get_constant_with_optional_parens

# File lib/rdoc/parsers/parse_rb.rb, line 2224
    def get_constant_with_optional_parens
      skip_tkspace(false)
      nest = 0
      while (tk = peek_tk).kind_of?(TkLPAREN)  || tk.kind_of?(TkfLPAREN)
        get_tk
        skip_tkspace(true)
        nest += 1
      end

      name = get_constant

      while nest > 0
        skip_tkspace(true)
        tk = get_tk
        nest -= 1 if tk.kind_of?(TkRPAREN)
      end
      name
    end