filter/base: export REJECT as a constant

And update callers to use it, as it makes the code a bit cleaner.
Probably irrelvant, but it should be faster, too, as
"perl -I lib -w -MO=Deparse $FILE" shows REJECT() calls are
constant-folded.

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/PublicInbox/Filter/Base.pm b/lib/PublicInbox/Filter/Base.pm
index 7a0c720f..81adab2a 100644
--- a/lib/PublicInbox/Filter/Base.pm
+++ b/lib/PublicInbox/Filter/Base.pm
@@ -6,6 +6,8 @@ package PublicInbox::Filter::Base;
 use strict;
 use warnings;
 use PublicInbox::MsgIter;
+use parent qw(Exporter);
+our @EXPORT_OK = qw(REJECT); # we may export IGNORE if/when needed
 
 sub No ($) { "*** We only accept plain-text mail, No $_[0] ***" }