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Re^6: POD for use feature 'declared_refs' wrong

by swl (Vicar)
on Oct 19, 2021 at 21:55 UTC ( #11137753=note: print w/replies, xml ) Need Help??


in reply to Re^5: POD for use feature 'declared_refs' wrong
in thread POD for use feature 'declared_refs' wrong

Use of the apostrophe as the package separator might soon be a thing of the past also.

https://www.nntp.perl.org/group/perl.perl5.porters/2021/08/msg261286.html

  • Comment on Re^6: POD for use feature 'declared_refs' wrong

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Re^7: POD for use feature 'declared_refs' wrong
by kcott (Archbishop) on Oct 20, 2021 at 02:50 UTC

    To be honest, I was surprised to find that it was still valid in v5.34 — thanks for the info.

    I had written, "I haven't used [it] in over 20 years"; upon reflection, I believe my last usage was probably in 1996 or 1997; so that's closer to a quarter of a century.

    The message, to which you linked, had "... $user's problem ...", followed by "This bites experts and new users alike ...". I suspect I could have been one of those bitten, if reviewing another's code without "use warnings;". In v5.28, a new warning was added: see "perl5280delta: New Warnings" and "perldiag: Old package separator used in string". My normal code would be something along these lines:

    ken@titan ~/tmp $ cat pm_11137628_pkg_sep_in_string.pl use strict; use warnings; my $user = 'ken'; print "... $user's problem ...\n";

    which, when run, gives me ample feedback:

    ken@titan ~/tmp $ perl -v This is perl 5, version 34, subversion 0 (v5.34.0) built for cygwin-th +read-multi ... ken@titan ~/tmp $ perl pm_11137628_pkg_sep_in_string.pl Old package separator used in string at pm_11137628_pkg_sep_in_string. +pl line 6. (Did you mean "$user\'s" instead?) Name "user::s" used only once: possible typo at pm_11137628_pkg_sep_in +_string.pl line 6. Use of uninitialized value $user::s in concatenation (.) or string at +pm_11137628_pkg_sep_in_string.pl line 6. ... problem ...

    I don't have anything earlier than v5.30 on that system:

    $ perlbrew list * perl-5.34.0 perl-5.33.5 perl-5.32.0 perl-5.30.0

    However, on another OS:

    C:\Users\ken\tmp>perl -v This is perl 5, version 26, subversion 3 (v5.26.3) built for MSWin32-x +64-multi-thread ... C:\Users\ken\tmp>perl pm_11137628_pkg_sep_in_string.pl Name "user::s" used only once: possible typo at pm_11137628_pkg_sep_in +_string.pl line 6. Use of uninitialized value $user::s in concatenation (.) or string at +pm_11137628_pkg_sep_in_string.pl line 6. ... problem ...

    Not quite as "ample" feedback. I expect I could work it out from here; others might be saying frustratedly: 'But there is no "user::s" in my code'.

    I read through about the first dozen NNTP messages. Most discussion seemed to be about whether removal should be partial or complete, and backward-compatibility. When I got to https://www.nntp.perl.org/group/perl.perl5.porters/2021/08/msg261321.html and read "... disks of infinite size coming free with a packet of corn flakes ...", I had a chuckle and left it there. I wouldn't personally have any problem if the old style package separator was removed permanently and completely.

    — Ken

Re^7: POD for use feature 'declared_refs' wrong
by eyepopslikeamosquito (Bishop) on Oct 20, 2021 at 04:26 UTC

    Didn::t know that. Thanks for letting us know.

    Though it puts a crimp on Perl joke modules, there don::t appear to be enough of those to warrant keeping it -- the only one I remembered without googling was Chris Nandor's classic Do'h, released before the CPAN Acme namespace was born.

    This is all I could find:

    • Do'h by Chris Nandor
    • D'oh::Year by Mick Schwern
    • Acme::Don't by Damian Conway
    • Test::More - this core module uses a typeglob alias (sub isnt { ... } *isn't = \&isnt) to allow you to write isn't in your tests instead of isnt ... hardly a critical feature. :)

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