const (
	_ = 1_000 // ERROR "underscore in numeric literal requires go1.13 or later \(-lang was set to go1.12; check go.mod\)|requires go1.13"
	_ = 0b111 // ERROR "binary literal requires go1.13 or later"
	_ = 0o567 // ERROR "0o/0O-style octal literal requires go1.13 or later"
	_ = 0xabc // ok
	_ = 0x0p1 // ERROR "hexadecimal floating-point literal requires go1.13 or later"

	_ = 0b111 // ERROR "binary"
	_ = 0o567 // ERROR "octal"
	_ = 0xabc // ok

package p

// numeric literals
const (
	_ = 1_000 // ERROR "underscore in numeric literal requires go1.13 or later"
	_ = 0b111 // ERROR "binary literal requires go1.13 or later"
	_ = 0o567 // ERROR "0o/0O-style octal literal requires go1.13 or later"
	_ = 0xabc // ok
	_ = 0x0p1 // ERROR "hexadecimal floating-point literal requires go1.13 or later"

	_ = 0b111 // ERROR "binary"
	_ = 0o567 // ERROR "octal"
	_ = 0xabc // ok

//
// The base argument must be 0 or a value from 2 through MaxBase. If the base
// is 0, the string prefix determines the actual conversion base. A prefix of
// “0b” or “0B” selects base 2; a “0”, “0o”, or “0O” prefix selects
// base 8, and a “0x” or “0X” prefix selects base 16. Otherwise the selected
// base is 10.
func (z *Int) scan(r io.ByteScanner, base int) (*Int, int, error) {
	// determine sign

package p

const (
	_ = 1_       // ERROR "'_' must separate successive digits"
	_ = 0b       // ERROR "binary literal has no digits|invalid numeric literal"
	_ = 0o       // ERROR "octal literal has no digits|invalid numeric literal"
	_ = 0x       // ERROR "hexadecimal literal has no digits|invalid numeric literal"
	_ = 0xde__ad // ERROR "'_' must separate successive digits"

		{IntLit, "0O1234", "0O1234", ""},

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

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

		{"0o0e+10", 0},
		{"-0o0e-10", -zero_},
		{"0o12", 10},
		{"0O12E2", 1000},
		{"0o.4", 0.5},
		{"0o.01", 0.015625},
		{"0o.01e3", 15.625},

		// octal mantissa, binary exponent
		{"0o0p+10", 0},
		{"-0o0p-10", -zero_},
		{"0o.12p6", 10},
		{"0o4p-3", 0.5},
		{"0o0014p-6", 0.1875},
		{"0o.001p9", 1},
		{"0o0.01p7", 2},
		{"0O0.01P+2", 0.0625},

		// hexadecimal mantissa and exponent

// license that can be found in the LICENSE file.

// Test Go2 literal syntax for basic types.
// Avoid running gofmt on this file to preserve the
// test cases with upper-case prefixes (0B, 0O, 0X).

package main

import "fmt"

func assert(cond bool) {
	if !cond {
		panic("assertion failed")
	}
}

func equal(x, y interface{}) bool {
	if x != y {
		fmt.Printf("%g != %g\n", x, y)

		{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"},

		{Int, "0O1234", "0O1234", ""},

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

		// octal floats (invalid)
		{Float, "0o.", "0o.", "invalid radix point in octal literal"},
		{Float, "0o.2", "0o.2", "invalid radix point in octal literal"},

// 0, 2, 8, 10, or 16. Providing an invalid base argument leads to a run-
// time panic.
//
// For base 0, the number prefix determines the actual base: A prefix of
// “0b” or “0B” selects base 2, “0o” or “0O” selects base 8, and
// “0x” or “0X” selects base 16. If fracOk is false, a “0” prefix
// (immediately followed by digits) selects base 8 as well. Otherwise,
// the selected base is 10 and no prefix is accepted.
//