You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: block_owner.rb
    path of file: ./repos/transpec/lib/transpec/syntax/mixin
    
    the code of the file until where you have to start completion: # coding: utf-8

require 'active_support/concern'
require 'transpec/syntax/mixin/send'
require 'transpec/util'

module Transpec
  class Syn
    
        def convert_singleline_block_to_multiline!
          return unless block_has_body? # TODO

          has_inserted_linefeed = false

          if block_beginning_line == block_body_line
            replace(range_between_block_begin_and_body, "\n#{block_base_indentation}  ")
            has_inserted_linefeed = true
          end