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  1. or download this
    % perl -Mstrict -le 'my $x; my @y = @$x; print "=> ", ref $x'
Can't use an undefined value as an ARRAY reference at -e line 1.
% perl -Mstrict -le 'my $x; sub {}->( @$x ); my @y = @$x; print "=> ",
+ ref $x'
=> ARRAY
  2. or download this
    % perl -Mstrict -le 'my $x; scalar( @$x ); my @y = @$x; print "=> ", r
+ef $x'
Can't use an undefined value as an ARRAY reference at -e line 1.