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$rc = system { "lskdfj" } "lskdfj";
unless( ok($rc == 255 << 8 or $rc == -1 or $rc == 256 or $rc == 512) )
+ {
     print "# \$rc == $rc\n";
...
             $! == 22 or  $! =~ /invalid argument/i  ) ) {
    printf "# \$! eq %d, '%s'\n", $!, $!;
}