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: where.rb
    path of file: ./repos/byebug/lib/byebug/commands
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "pathname"
require_relative "../command"
require_relative "../helpers/frame"

module Byebug
  #
  # Show current backtrace.
  #
  class WhereCommand < Command
    include Helpers::FrameHelper

    self.allow_in_post_mortem = true

    def self.regexp
      /^\s* (?:w(?:here)?|bt|backtrace) (?:\s+(\S+))? \s*$/x
    
    
    def self.description
      <<-DESCRIPTION
        w[here]|bt|backtrace[ maximum-frame]

        #{short_description}

        Print the entire stack frame. Each frame is numbered; the most recent
        frame is 0. A frame number can be referred to in the "frame" command.
        "up" and "down" add or subtract respectively to frame numbers shown.
        The position of the current frame is marked with -->. C-frames hang
        from their most immediate Ruby frame to indicate that they are not
        navigable.

        Without an argument, the command prints all the frames. With an argument,
        the command prints the nth first frames, where n is the largest between
        the argument or the maximum stack frame.
      DESCRIPTION
    end