// signed integer of the given size, err.Err = [ErrRange] and the
// returned value is the maximum magnitude integer of the
// appropriate bitSize and sign.
//
// [integer literals]: https://go.dev/ref/spec#Integer_literals
func ParseInt(s string, base int, bitSize int) (i int64, err error) {
	const fnParseInt = "ParseInt"

	if s == "" {
		return 0, syntaxError(fnParseInt, s)
	}

	// Pick off leading sign.
	s0 := s

        assertSuccess(parser("0B0"))
        assertSuccess(parser("0b101010"))
        assertSuccess(parser("0b10101_0"))

        assertFailure(
            parser("bar"),
            "Expecting token of type INTEGER_LITERAL, but got IDENTIFIER ('bar') instead"
        )
    }

    @Test
    fun `can parse floating point numbers`() {
        val parser = combinator.floatLiteral

        assertSuccess(parser("0e0"))