module Mail::AddressLists

def _nt_primary_address
  start_index = index
  if node_cache[:primary_address].has_key?(index)
    cached = node_cache[:primary_address][index]
    if cached
      cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end
  i0 = index
  r1 = _nt_address_list
  r1.extend(PrimaryAddress0)
  if r1
    r0 = r1
  else
    r2 = _nt_obs_addr_list
    r2.extend(PrimaryAddress1)
    if r2
      r0 = r2
    else
      @index = i0
      r0 = nil
    end
  end
  node_cache[:primary_address][start_index] = r0
  r0
end

def root
  @root ||= :primary_address
end