help (Debugger::WhereCommand)

    # File cli/ruby-debug/commands/frame.rb, line 180
          def help(cmd)
            s = if cmd == 'where'
              %{
                w[here]\tdisplay stack frames
                }
                else
              %{
                bt|backtrace\t\talias for where - display stack frames
             }
                end
            s += %{
    Print the entire stack frame. Each frame is numbered, the most recent
    frame is 0. 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 -->.  }
          end