diff --git a/filter/config.Y b/filter/config.Y
index 45444eb2..353e27ae 100644
--- a/filter/config.Y
+++ b/filter/config.Y
@@ -946,22 +946,10 @@ term:
  | '-' '-' EMPTY '-' '-' { $$ = f_new_inst(FI_CONSTANT, f_get_empty(T_ECLIST)); }
  | '-' '-' '-' EMPTY '-' '-' '-' { $$ = f_new_inst(FI_CONSTANT, f_get_empty(T_LCLIST)); }
 
- | PREPEND '(' term ',' term ')' {
-     $$ = f_dispatch_method_x("prepend", $3->type, $3, $5);
-     cf_warn("prepend(x,y) function is deprecated, please use x.prepend(y)");
-   }
- | ADD '(' term ',' term ')' {
-     $$ = f_dispatch_method_x("add", $3->type, $3, $5);
-     cf_warn("add(x,y) function is deprecated, please use x.add(y)");
-   }
- | DELETE '(' term ',' term ')' {
-     $$ = f_dispatch_method_x("delete", $3->type, $3, $5);
-     cf_warn("delete(x,y) function is deprecated, please use x.delete(y)");
-   }
- | FILTER '(' term ',' term ')' {
-     $$ = f_dispatch_method_x("filter", $3->type, $3, $5);
-     cf_warn("filter(x,y) function is deprecated, please use x.filter(y)");
-   }
+ | PREPEND '(' term ',' term ')' { $$ = f_dispatch_method_x("prepend", $3->type, $3, $5); }
+ | ADD '(' term ',' term ')' { $$ = f_dispatch_method_x("add", $3->type, $3, $5); }
+ | DELETE '(' term ',' term ')' { $$ = f_dispatch_method_x("delete", $3->type, $3, $5); }
+ | FILTER '(' term ',' term ')' { $$ = f_dispatch_method_x("filter", $3->type, $3, $5); }
 
  | ROA_CHECK '(' rtable ')' { $$ = f_implicit_roa_check($3); }
  | ROA_CHECK '(' rtable ',' term ',' term ')' { $$ = f_new_inst(FI_ROA_CHECK, $5, $7, $3); }
diff --git a/filter/f-inst.c b/filter/f-inst.c
index dab6cdfb..2a6ef6cf 100644
--- a/filter/f-inst.c
+++ b/filter/f-inst.c
@@ -874,6 +874,11 @@
 	  case T_IP:
 	    RESULT_(T_IP, ip, *((const ip_addr *) e->u.ptr->data));
 	    break;
+
+	  case T_STRING:
+	    RESULT_(T_STRING, s, (const char *) e->u.ptr->data);
+	    break;
+
 	  default:
 	    RESULT_VAL([[(struct f_val) {
 		.type = e->type,
@@ -916,6 +921,11 @@
 	    EA_LITERAL_STORE_ADATA(da, 0, &v1.val.ip, sizeof(ip_addr)));
 	break;
 
+      case T_STRING:
+	a = ea_set_attr(&fs->rte->attrs,
+	    EA_LITERAL_STORE_ADATA(da, 0, &v1.val.s, strlen(v1.val.s) + 1));
+	break;
+
       default:
 	a = ea_set_attr(&fs->rte->attrs,
 	    EA_LITERAL_GENERIC(da->id, da->type, 0, .u = v1.val.bval));
diff --git a/nest/rt-attr.c b/nest/rt-attr.c
index e29ded29..468b279d 100644
--- a/nest/rt-attr.c
+++ b/nest/rt-attr.c
@@ -1446,6 +1446,9 @@ ea_show(struct cli *c, const eattr *e)
 	case T_LCLIST:
 	  ea_show_lc_set(c, cls->name, ad, buf);
 	  return;
+	case T_STRING:
+	  bsnprintf(pos, end - pos, "%s", (const char *) ad->data);
+	  break;
 	case T_NEXTHOP_LIST:
 	  ea_show_nexthop_list(c, (struct nexthop_adata *) e->u.ptr);
 	  return;