[PATCH 2/8] nntp: consistently use 501 for unsupported LIST

[Eric Wong <e@80x24.org>]

This is required by RFC 3977, section 3.2.1
---
 lib/PublicInbox/NNTP.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index c2f9717..dd033e8 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -123,14 +123,14 @@ sub list_newsgroups ($;$) {
 	}
 }
 
-# LIST SUBSCRIPTIONS not supported
+# LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
 sub cmd_list ($;$$) {
 	my ($self, @args) = @_;
 	if (scalar @args) {
 		my $arg = shift @args;
 		$arg =~ tr/A-Z./a-z_/;
 		$arg = "list_$arg";
-		return '503 function not performed' if $DISABLED{$arg};
+		return r501 if $DISABLED{$arg};
 
 		$arg = eval {
 			no strict 'refs';
-- 
EW