r2.AddAttrs(Int("p", 2))
	check(r1, r1Attrs) // r1 is unchanged
	check(r2, append(slices.Clip(r1Attrs), Int("p", 2)))
}

func newRecordWithAttrs(as []Attr) Record {
	r := NewRecord(time.Now(), LevelInfo, "", 0)
	r.AddAttrs(as...)
	return r
}

func attrsSlice(r Record) []Attr {
	s := make([]Attr, 0, r.NumAttrs())
	r.Attrs(func(a Attr) bool { s = append(s, a); return true })
	return s
}

	lfs       byFreq    // stored to avoid repeated allocation in generate
}

type literalNode struct {
	literal uint16
	freq    int32
}

// A levelInfo describes the state of the constructed tree for a given depth.
type levelInfo struct {
	// Our level.  for better printing
	level int32

	// The frequency of the last node at this level
	lastFreq int32

package benchmarks

import (
	"bytes"
	"context"
	"log/slog"
	"slices"
	"testing"
)

func TestHandlers(t *testing.T) {
	ctx := context.Background()
	r := slog.NewRecord(testTime, slog.LevelInfo, testMessage, 0)
	r.AddAttrs(testAttrs...)
	t.Run("text", func(t *testing.T) {
		var b bytes.Buffer
		h := newFastTextHandler(&b)
		if err := h.Handle(ctx, r); err != nil {
			t.Fatal(err)
		}
		got := b.String()

	defer log.SetFlags(log.Flags()) // revert changes after the example
	log.SetFlags(0)
	defer log.SetOutput(log.Writer()) // revert changes after the example
	log.SetOutput(os.Stdout)

	// Default logging level is slog.LevelInfo.
	log.Print("log debug") // log debug
	slog.Debug("debug")    // no output
	slog.Info("info")      // INFO info

	// Set the default logging level to slog.LevelDebug.

			sub2 := h.WithAttrs([]Attr{Bool("sub2", true)})
			var wg sync.WaitGroup
			for i := 0; i < count; i++ {
				sub1Record := NewRecord(time.Time{}, LevelInfo, "hello from sub1", 0)
				sub1Record.AddAttrs(Int("i", i))
				sub2Record := NewRecord(time.Time{}, LevelInfo, "hello from sub2", 0)
				sub2Record.AddAttrs(Int("i", i))
				wg.Add(1)
				go func() {
					defer wg.Done()

suppressing debug logging until it is needed.
The built-in handlers can be configured with the minimum level to output by
setting [HandlerOptions.Level].
The program's `main` function typically does this.
The default value is LevelInfo.

Setting the [HandlerOptions.Level] field to a [Level] value
fixes the handler's minimum level throughout its lifetime.
Setting it to a [LevelVar] allows the level to be varied dynamically.

	AddSource bool

	// Level reports the minimum record level that will be logged.
	// The handler discards records with lower levels.
	// If Level is nil, the handler assumes LevelInfo.
	// The handler calls Level.Level for each record processed;
	// to adjust the minimum level dynamically, use a LevelVar.
	Level Leveler

pkg log/slog, const LevelDebug = -4 #56345
pkg log/slog, const LevelDebug Level #56345
pkg log/slog, const LevelError = 8 #56345
pkg log/slog, const LevelError Level #56345
pkg log/slog, const LevelInfo = 0 #56345
pkg log/slog, const LevelInfo Level #56345
pkg log/slog, const LevelKey ideal-string #56345
pkg log/slog, const LevelKey = "level" #56345
pkg log/slog, const LevelWarn = 4 #56345
pkg log/slog, const LevelWarn Level #56345

		{"KindLogValuer", Const, 21},
		{"KindString", Const, 21},
		{"KindTime", Const, 21},
		{"KindUint64", Const, 21},
		{"Level", Type, 21},
		{"LevelDebug", Const, 21},
		{"LevelError", Const, 21},
		{"LevelInfo", Const, 21},
		{"LevelKey", Const, 21},
		{"LevelVar", Type, 21},
		{"LevelWarn", Const, 21},
		{"Leveler", Type, 21},
		{"Log", Func, 21},
		{"LogAttrs", Func, 21},
		{"LogValuer", Type, 21},