# File lib/pry/pry_instance.rb, line 588
  def readline(current_prompt="> ", completion_proc=nil)
    handle_read_errors do

      if defined? Coolline and input.is_a? Coolline
        input.completion_proc = proc do |cool|
          completion_proc.call cool.completed_word
        end
      elsif input.respond_to? :completion_proc=
        input.completion_proc = completion_proc
      end

      if input == Readline
        input.readline(current_prompt, false) # false since we'll add it manually
      elsif defined? Coolline and input.is_a? Coolline
        input.readline(current_prompt)
      else
        if input.method(:readline).arity == 1
          input.readline(current_prompt)
        else
          input.readline
        end
      end
    end
  end