}

func TestZeroTok(t *testing.T) {
	// zero value for token.Token must be token.ILLEGAL
	var zero token.Token
	if token.ILLEGAL != zero {
		t.Errorf("%s == %d; want 0", token.ILLEGAL, zero)
	}
}

func TestAssignOp(t *testing.T) {
	// there are fewer than 256 tokens
	for i := 0; i < 256; i++ {
		tok := token.Token(i)
		got := assignOp(tok)
		want := assignOps[tok]
		if got != want {