The docs for eval suggest this idiom:

     # alter $@ on nefarious repugnancy only
     {
        my $e;
        {
          local $@; # protect existing $@
          eval { test_repugnancy() };
          # $@ =~ /nefarious/ and die $@; # Perl 5.14 and higher only
          $@ =~ /nefarious/ and $e = $@;
        }
        die $e if defined $e
     }

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In reply to Re^3: eval: Why use the 'Zombie error' idiom? by hippo
in thread eval: Why use the 'Zombie error' idiom? by DouglasDD

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