io@COMP:C>cat sw.pl

use strict;

0

use warnings;

io@COMP:C>perl sw.pl

"use" not allowed in expression at sw.pl line 5, at end of line
syntax error at sw.pl line 5, near "use warnings"
Execution of sw.pl aborted due to compilation errors.

io@COMP:C>cat ws.pl

use warnings;

0

use strict;

io@COMP:C>perl ws.pl

"use" not allowed in expression at ws.pl line 5, at end of line
syntax error at ws.pl line 5, near "use strict"
Execution of ws.pl aborted due to compilation errors.


##</code><code>##

io@COMP:C>cat sw.pl

use strict;
$x=1;
use warnings;

io@COMP:C>perl sw.pl

Global symbol "$x" requires explicit package name (did you forget to declare "my $x"?) at sw.pl line 2.
BEGIN not safe after errors--compilation aborted at sw.pl line 3.


io@COMP:C>cat ws.pl

use warnings;
$x=1;
use strict;

io@COMP:C>perl ws.pl

Name "main::x" used only once: possible typo at ws.pl line 2.