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...
print "From STDIN: $line";
'
Unsafe code detected: 'private value' trapped by operation mask at (ev
+al 5) line 1.
  2. or download this
    use strict;
use warnings;
...
--output:--
$ perl 2.pl 'print "$x\n";'
Unsafe code detected: 'private value' trapped by operation mask at (ev
+al 5) line 1.