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  1. or download this
    $ 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.
  2. or download this
    $ perl -Mwarnings -Mstrict -MData::Dumper -E'
my @foo = ( [qw/ a b c /], undef );
...
'
a b c