class RuboCop::Cop::Style::SymbolProc

def on_block(node)
  block_send, block_args, block_body = *node
  _breceiver, bmethod_name, bargs = *block_send
  # TODO: Rails-specific handling that we should probably make
  # configurable - https://github.com/bbatsov/rubocop/issues/1485
  # we should ignore lambdas & procs
  return if block_send == PROC_NODE
  return if [:lambda, :proc].include?(bmethod_name)
  return if ignored_method?(bmethod_name)
  # File.open(file) { |f| f.readlines }
  return if bargs
  return unless can_shorten?(block_args, block_body)
  _receiver, method_name, _args = *block_body
  add_offense(node,
              :expression,
              format(MSG,
                     method_name,
                     bmethod_name))
end