Programming Perl (3rd edition) claims on page xxvii:

...as of the 5.6.1 release of Perl, each main Perl manpage has its own search and display capability. You can search individual pages by using the name of the manpage as the command and passing a Perl regular expression ... as the search pattern.

% perlop comma
% perlfunc split
% perlvar ARGV
% perldiag 'assigned to typeglob'

This does not work (perlop, perlfunc, etc. do not exist) on the several installations of v5.6.1 that I have tried. Has anyone gotten this to work?

The book's errata page on O'Reilly's site has this listed under the link Unconfirmed error reports and comments from readers but has no further information on it.