diff --git a/kittens/choose_files/scan_test.go b/kittens/choose_files/scan_test.go
index 146cc8ed0..0d230a7ac 100644
--- a/kittens/choose_files/scan_test.go
+++ b/kittens/choose_files/scan_test.go
@@ -94,7 +94,7 @@ func (n node) ReadFile(name string) ([]byte, error) {
 		return nil, fs.ErrNotExist
 	}
 	p := &n
-	for _, x := range strings.Split(strings.Trim(name, string(os.PathSeparator)), string(os.PathSeparator)) {
+	for x := range strings.SplitSeq(strings.Trim(name, string(os.PathSeparator)), string(os.PathSeparator)) {
 		c, found := p.children[x]
 		if !found {
 			return nil, fs.ErrNotExist
@@ -109,7 +109,7 @@ func (n node) ReadDir(name string) ([]fs.DirEntry, error) {
 		return n.dir_entries(), nil
 	}
 	p := &n
-	for _, x := range strings.Split(strings.Trim(name, string(os.PathSeparator)), string(os.PathSeparator)) {
+	for x := range strings.SplitSeq(strings.Trim(name, string(os.PathSeparator)), string(os.PathSeparator)) {
 		c, found := p.children[x]
 		if !found {
 			return nil, fs.ErrNotExist
@@ -334,11 +334,11 @@ func TestSortedResults(t *testing.T) {
 }
 
 func run_scoring(b *testing.B, depth, breadth int, query string) {
-	b.StopTimer()
+
 	root := node{name: string(os.PathSeparator)}
 	root.generate_random_tree(depth, breadth)
-	b.StartTimer()
-	for range b.N {
+
+	for b.Loop() {
 		b.StopTimer()
 		wg := sync.WaitGroup{}
 		wg.Add(1)
diff --git a/kittens/choose_fonts/face.go b/kittens/choose_fonts/face.go
index 477a10289..aaa6dd0d7 100644
--- a/kittens/choose_fonts/face.go
+++ b/kittens/choose_fonts/face.go
@@ -101,7 +101,7 @@ func (self *face_panel) draw_axis(sz loop.ScreenSize, y int, ax VariableAxis, ax
 	}
 	frac := (min(axis_value, ax.Maximum) - ax.Minimum) / (ax.Maximum - ax.Minimum)
 	current_cell := int(math.Floor(frac * float64(num_of_cells-1)))
-	for i := 0; i < num_of_cells; i++ {
+	for i := range num_of_cells {
 		buf.WriteString(utils.IfElse(i == current_cell, lp.SprintStyled(current_val_style, `⬤`),
 			tui.InternalHyperlink("•", fmt.Sprintf("axis:%d/%d:%s", i, num_of_cells-1, ax.Tag))))
 	}
diff --git a/kittens/clipboard/read.go b/kittens/clipboard/read.go
index 663433671..e2e138caf 100644
--- a/kittens/clipboard/read.go
+++ b/kittens/clipboard/read.go
@@ -258,7 +258,7 @@ func parse_escape_code(etype loop.EscapeCodeType, data []byte) (metadata map[str
 		}
 	}
 	if len(parts) > 1 {
-		for _, record := range bytes.Split(parts[1], utils.UnsafeStringToBytes(":")) {
+		for record := range bytes.SplitSeq(parts[1], utils.UnsafeStringToBytes(":")) {
 			rp := bytes.SplitN(record, utils.UnsafeStringToBytes("="), 2)
 			v := ""
 			if len(rp) == 2 {
diff --git a/kittens/desktop_ui/portal.go b/kittens/desktop_ui/portal.go
index 9f010906e..c0595c0e4 100644
--- a/kittens/desktop_ui/portal.go
+++ b/kittens/desktop_ui/portal.go
@@ -452,7 +452,7 @@ Exec=%s desktop-ui run-server
 	patched_file := ""
 	desktops := utils.Filter(strings.Split(d, ":"), func(x string) bool { return x != "" })
 	desktops = append(desktops, "")
-	for _, x := range strings.Split(d, ":") {
+	for x := range strings.SplitSeq(d, ":") {
 		q := filepath.Join(cf, utils.IfElse(x == "", "portals.conf", fmt.Sprintf("%s-portals.conf", strings.ToLower(x))))
 		if text, err := os.ReadFile(q); err == nil {
 			text := patch_portals_conf(text)
diff --git a/kittens/diff/diff.go b/kittens/diff/diff.go
index da903b3a1..ca9b6667c 100644
--- a/kittens/diff/diff.go
+++ b/kittens/diff/diff.go
@@ -119,10 +119,7 @@ func Diff(oldName, old, newName, new string, num_of_context_lines int) []byte {
 
