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#!/usr/bin/perl

...
($output, $error)=run();
print "$output, $error\n";

$ ./test_eval.pl
, Error: Could not execute not_a_command: open3: exec of not_a_command
+ failed at ./test_eval.pl line 22

  ...
  if (!$pid) {
...
      POSIX::_exit($!);
  }
  ...