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: proc.rb
    path of file: ./repos/ferrocarril/mruby-sys/vendor/mruby-bc7c5d3/test/t
    
    the code of the file until where you have to start completion: ##
# Proc ISO Test
    
  def m(&b) b end

  assert_equal m{}.class, Proc

  assert_raise LocalJumpError do
    m{ break }.call
  end
end