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  1. or download this
    $ perl -MData::Dump -e 'my $x; $x->[0]->{"aaa"}; dd $x'
[{}]
$ perl -MData::Dump -M-autovivification -e \
      'my $x; $x->[0]->{"aaa"}; dd $x'
undef
  2. or download this
    $ perl -MData::Dump -M-autovivification=strict,fetch -e \
      'my $x; $x->[0]->{"aaa"}; dd $x'
Reference vivification forbidden at -e line 1.