diff --git a/src/evalfunc.c b/src/evalfunc.c
index d644a3e..8970ac7 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -45,6 +45,7 @@
 static void f_echoraw(typval_T *argvars, typval_T *rettv);
 static void f_empty(typval_T *argvars, typval_T *rettv);
 static void f_environ(typval_T *argvars, typval_T *rettv);
+static void f_err_teapot(typval_T *argvars, typval_T *rettv);
 static void f_escape(typval_T *argvars, typval_T *rettv);
 static void f_eval(typval_T *argvars, typval_T *rettv);
 static void f_eventhandler(typval_T *argvars, typval_T *rettv);
@@ -1881,6 +1882,8 @@
 			ret_number_bool,    f_empty},
     {"environ",		0, 0, 0,	    NULL,
 			ret_dict_string,    f_environ},
+    {"err_teapot",	0, 1, 0,	    NULL,
+			ret_number_bool,    f_err_teapot},
     {"escape",		2, 2, FEARG_1,	    arg2_string,
 			ret_string,	    f_escape},
     {"eval",		1, 1, FEARG_1,	    arg1_string,
@@ -3923,6 +3926,33 @@
 }
 
 /*
+ * "err_teapot()" function
+ */
+    static void
+f_err_teapot(typval_T *argvars, typval_T *rettv UNUSED)
+{
+    if (argvars[0].v_type != VAR_UNKNOWN)
+    {
+	if (argvars[0].v_type == VAR_STRING)
+	{
+	    char_u *s = tv_get_string_strict(&argvars[0]);
+	    if (s == NULL || *skipwhite(s) == NUL)
+		return;
+	}
+
+	int err = FALSE;
+	int do_503 = eval_expr_to_bool(&argvars[0], &err);
+	if (!err && do_503)
+	{
+	    emsg(_(e_coffee_currently_not_available));
+	    return;
+	}
+    }
+
+    emsg(_(e_im_a_teapot));
+}
+
+/*
  * "escape({string}, {chars})" function
  */
     static void
@@ -6458,6 +6488,14 @@
 		0
 #endif
 		},
+	{":tearoff",
+// same #ifdef as used for ex_tearoff().
+#if defined(FEAT_GUI_MSWIN) && defined(FEAT_MENU) && defined(FEAT_TEAROFF)
+		1
+#else
+		0
+#endif
+		},
 	{NULL, 0}
     };