Add in perldelta changes about unpack A and trailing whitespace, trie

[p5sagit/p5-mst-13.2.git] / pod / perltodo.pod

diff --git a/pod/perltodo.pod b/pod/perltodo.pod
index e44f242..ca6b345 100644 (file)
--- a/pod/perltodo.pod
+++ b/pod/perltodo.pod
@@ -117,11 +117,6 @@ Currently the %ENV entries are always byte strings.
 The regexp optimiser is not optional. It should configurable to be, to allow
 its performance to be measured, and its bugs to be easily demonstrated.
 
-=head2 common suffices/prefices in regexps (trie optimization)
-
-Currently, the user has to optimize C<foo|far> and C<foo|goo> into
-C<f(?:oo|ar)> and C<[fg]oo> by hand; this could be done automatically.
-
 =head1 POD
 
 =head2 POD -> HTML conversion still sucks
@@ -184,6 +179,13 @@ Clean these up. Move them to mathom.c, and don't compile for blead?
 The old perltodo notes "This has been done in places, but needs a thorough
 code review. Also fchdir is available in some platforms."
 
+=head2 Constant folding
+
+The peephole optimiser should trap errors during constant folding, and give
+up on the folding, rather than bailing out at compile time.  It is quite
+possible that the unfoldable constant is in unreachable code, eg something
+akin to C<$a = 0/0 if 0;>
+
 =head1 Tests
 
 =head2 Make Schwern poorer