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

package main

func ascii(r rune) rune {
	switch {
	case 97 <= r && r <= 122:
		return r - 32
	case 65 <= r && r <= 90:
		return r + 32
	default:
		return r
	}
}

func main() {
	nomeObjeto := "ABE1FK21"
	println(string(nomeObjeto[1:4]))
	println(ascii(rune(nomeObjeto[4])) >= 48 && ascii(rune(nomeObjeto[4])) <= 57)
	println(string(nomeObjeto[5]))

// ERROR "newline in character literal|newline in rune literal"
// ERROR "invalid character literal \(missing closing '\)|rune literal not terminated"

const (
	_ = ''     // ERROR "empty character literal or unescaped ' in character literal|empty rune literal"
	_ = 'f'
	_ = 'foo'  // ERROR "invalid character literal \(more than one character\)|more than one character in rune literal"
//line issue15611.go:11
	_ = '

//	2..0  case mode
//
// For the non-exceptional cases, a rune must be either uncased, lowercase or
// uppercase. If the rune is cased, the XOR pattern maps either a lowercase
// rune to uppercase or an uppercase rune to lowercase (applied to the 10
// least-significant bits of the rune).
//
// See the definitions below for a more detailed description of the various
// bits.
type info uint16

	case OpLiteral:
		for _, r := range re.Rune {
			escape(b, r, false)
		}
	case OpCharClass:
		if len(re.Rune)%2 != 0 {
			b.WriteString(`[invalid char class]`)
			break
		}
		b.WriteRune('[')
		if len(re.Rune) == 0 {
			b.WriteString(`^\x00-\x{10FFFF}`)
		} else if re.Rune[0] == 0 && re.Rune[len(re.Rune)-1] == unicode.MaxRune && len(re.Rune) > 2 {
			// Contains 0 and MaxRune. Probably a negated class.

	r = '\x00'
	for i, r = range s {
		b[i] = byte(r)
	}
	if want := n - 1; i != want {
		fmt.Printf("index after range with side-effect = %d want %d\n", i, want)
		os.Exit(1)
	}
	if want := rune(n); r != want {
		fmt.Printf("rune after range with side-effect = %q want %q\n", r, want)
		os.Exit(1)
	}

	i = -1
	// i is shadowed here, so its value should be unchanged.
	for i := range s {
		b[i] = s[i]
	}

var _ = true == '\'' // ERROR "invalid operation: (cannot compare true)|(true) == '\\'' \(mismatched types untyped bool and untyped rune\)"

package main

import (
	"fmt"
	"os"
	"unicode/utf8"
)

func main() {
	s := "\000\123\x00\xca\xFE\u0123\ubabe\U0000babe\U0010FFFFx"
	expect := []rune{0, 0123, 0, 0xFFFD, 0xFFFD, 0x123, 0xbabe, 0xbabe, 0x10FFFF, 'x'}
	offset := 0
	var i int
	var c rune
	ok := true
	cnum := 0
	for i, c = range s {
		r, size := utf8.DecodeRuneInString(s[i:len(s)]) // check it another way
		if i != offset {

	c.inst(InstFail)
}

var anyRuneNotNL = []rune{0, '\n' - 1, '\n' + 1, unicode.MaxRune}
var anyRune = []rune{0, unicode.MaxRune}

func (c *compiler) compile(re *Regexp) frag {
	switch re.Op {
	case OpNoMatch:
		return c.fail()
	case OpEmptyMatch:
		return c.nop()
	case OpLiteral:
		if len(re.Rune) == 0 {
			return c.nop()
		}
		var f frag
		for j := range re.Rune {
			f1 := c.rune(re.Rune[j:j+1], re.Flags)

				c, name)
		}
	}
	if !isAlphaNumeric(rune(name[len(name)-1])) {
		return fmt.Errorf("invalid name %q, should end with a letter or digit", name)
	}
	return nil
}

func isLetter(c rune) bool {
	return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z')
}

func isDigit(c rune) bool {
	return '0' <= c && c <= '9'
}

func isAlphaNumeric(c rune) bool {
	return isLetter(c) || isDigit(c)

		}
	}
	return
}

func (s *Scanner) scanNumber(ch rune, seenDot bool) (rune, rune) {
	base := 10         // number base
	prefix := rune(0)  // one of 0 (decimal), '0' (0-octal), 'x', 'o', or 'b'
	digsep := 0        // bit 0: digit present, bit 1: '_' present
	invalid := rune(0) // invalid digit in literal, or 0

	// integer part
	var tok rune
	var ds int
	if !seenDot {
		tok = Int
		if ch == '0' {