use Perl

• Re: Help needed on a new 5.10 warning (Score:1)

  by kid51 (5328) on 2009.09.16 22:06 (#70607) Homepage Journal

  All I can offer is that during some recent attempts to refactor ExtUtils::ParseXS, I encountered this warning when attempting to make that module work under 'use strict'. IIRC, I got it in a part of the code that was using the "deferred regex evaluation" feature -- ??{ $some_variable } -- inside of itself.

  $bal = qr[(?:(?>[^()]+)|\((??{ $bal })\))*]; # ()-balanced

  $cast = qr[(?:\(\s*SV\s*\*\s*\)\s*)?]; # Optional (SV*) cast

  $size = qr[,\s* (??{ $bal }) ]x; # Third arg (to setpvn)

  Again, IIRC, my temporary workaround was to declare $bal as 'our' rather than 'my'. But since my work on this module has stalled, I can't offer any better insight. Note that 'perldoc perldiag' hints at this being a closure-related problem ... but I didn't encounter it in a closure-related situation at all.

  Thank you very much.

  kid51

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  • Re: (Score:1)

    by mpeters (5802)

    Thanks for the advice. I eventually tracked it down to Regexp::Common and was able to remove the warning if I just imported the number specific regexes:

      use Regexp::Common qw(number);