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$ perl -Mwarnings -Mstrict -MData::Dumper -E' my @foo = ( [qw/ a b c /], undef ); ... ' a b c Can't use an undefined value as an ARRAY reference at -e line 3.
$ perl -Mwarnings -Mstrict -MData::Dumper -E' my @foo = ( [qw/ a b c /], undef ); ... ' a b c