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: name_error.rb
    path of file: ./repos/brew/Library/Homebrew/vendor/bundle-standalone/ruby/2.3.0/gems/activesupport-5.2.2/lib/active_support/core_ext
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class NameError
  # Extract the name of the missing constant from the exception message.
  #
  #   begin
  #     HelloWorld
  #
    
  def missing_name
    # Since ruby v2.3.0 `did_you_mean` gem is loaded by default.
    # It extends NameError#message with spell corrections which are SLOW.
    # We should use original_message message instead.
    message = respond_to?(:original_message) ? original_message : self.message

    if /undefined local variable or method/ !~ message
      $1 if /((::)?([A-Z]\w*)(::[A-Z]\w*)*)$/ =~ message
    end