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    \$\begingroup\$ ._. Now ... if only perl errors on the empty file! \$\endgroup\$ Commented Jul 22, 2017 at 1:34
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    \$\begingroup\$ Wait, is this a violation of the "may not be generated by the program itself"? I didn't understand what that rule was saying. \$\endgroup\$ Commented Jul 22, 2017 at 1:41
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    \$\begingroup\$ @Zacharý ... giving an error message with total length negative one? \$\endgroup\$ Commented Jul 22, 2017 at 1:54
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    \$\begingroup\$ This might be invalid ... or not, depends on whether the OP meant the error or the error message \$\endgroup\$ Commented Jul 22, 2017 at 2:14
  • \$\begingroup\$ ^ clarification: whether a program errors directly or creates an error message directly \$\endgroup\$ Commented Jul 23, 2017 at 0:31