wantText: "",
			wantJSON: "{}",
		},
		{
			name:     "remove built-in",
			replace:  removeKeys(TimeKey, LevelKey, MessageKey),
			attrs:    attrs,
			wantText: "a=one b=2",
			wantJSON: `{"a":"one","b":2}`,
		},
		{
			name:     "preformatted remove built-in",
			replace:  removeKeys(TimeKey, LevelKey, MessageKey),
			with:     func(h Handler) Handler { return h.WithAttrs(preAttrs) },
			attrs:    attrs,

	checks []check
}

var cases = []testCase{
	{
		name:        "built-ins",
		explanation: withSource("this test expects slog.TimeKey, slog.LevelKey and slog.MessageKey"),
		f: func(l *slog.Logger) {
			l.Info("message")
		},
		checks: []check{
			hasKey(slog.TimeKey),
			hasKey(slog.LevelKey),
			hasAttr(slog.MessageKey, "message"),
		},
	},
	{
		name:        "attrs",

// RemoveTime removes the top-level time attribute.
// It is intended to be used as a ReplaceAttr function,
// to make example output deterministic.
func RemoveTime(groups []string, a slog.Attr) slog.Attr {
	if a.Key == slog.TimeKey && len(groups) == 0 {
		return slog.Attr{}
	}
	return a

	r, _ := http.NewRequest("GET", "localhost", nil)
	// ...

	logger := slog.New(
		slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
			ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
				if a.Key == slog.TimeKey && len(groups) == 0 {
					return slog.Attr{}
				}
				return a
			},
		}),
	)
	logger.Info("finished",
		slog.Group("req",
			slog.String("method", r.Method),
			slog.String("url", r.URL.String())),

	_ = logger.Handler().Handle(context.Background(), r)
}

func Example_wrapping() {
	replace := func(groups []string, a slog.Attr) slog.Attr {
		// Remove time.
		if a.Key == slog.TimeKey && len(groups) == 0 {
			return slog.Attr{}
		}
		// Remove the directory from the source's filename.
		if a.Key == slog.SourceKey {
			source := a.Value.Any().(*slog.Source)
			source.File = filepath.Base(source.File)

		// LevelInfo, which would drop Debug and Trace logs.
		Level: LevelTrace,

		ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
			// Remove time from the output for predictable test output.
			if a.Key == slog.TimeKey {
				return slog.Attr{}
			}

			// Customize the name of the level key and the output string, including
			// custom level values.
			if a.Key == slog.LevelKey {
				// Rename the level key from "level" to "sev".

	// remove attributes from the output.
	ReplaceAttr func(groups []string, a Attr) Attr
}

// Keys for "built-in" attributes.
const (
	// TimeKey is the key used by the built-in handlers for the time
	// when the log method is called. The associated Value is a [time.Time].
	TimeKey = "time"
	// LevelKey is the key used by the built-in handlers for the level
	// of the log call. The associated value is a [Level].
	LevelKey = "level"

	InfoLevel:  zapcore.InfoLevel,
	WarnLevel:  zapcore.WarnLevel,
	ErrorLevel: zapcore.ErrorLevel,
	FatalLevel: zapcore.FatalLevel,
	NoneLevel:  none,
}

var defaultEncoderConfig = zapcore.EncoderConfig{
	TimeKey:        "time",
	LevelKey:       "level",
	NameKey:        "scope",
	CallerKey:      "caller",
	MessageKey:     "msg",
	StacktraceKey:  "stack",
	LineEnding:     zapcore.DefaultLineEnding,

		logBuf.Reset()
	}
}

// Test handlerWriter minimum level by calling slog.SetDefault.
func TestLogLoggerLevelForHandlerWriter(t *testing.T) {
	removeTime := func(_ []string, a Attr) Attr {
		if a.Key == TimeKey {
			return Attr{}
		}
		return a
	}

	// Revert any changes to the default logger. This is important because other
	// tests might change the default logger using SetDefault. Also ensure we

pkg log/slog, const MessageKey = "msg" #56345
pkg log/slog, const SourceKey ideal-string #56345
pkg log/slog, const SourceKey = "source" #56345
pkg log/slog, const TimeKey ideal-string #56345
pkg log/slog, const TimeKey = "time" #56345
pkg log/slog, func Any(string, interface{}) Attr #56345
pkg log/slog, func AnyValue(interface{}) Value #56345
pkg log/slog, func Bool(string, bool) Attr #56345