--- aliasing ---
$x # 1 for $x->[0]; () # '', undef, [ undef ]
-$x # 1 for $x->[0]; () # '', undef, undef #
-$x # 1 for $x->[0]; () # '', undef, undef # +fetch
+$x # 1 for $x->[0]; () # '', undef, [ undef ] #
+$x # 1 for $x->[0]; () # '', undef, [ undef ] # +fetch
$x # 1 for $x->[0]; () # '', undef, [ undef ] # +exists
$x # 1 for $x->[0]; () # '', undef, [ undef ] # +delete
-$x # 1 for $x->[0]; () # '', undef, [ undef ] # +store
+$x # 1 for $x->[0]; () # qr/^Can't vivify reference/, undef, undef # +store
$x # $_ = 1 for $x->[0]; () # '', undef, [ 1 ]
-$x # $_ = 1 for $x->[0]; () # '', undef, undef #
-$x # $_ = 1 for $x->[0]; () # '', undef, undef # +fetch
+$x # $_ = 1 for $x->[0]; () # '', undef, [ 1 ] #
+$x # $_ = 1 for $x->[0]; () # '', undef, [ 1 ] # +fetch
$x # $_ = 1 for $x->[0]; () # '', undef, [ 1 ] # +exists
$x # $_ = 1 for $x->[0]; () # '', undef, [ 1 ] # +delete
-$x # $_ = 1 for $x->[0]; () # '', undef, [ 1 ] # +store
+$x # $_ = 1 for $x->[0]; () # qr/^Can't vivify reference/, undef, undef # +store
$x->[0] = 1 # 1 for $x->[0]; () # '', undef, [ 1 ] # +fetch
$x->[0] = 1 # 1 for $x->[1]; () # '', undef, [ 1, undef ] # +fetch