FormatGNU

	// Schily's tar format, which is incompatible with USTAR.
	// This does not cover STAR extensions to the PAX format; these fall under
	// the PAX format.
	formatSTAR

	formatMax
)

func (f Format) has(f2 Format) bool   { return f&f2 != 0 }
func (f *Format) mayBe(f2 Format)     { *f |= f2 }
func (f *Format) mayOnlyBe(f2 Format) { *f &= f2 }
func (f *Format) mustNotBe(f2 Format) { *f &^= f2 }

			arg = buf.String()
		}
		args[i] = arg
	}
	return fmt.Sprintf(format, args...)
}

// check may be nil.
func (check *Checker) sprintf(format string, args ...any) string {
	var qf Qualifier
	if check != nil {
		qf = check.qualifier
	}
	return sprintf(qf, false, format, args...)
}

func (check *Checker) trace(pos syntax.Pos, format string, args ...any) {
	fmt.Printf("%s:\t%s%s\n",
		pos,

		isEqual := func() {
			if curTime, ok := got.(time.Time); ok {
				format := "2006-01-02T15:04:05Z07:00"

				if curTime.Round(time.Second).UTC().Format(format) != expect.(time.Time).Round(time.Second).UTC().Format(format) && curTime.Truncate(time.Second).UTC().Format(format) != expect.(time.Time).Truncate(time.Second).UTC().Format(format) {

		},
		{

			// check.errorf calls should have at least errorfMinArgCount arguments:
			// position, code, format string, and arguments to format
			if n := len(call.ArgList); n < errorfMinArgCount {
				t.Errorf("%s: got %d arguments, want at least %d", call.Pos(), n, errorfMinArgCount)
				return false
			}
			format := call.ArgList[errorfFormatIndex]
			syntax.Inspect(format, func(n syntax.Node) bool {

	fmtDebug
	fmtTypeID
	fmtTypeIDName
)

// Sym

// Format implements formatting for a Sym.
// The valid formats are:
//
//	%v	Go syntax: Name for symbols in the local package, PkgName.Name for imported symbols.
//	%+v	Debug syntax: always include PkgName. prefix even for local names.
//	%S	Short syntax: Name only, no matter what.
func (s *Sym) Format(f fmt.State, verb rune) {
	mode := fmtGo
	switch verb {
	case 'v', 'S':

	xprintf(format, "GOFLAGS", "")
	xprintf(format, "GOHOSTARCH", gohostarch)
	xprintf(format, "GOHOSTOS", gohostos)
	xprintf(format, "GOOS", goos)
	xprintf(format, "GOPROXY", os.Getenv("GOPROXY"))
	xprintf(format, "GOROOT", goroot)
	xprintf(format, "GOTMPDIR", os.Getenv("GOTMPDIR"))
	xprintf(format, "GOTOOLDIR", tooldir)
	if goarch == "arm" {
		xprintf(format, "GOARM", goarm)
	}
	if goarch == "arm64" {

	err.report()
}

func (check *Checker) errorf(at poser, code Code, format string, args ...any) {
	err := check.newError(code)
	err.addf(at, format, args...)
	err.report()
}

func (check *Checker) softErrorf(at poser, code Code, format string, args ...any) {
	err := check.newError(code)
	err.addf(at, format, args...)
	err.soft = true
	err.report()
}

	cmd.Stderr = new(strings.Builder)
	out, err := cmd.Output()
	if err != nil {
		t.Fatalf("%v: %v\n%s", cmd, err, cmd.Stderr)
	}

	alldocs, err := format.Source(out)
	if err != nil {
		t.Fatalf("format.Source($(%v)): %v", cmd, err)
	}

	const srcPath = `alldocs.go`
	old, err := os.ReadFile(srcPath)
	if err != nil {
		t.Fatalf("error reading %s: %v", srcPath, err)
	}

//
// The indexed export data format is an evolution of the previous
// binary export data format. Its chief contribution is introducing an
// index table, which allows efficient random access of individual
// declarations and inline function bodies. In turn, this allows
// avoiding unnecessary work for compilation units that import large
// packages.
//
//
// The top-level data format is structured as:
//
//     Header struct {