module RuboCop::Cop::TrailingComma

def avoid_comma(kind, comma_begin_pos, extra_info)
  range = range_between(comma_begin_pos, comma_begin_pos + 1)
  article = kind =~ /array/ ? 'an' : 'a'
  add_offense(range, range,
              format(MSG, 'Avoid', format(kind, article)) +
              "#{extra_info}.")
end