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  1. or download this
    my @array = map { LISTS => [ map [], 1..$length ] }, 1..$arr_len;
  2. or download this
    my @array = map { 'foo' => $_ }, 1..3;    # ok

my @array = map { $_ => 'foo' }, 1..3;    # not ok: 'syntax error at .
+.., near "},"'
  3. or download this
    my @array = map +{ $_ => 'foo' }, 1..3;   # ok