{"0b2", 0, false, nil, 2, 0, errNoDigits, '2'},
	{"0B2", 0, false, nil, 2, 0, errNoDigits, '2'},
	{"0o8", 0, false, nil, 8, 0, errNoDigits, '8'},
	{"0O8", 0, false, nil, 8, 0, errNoDigits, '8'},
	{"0xg", 0, false, nil, 16, 0, errNoDigits, 'g'},
	{"0Xg", 0, false, nil, 16, 0, errNoDigits, 'g'},
	{"345", 2, false, nil, 2, 0, errNoDigits, '3'},

	// invalid: incorrect use of decimal point
	{"._", 0, true, nil, 10, 0, errNoDigits, 0},

	{in: ""},
	{in: "a"},
	{in: "z"},
	{in: "+"},
	{in: "-"},
	{in: "0b"},
	{in: "0o"},
	{in: "0x"},
	{in: "0y"},
	{in: "2", base: 2},
	{in: "0b2", base: 0},
	{in: "08"},
	{in: "8", base: 8},
	{in: "0xg", base: 0},
	{in: "g", base: 16},

	// invalid inputs with separators
	// (smoke tests only - a comprehensive set of tests is in natconv_test.go)
	{in: "_"},
	{in: "0_"},
	{in: "_0"},
	{in: "-1__0"},

	testError(t, `01238123`, "<input>:1:9", "invalid digit '8' in octal literal", Int)
	testError(t, `0x`, "<input>:1:3", "hexadecimal literal has no digits", Int)
	testError(t, `0xg`, "<input>:1:3", "hexadecimal literal has no digits", Int)
	testError(t, `'aa'`, "<input>:1:4", "invalid char literal", Char)
	testError(t, `1.5e`, "<input>:1:5", "exponent has no digits", Float)