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All the Perl that's Practical to Extract and Report

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  • 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)