pkg-perl-maintainers team mailing list archive

[gregor herrmann <2007279@xxxxxxxxxxxxxxxxxx>]

On Wed, 01 Mar 2023 09:04:15 -0000, Christian Ehrhardt  wrote:

> This looks wrong to be added to main in 2023. I mean this package clearly
> states "This is an obsolete module provided for compatibility since it is being
> removed from the core. For perl 5.10 and above the "given/when" builtins
> are much preferred."
> Perl 5.10 was in Ubuntu since intrepid, that is 13 years ago.
> New code should just use [1]
…
> [1]: https://www.geeksforgeeks.org/perl-given-when-statement/

Quick additional info:

I agree that using the old Switch module has a bad smell; but what
the old documentation of the old Switch module doesn't know is that
reccommending given/when is also problematic, as this (and more
importantly the underlying smartmatch feature) are deprecated and
will be removed from perl.

Timeline:
- After years of discussions, the deprecation has landed in git
  recently:
  https://github.com/Perl/perl5/commit/ac8ba642ae7dadc7f3491e13148b8d1c45b84649
  and the commits around it
- This most probably will show up as new warnings in 5.37.10 (March
  2023, dev release) and 5.38.0 (May 2023, next release).
- Removal is currently planned for 5.42.0 (May 2025).  

So starting to use given/when now is not really future-proof …


Currently there's no good way to write switch/case statements in Perl
(although there's hope that something will appear in perl core in the
future, maybe built on the experimental
https://metacpan.org/pod/Syntax::Keyword::Match ) … The safest way is
probably to go back to if/elsif/else …


Some more links:
https://blogs.perl.org/mt/mt-search.cgi?limit=20&search=smartmatch
https://www.nntp.perl.org/group/perl.perl5.porters/2022/12/msg265180.html
https://leonerds-code.blogspot.com/2022/06/a-troubling-thought-smartmatch.html


Cheers,
gregor, Debian Perl Group

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https://bugs.launchpad.net/bugs/2007279

Title:
  [MIR] libdigest-md5-file-perl & libswitch-perl (dependency of
  devscripts)

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