patch 8.0.0517: there is no way to remove quickfix lists commit https://github.com/vim/vim/commit/b6fa30ccc39cdb7f1d07b99fe2f4c6b61671dac2 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Mar 29 14:19:25 2017 +0200 patch 8.0.0517: there is no way to remove quickfix lists Problem: There is no way to remove quickfix lists (for testing). Solution: Add the 'f' action to setqflist(). Add tests. (Yegappan Lakshmanan)

--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -10038,7 +10038,8 @@ set_qf_ll_list(
 	    act = get_tv_string_chk(action_arg);
 	    if (act == NULL)
 		return;		/* type error; errmsg already given */
-	    if ((*act == 'a' || *act == 'r' || *act == ' ') && act[1] == NUL)
+	    if ((*act == 'a' || *act == 'r' || *act == ' ' || *act == 'f') &&
+		    act[1] == NUL)
 		action = *act;
 	    else
 		EMSG2(_(e_invact), act);