$ ./perl -Ilib Porting/core-cpan-diff -a -o /tmp/corediffs
-Passing C<-u cpan> (and maybe C<-u undef>) will probably be helpful, since
-it limits the search to distributions with those upstream sources. (It's
-OK for blead upstream to differ from CPAN because those dual-life releases
-usually come I<after> perl is released.
+Passing C<-u cpan> will probably be helpful, since it limits the search to
+distributions with 'cpan' upstream source. (It's OK for blead upstream to
+differ from CPAN because those dual-life releases usually come I<after> perl
+is released.)
See also the C<-d> and C<-v> options for more detail (and the C<-u> option as
mentioned above). You'll probably want to use the C<-c cachedir> option to
of blead, then consider updating it (or asking the relevant porter to do so).
If blead contains edits to a 'cpan' upstream module, this is naughty but
sometimes unavoidable to keep blead tests passing. Make sure the affected file
-has a CUSTOMIZED entry in F<Porting/Maintainers.pl>. For 'undef' upstream,
-you'll have to use your judgment for whether any delta should be ignored (like
-'blead' upstream) or treated like a 'cpan' upstream and flagged. Ask around on
-#p5p if you're not sure.
+has a CUSTOMIZED entry in F<Porting/Maintainers.pl>.
If you are making a MAINT release, run C<core-cpan-diff> on both blead and
maint, then diff the two outputs. Compare this with what you expect, and if