def rl_save_prompt()
@saved_local_prompt = @local_prompt
@saved_local_prefix = @local_prompt_prefix
@saved_prefix_length = @prompt_prefix_length
@saved_local_length = @local_prompt_len
@saved_last_invisible = @prompt_last_invisible
@saved_visible_length = @prompt_visible_length
@saved_invis_chars_first_line = @prompt_invis_chars_first_line
@saved_physical_chars = @prompt_physical_chars
@local_prompt = @local_prompt_prefix = nil
@local_prompt_len = 0
@prompt_last_invisible = @prompt_visible_length = @prompt_prefix_length = 0
@prompt_invis_chars_first_line = @prompt_physical_chars = 0
end