#!/usr/bin/perl

use strict;
use warnings;

my $ref = sub {print "Hello, world\n"};

$ref->();
&$ref();  # Look ma, I am using strict!

__END__
Hello, world
Hello, world

##</code><code>##

#!/usr/bin/perl

use strict;
use warnings;

sub hello {print "Hello, world\n"};

my $ref = "hello";

$ref->();

__END__
Can't use string ("hello") as a subroutine ref while "strict refs" in use