def skip_for_variable
      skip_tkspace(false)
      tk = get_tk
      skip_tkspace(false)
      tk = get_tk
      unget_tk(tk) unless tk.kind_of?(TkIN)
    end
def skip_for_variable
      skip_tkspace(false)
      tk = get_tk
      skip_tkspace(false)
      tk = get_tk
      unget_tk(tk) unless tk.kind_of?(TkIN)
    end
skip the var [in] part of a 'for' statement