my @array = @{ sub_returning_aref() };

##</code><code>##

my $aref = sub_returning_aref();

##</code><code>##

my @array = sub_returning_list();

##</code><code>##

my $aref = [ sub_returning_list() ];

##</code><code>##

my @array = keys %hash;
my $aref  = [ keys %hash ];