found it

diff --git a/doc/plugins/trail/discussion.mdwn b/doc/plugins/trail/discussion.mdwn
index 93036e8784f58647a7e805032b105e5218d03b8c..6b458cef4297cf43149189877b6ed86989a8ecb1 100644 (file)
--- a/doc/plugins/trail/discussion.mdwn
+++ b/doc/plugins/trail/discussion.mdwn
@@ -176,4 +176,11 @@ I have removed a similar comment from the album discussion.
 >>>     perl -le 'use Storable; my $index = Storable::retrieve("stockholm/.ikiwiki/indexdb"); use Data::Dumper; print Dumper $index' |less
 >>>
 >>> indicates that `20130504` depends on `internal(*)` and so does `20130505`.
->>> I don't know why yet. --s
+>>>
+>>> After adding some `Carp::cluck` calls to the bits of IkiWiki.pm that add
+>>> dependencies, this turns out to be two similar issues, in `album` and
+>>> `trail`: they each use `pagespec_match_list` with the pagespec
+>>> `internal(*)` in order to apply a trivial filter (accept everything)
+>>> to an existing list for its side-effect of sorting that list. I'll
+>>> file a proper bug at some point; fixing it is going to need core
+>>> ikiwiki changes, I think. --s