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          '__ANON__ called at Math/Pari.pm line 1148',
          '(eval) called at Math/Pari.pm line 1148',
...
          'login called at Net/SFTP.pm line 62',
          'init called at Net/SFTP.pm line 24',
          'new called at -e line 1'

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sub can {
  my ($obj, $meth) = (@_);
...
  return $f if defined $f;
  return;
}