panic("BUG: bug236a")
	}
	if v2 != "cCdD" {
		panic("BUG: bug236b")
	}
	if v3 != "eEfFgGhHiI" {
		panic("BUG: bug236c")
	}

	switch "aAbB" {
	case f(1) + f(2):
	default:
		panic("BUG: bug236d")
	}

	switch "cCdD" {
	case g(f(3), f(4)):
	default:
		panic("BUG: bug236e")
	}

	switch "eEfFgGhHiI" {
	case f(5) + f(6) + f(7) + f(8) + f(9):
	default:
		panic("BUG: bug236f")
	}

	if s != "aAbB" {
		println("BUG: bug221a: ", s)
		panic("fail")
	}
	s = g(f(3), f(4))
	if s != "cCdD" {
		println("BUG: bug221b: ", s)
		panic("fail")
	}
	s = f(5) + f(6) + f(7) + f(8) + f(9)
	if s != "eEfFgGhHiI" {
		println("BUG: bug221c: ", s)
		panic("fail")
	}