}
	newList := make([]ir.Node, 0, need)
	for i := 0; i < len(s); i++ {
		if ir.IsConst(s[i], constant.String) && i+1 < len(s) && ir.IsConst(s[i+1], constant.String) {
			// merge from i up to but not including i2
			var strs []string
			i2 := i
			for i2 < len(s) && ir.IsConst(s[i2], constant.String) {
				strs = append(strs, ir.StringVal(s[i2]))
				i2++
			}

// When ok = false, rangeKeyVal may also return a reason in cause.
func rangeKeyVal(typ Type, allowVersion func(goVersion) bool) (key, val Type, cause string, isFunc, ok bool) {
	bad := func(cause string) (Type, Type, string, bool, bool) {
		return Typ[Invalid], Typ[Invalid], cause, false, false
	}
	toSig := func(t Type) *Signature {
		sig, _ := coreType(t).(*Signature)
		return sig
	}

func Callee(n ir.Node) ir.Node {
	return typecheck(n, ctxExpr|ctxCallee)
}

var traceIndent []byte

func tracePrint(title string, n ir.Node) func(np *ir.Node) {
	indent := traceIndent

	// guard against nil
	var pos, op string
	var tc uint8
	if n != nil {
		pos = base.FmtPos(n.Pos())
		op = n.Op().String()
		tc = n.Typecheck()
	}

	types.SkipSizeForTracing = true
	defer func() { types.SkipSizeForTracing = false }()

// When ok = false, rangeKeyVal may also return a reason in cause.
func rangeKeyVal(typ Type, allowVersion func(goVersion) bool) (key, val Type, cause string, isFunc, ok bool) {
	bad := func(cause string) (Type, Type, string, bool, bool) {
		return Typ[Invalid], Typ[Invalid], cause, false, false
	}
	toSig := func(t Type) *Signature {
		sig, _ := coreType(t).(*Signature)
		return sig
	}

var UntypedTypes = [...]*Type{
	constant.Bool:    UntypedBool,
	constant.String:  UntypedString,
	constant.Int:     UntypedInt,
	constant.Float:   UntypedFloat,
	constant.Complex: UntypedComplex,
}

// DefaultKinds maps from a constant.Kind to its default Kind.
var DefaultKinds = [...]Kind{
	constant.Bool:    TBOOL,
	constant.String:  TSTRING,
	constant.Int:     TINT,
	constant.Float:   TFLOAT64,

import (
	"bytes"
	"encoding/binary"
	"fmt"
	"internal/saferio"
	"io"
)

// cstring converts ASCII byte sequence b to string.
// It stops once it finds 0 or reaches end of b.
func cstring(b []byte) string {
	i := bytes.IndexByte(b, 0)
	if i == -1 {
		i = len(b)
	}
	return string(b[:i])
}

// StringTable is a COFF string table.
type StringTable []byte

// that might overflow; otherwise it returns the empty string.
func opName(e ast.Expr) string {
	switch e := e.(type) {
	case *ast.BinaryExpr:
		if int(e.Op) < len(op2str2) {
			return op2str2[e.Op]
		}
	case *ast.UnaryExpr:
		if int(e.Op) < len(op2str1) {
			return op2str1[e.Op]
		}
	}
	return ""
}

var op2str1 = [...]string{
	token.XOR: "bitwise complement",
}

// that might overflow; otherwise it returns the empty string.
func opName(x syntax.Expr) string {
	if e, _ := x.(*syntax.Operation); e != nil {
		op := int(e.Op)
		if e.Y == nil {
			if op < len(op2str1) {
				return op2str1[op]
			}
		} else {
			if op < len(op2str2) {
				return op2str2[op]
			}
		}
	}
	return ""
}

var op2str1 = [...]string{
	syntax.Xor: "bitwise complement",
}

	return uint64(lo) | uint64(hi)<<32, b[8:]
}

// gstring reads a string from b, prefixed with a 16-bit length in little-endian order.
// It returns the string with the remaining slice of b and a boolean. If the length is
// greater than the number of bytes in b, the boolean will be false.
func gstring(b []byte) (string, []byte, bool) {
	n, b := gbit16(b)
	if int(n) > len(b) {
		return "", b, false
	}

Ian Lance Taylor <******@****.***> 1326931944 -0800