@$arrayref;

##</code><code>##

#!/usr/bin/perl -w
use strict;

my $arrayref;
@$arrayref;    # line 5
print "ok";

##</code><code>##

Useless use of a variable in void context at test.pl line 5.
Can't use an undefined value as an ARRAY reference at test.pl line 5.

##</code><code>##

if ($arrayref) { ... }

##</code><code>##

#!/usr/bin/perl -w
use strict;

my $arrayref = 1;
for (@$arrayref) {
    print "ok\n";
}

##</code><code>##

Can't use string ("1") as an ARRAY ref while "strict refs" in use at test.pl line 5.