in reply to Re: diagnostics: warning, deprecation, error
in thread diagnostics: warning, deprecation, error

no longer supported

perl -MConfig=compile_date -le'$|++;for(`perldoc -u perldiag`){print${
+1}and$-++if/^=item\s+(\S\S.*)$/}print(($-+1)," diagnostic warnings, d
+eprecations, errors in perl $^V ").compile_date()' | grep -i 'no long
+er supported'

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\C no longer supported in regex; marked by S<<-- HERE> in m/%s/
${^ENCODING} is no longer supported
$* is no longer supported as of Perl 5.30
$# is no longer supported as of Perl 5.30

did you mean

perl -MConfig=compile_date -le'$|++;for(`perldoc -u perldiag`){print${
+1}and$-++if/^=item\s+(\S\S.*)$/}print(($-+1)," diagnostic warnings, d
+eprecations, errors in perl $^V ").compile_date()' | grep -i 'did you
+ mean'

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(Did you mean &%s instead?)
(Did you mean "local" instead of "our"?)
(Did you mean $ or @ instead of %?)
do "%s" failed, '.' is no longer in @INC; did you mean do "./%s"?
length() used on %s (did you mean "scalar(%s)"?)
Perl %s required (did you mean %s?)--this is only %s, stopped
$[ used in %s (did you mean $] ?)

crash

perl -MConfig=compile_date -le'$|++;for(`perldoc -u perldiag`){print${
+1}and$-++if/^=item\s+(\S\S.*)$/}print(($-+1)," diagnostic warnings, d
+eprecations, errors in perl $^V ").compile_date()' | grep -i crash

[download]
Locale '%s' is unsupported, and may crash the interpreter

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Re^3: diagnostics: warning, deprecation, error
by ikegami (Patriarch) on Feb 10, 2026 at 17:48 UTC

    Do you have a point or a question?

[reply]
      Usual perl error: 
      perl -MSuper::Duper -e 'print Super::Duper->new->thing'

      [download]
      Can't locate Super/Duper.pm in @INC (you may need to install the Super::Duper module) (@INC entries checked: /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/site_perl/5.42.0/darwin-2level /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/site_perl/5.42.0 /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/5.42.0/darwin-2level /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/5.42.0).
BEGIN failed--compilation aborted.
      Improved perl error: 
      perl -MIPC::Cmd=run -le '@_=run(command=>"perl -MSuper::Duper");$_=joi
+n"",@{$_[2]};s/ ([\(])/\n/g;s/ ([\/])/\n $1/g;s/\)//g;chomp;print'

      [download]
      Can't locate Super/Duper.pm in @INC
you may need to install the Super::Duper module
@INC entries checked:
 /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/site_perl/5.42.0/darwin-2level
 /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/site_perl/5.42.0
 /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/5.42.0/darwin-2level
 /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/5.42.0.
BEGIN failed--compilation aborted.
      Ideal perl error? (formatted nice like perl -v): 
      Can't locate Super/Duper.pm in @INC
See: perldoc -v @INC

You may need to install the Super::Duper module!
https://metacpan.org/search?q=Super::Duper

@INC entries checked:
 /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/site_perl/5.42.0/darwin-2level
 /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/site_perl/5.42.0
 /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/5.42.0/darwin-2level
 /Users/u/perl5/perlbrew/perls/perl-5.42.0/lib/5.42.0.

BEGIN failed--compilation aborted.
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        This is much nicer, and I guess I've always just accepted the way it is now for historic reasons, it looked liked this since I first experienced it, and I knew what it meant and what to do. I'm putting together a patch that makes it look like your suggestion:

        ./perl -MDerp::Derp
Can't locate Derp/Derp.pm in @INC

See: perldoc -v @INC

You may need to install the Derp::Derp module:
https://metacpan.org/search?q=Derp::Derp

@INC entries checked:

  /home/marto/localperl/lib/site_perl/5.42.0/x86_64-linux
  /home/marto/localperl/lib/site_perl/5.42.0
  /home/marto/localperl/lib/5.42.0/x86_64-linux
  /home/marto/localperl/lib/5.42.0.
BEGIN failed--compilation aborted.

~/localperl/bin

        [download]

        But need to fix the breaking tests that go looking for the old format in:

        Failed 5 tests out of 2667, 99.81% okay.
../cpan/Test-Simple/t/Legacy/fail-more.t
../cpan/parent/t/parent.t
op/inccode-tie.t
op/inccode.t
op/require_errors.t

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