{token.INT, "0o", "0o", "octal literal has no digits"},
		{token.INT, "0o8123", "0o8123", "invalid digit '8' in octal literal"},
		{token.INT, "0o1293", "0o1293", "invalid digit '9' in octal literal"},
		{token.INT, "0o12a3", "0o12 a3", ""}, // only accept 0-9

		{token.FLOAT, "0o.", "0o.", "invalid radix point in octal literal"},
		{token.FLOAT, "0o.2", "0o.2", "invalid radix point in octal literal"},

Boolean:

	%t	the word true or false

Integer:

	%b	base 2
	%c	the character represented by the corresponding Unicode code point
	%d	base 10
	%o	base 8
	%O	base 8 with 0o prefix
	%q	a single-quoted character literal safely escaped with Go syntax.
	%x	base 16, with lower-case letters for a-f
	%X	base 16, with upper-case letters for A-F
	%U	Unicode format: U+1234; same as "U+%04X"

// floating-point number optionally followed by an exponent.
// If a fraction is provided, both the dividend and the divisor may be a
// decimal integer or independently use a prefix of “0b”, “0” or “0o”,
// or “0x” (or their upper-case variants) to denote a binary, octal, or
// hexadecimal integer, respectively. The divisor may not be signed.
// If a floating-point number is provided, it may be in decimal form or

//
// The base argument must be 0 or a value between 2 and [MaxBase].
// For base 0, the number prefix determines the actual base: A prefix of
// “0b” or “0B” selects base 2, “0”, “0o” or “0O” selects base 8,
// and “0x” or “0X” selects base 16. Otherwise, the selected base is 10
// and no prefix is accepted.
//
// For bases <= 36, lower and upper case letters are considered the same:

// It is called only if the verb is %v.
func (s *ss) scanBasePrefix() (base int, digits string, zeroFound bool) {
	if !s.peek("0") {
		return 0, decimalDigits + "_", false
	}
	s.accept("0")
	// Special cases for 0, 0b, 0o, 0x.
	switch {
	case s.peek("bB"):
		s.consume("bB", true)
		return 0, binaryDigits + "_", true
	case s.peek("oO"):
		s.consume("oO", true)
		return 0, octalDigits + "_", true
	case s.peek("xX"):

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