use strict;
if (@_)
{
 my $var = "ok";
}
print "$var\n";

##</code><code>##

Global symbol "$var" requires explicit package name at test2.pl line 6.
Execution of test2.pl aborted due to compilation errors.

##</code><code>##

use strict;
my $var = "ok" if (@_);
print "$var\n";