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: generated_descriptions.rb
    path of file: ./repos/rspec-expectations/lib/rspec/matchers
    
    the code of the file until where you have to start completion: module RSpec
  module Matchers
    class << self
      # @private
      attr_accessor :last_matcher, :last_expectation_handler
    end

    # @api private
    # Used by rspec-core to 
    
    def self.last_description
      last_matcher.respond_to?(:description) ? last_matcher.description : <<-MESSAGE
When you call a matcher in an example without a String, like this:

specify { expect(object).to matcher }

or this:

it { is_expected.to matcher }

RSpec expects the matcher to have a #description method. You should either
add a String to the example this matcher is being used in, or give it a
description method. Then you won't have to suffer this lengthy warning again.
MESSAGE
    end