+--- dereferencing ---
+
+$x # no warnings 'uninitialized'; my @a = @$x; () # ($strict ? qr/Can't use an undefined value as an ARRAY reference/ : ''), undef, undef
+$x # no warnings 'uninitialized'; my @a = @$x; () # ($strict ? qr/Can't use an undefined value as an ARRAY reference/ : ''), undef, undef #
+$x # no warnings 'uninitialized'; my @a = @$x; () # ($strict ? qr/Can't use an undefined value as an ARRAY reference/ : ''), undef, undef # +fetch
+$x # no warnings 'uninitialized'; my @a = @$x; () # ($strict ? qr/Can't use an undefined value as an ARRAY reference/ : ''), undef, undef # +exists
+$x # no warnings 'uninitialized'; my @a = @$x; () # ($strict ? qr/Can't use an undefined value as an ARRAY reference/ : ''), undef, undef # +delete
+$x # no warnings 'uninitialized'; my @a = @$x; () # ($strict ? qr/Can't use an undefined value as an ARRAY reference/ : ''), undef, undef # +store
+
+$x->[0] = 1 # my @a = @$x; () # '', undef, [ 1 ] # +fetch
+$x->[0] = 1 # my @a = @$x; () # '', undef, [ 1 ] # +exists
+$x->[0] = 1 # my @a = @$x; () # '', undef, [ 1 ] # +delete
+$x->[0] = 1 # my @a = @$x; () # '', undef, [ 1 ] # +store
+