 patch 7.4.2200 Problem: Cannot get all information about a quickfix list. Solution: Add an optional argument to get/set loc/qf list(). (Yegappan Lakshmanan)

--- a/src/tag.c
+++ b/src/tag.c
@@ -916,7 +916,7 @@ do_tag(
 		}
 
 		vim_snprintf((char *)IObuff, IOSIZE, "ltag %s", tag);
-		set_errorlist(curwin, list, ' ', IObuff);
+		set_errorlist(curwin, list, ' ', IObuff, NULL);
 
 		list_free(list);
 		vim_free(fname);