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  1. or download this
    push @{ $config->{groups}->{$last_group} }, $line;
  2. or download this
    my $ref_to_array = $config->{groups}->{$last_group}
push @$ref_to_array, $line;
  3. or download this
    my $ref_to_array = $config->{groups}->{$last_group}
push @$ref_to_array, $line;

# In case $ref_to_array was autovivified,
$config->{groups}->{$last_group} = $ref_to_array;
  4. or download this
    my $ref_to_array = $config->{groups}->{$last_group} ||= [];
push @$ref_to_array, $line;