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: completion.rb
    path of file: ./repos/powerstation/powerstation/lib/compiled-jruby/lib/ruby/stdlib/irb
    
    the code of the file until where you have to start completion: #
#   irb/completor.rb -
#   	$Release Version: 0.9$
#   	$Revision$
#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
#       From Original Idea of shugo@ruby-lang.org
#

require "readline"

module IRB
  module InputCompletor # :nodoc:


    # Set of reserved words used by Ruby, you should not use these for
    # constants or variables
    ReservedWords = %w[
      BEGIN END
      alias and
      begin break
      case class
      def defined do
      else elsif end ensure
      false for
      if in
      module
      next nil not
      or
      redo rescue retry return
      self super
      then true
      undef unless until
      when while
      yield
    ]

    CompletionProc = proc { |input|
      bind = IRB.conf[:MAIN_CONTEXT].workspace.binding

      case input
      when /^((["'`]).*\2)\.([^.]*)$/
        # String
        receiver = $1
        message = Regexp.quote($3)

        candidates = String.instance_methods.collect{|m| m.to_s}
        select_message(receiver, message, candidates)

      when /^(\/[^\/]*\/)\.([^.]*)$
    
      def defined do
      else elsif end ensure
      false for
      if in
      module
      next nil not
      or
      redo rescue retry return
      self super
      then true
      undef unless until
      when while
      yield
    ]

    CompletionProc = proc { |input|
      bind = IRB.conf[:MAIN_CONTEXT].workspace.binding

      case input
      when /^((["'`]).*\2)\.([^.]*)$/
        # String
        receiver = $1
        message = Regexp.quote($3)

        candidates = String.instance_methods.collect{|m| m.to_s}
        select_message(receiver, message, candidates)

      when /^(\/[^\/]*\/)\.([^.]*)$/
        # Regexp
        receiver = $1
        message = Regexp.quote($2)

        candidates = Regexp.instance_methods.collect{|m| m.to_s}
        select_message(receiver, message, candidates)

      when /^([^\]]*\])\.([^.]*)$/
        # Array
        receiver = $1
        message = Regexp.quote($2)

        candidates = Array.instance_methods.collect{|m| m.to_s}
        select_message(receiver, message, candidates)

      when /^([^\}]*\})\.([^.]*)$/
        # Proc or Hash
        receiver = $1
        message = Regexp.quote($2)

        candidates = Proc.instance_methods.collect{|m| m.to_s}
        candidates |= Hash.instance_methods.collect{|m| m.to_s}
        select_message(receiver, message, candidates)

      when /^(:[^:.]*)$/
        # Symbol
        if Symbol.respond_to?(:all_symbols)
          sym = $1
          candidates = Symbol.all_symbols.collect{|s| ":" + s.id2name}
          candidates.grep(/^#{Regexp.quote(sym)}/)
        else
          []
        end