$ ./perl -Ilib Porting/corelist.pl cpan
This will chug for a while, possibly reporting various warnings about
-badly-indexed CPABN modules unreltaed to the modules actually in core.
+badly-indexed CPAN modules unrelated to the modules actually in core.
Assuming all goes well, it will update
F<dist/Module-CoreList/lib/Module/CoreList.pm>.