 		// End chunk with common lines for context.
 		if len(ctext) > 0 {
-			n := end.x - start.x
-			if n > C {
-				n = C
-			}
+			n := min(end.x-start.x, C)
 			for _, s := range x[start.x : start.x+n] {
 				ctext = append(ctext, " "+s)
 				count.x++
@@ -237,7 +234,7 @@ func tgs(x, y []string) []pair {
 	for i := range T {
 		T[i] = n + 1
 	}
-	for i := 0; i < n; i++ {
+	for i := range n {
 		k := sort.Search(n, func(k int) bool {
 			return T[k] >= J[i]
 		})
diff --git a/kittens/hints/marks.go b/kittens/hints/marks.go
index 1dab50887..b24da2f9d 100644
--- a/kittens/hints/marks.go
+++ b/kittens/hints/marks.go
@@ -79,7 +79,7 @@ func process_escape_codes(text string) (ans string, hyperlinks []Mark) {
 			active_hyperlink_url = url
 			active_hyperlink_start_offset = start
 			if metadata != "" {
-				for _, entry := range strings.Split(metadata, ":") {
+				for entry := range strings.SplitSeq(metadata, ":") {
 					if strings.HasPrefix(entry, "id=") && len(entry) > 3 {
 						active_hyperlink_id = entry[3:]
 					}
diff --git a/kittens/hyperlinked_grep/main.go b/kittens/hyperlinked_grep/main.go
index c83f77da2..38bab8a4b 100644
--- a/kittens/hyperlinked_grep/main.go
+++ b/kittens/hyperlinked_grep/main.go
@@ -47,7 +47,7 @@ func get_options_for_rg() (expecting_args map[string]bool, alias_map map[string]
 				expecting_arg := strings.Contains(s, "=")
 				single_letter_aliases := make([]string, 0, 1)
 				long_option_names := make([]string, 0, 1)
-				for _, x := range strings.Split(s, ",") {
+				for x := range strings.SplitSeq(s, ",") {
 					x = strings.TrimSpace(x)
 					if strings.HasPrefix(x, "--") {
 						lon, _, _ := strings.Cut(x[2:], "=")
@@ -136,7 +136,7 @@ func parse_args(args ...string) (delegate_to_rg bool, sanitized_args []string, k
 			if !found || k != "hyperlink" {
 				return fmt.Errorf("Unknown --kitten option: %s", val)
 			}
-			for _, x := range strings.Split(v, ",") {
+			for x := range strings.SplitSeq(v, ",") {
 				switch x {
 				case "none":
 					kitten_opts.context_lines = false
diff --git a/kittens/notify/main.go b/kittens/notify/main.go
index ff99c8918..594f09ea8 100644
--- a/kittens/notify/main.go
+++ b/kittens/notify/main.go
@@ -137,7 +137,7 @@ func (p *parsed_data) run_loop() (err error) {
 			raw := utils.UnsafeBytesToString(data[len(ESC_CODE_PREFIX[2:]):])
 			metadata, payload, _ := strings.Cut(raw, ";")
 			sent_identifier, payload_type := "", ""
-			for _, x := range strings.Split(metadata, ":") {
+			for x := range strings.SplitSeq(metadata, ":") {
 				key, val, _ := strings.Cut(x, "=")
 				switch key {
 				case "i":
diff --git a/kittens/transfer/ftc_test.go b/kittens/transfer/ftc_test.go
index 9880b4396..67f62bde1 100644
--- a/kittens/transfer/ftc_test.go
+++ b/kittens/transfer/ftc_test.go
@@ -18,11 +18,11 @@ func TestFTCSerialization(t *testing.T) {
 	q := func(expected string) {
 		actual := ftc.Serialize()
 		ad := make(map[string]bool)
-		for _, x := range strings.Split(actual, ";") {
+		for x := range strings.SplitSeq(actual, ";") {
 			ad[x] = true
 		}
 		ed := make(map[string]bool)
-		for _, x := range strings.Split(expected, ";") {
+		for x := range strings.SplitSeq(expected, ";") {
 			ed[x] = true
 		}
 		if diff := cmp.Diff(ed, ad); diff != "" {
diff --git a/kittens/transfer/send_test.go b/kittens/transfer/send_test.go
index 89969121b..0290a1c05 100644
--- a/kittens/transfer/send_test.go
+++ b/kittens/transfer/send_test.go
@@ -45,7 +45,7 @@ func TestPathMappingSend(t *testing.T) {
 			actual[f.expanded_local_path] = f.remote_path
 		}
 		e := make(map[string]string, len(actual))
-		for _, rec := range strings.Split(expected, " ") {
+		for rec := range strings.SplitSeq(expected, " ") {
 			k, v, _ := strings.Cut(rec, ":")
 			e[mp(k, false)] = mp(v, true)
 		}
diff --git a/tools/cli/completion.go b/tools/cli/completion.go
index f502c57be..f78b1aea6 100644
--- a/tools/cli/completion.go
+++ b/tools/cli/completion.go
@@ -105,7 +105,7 @@ type Delegate struct {
 
 type Completions struct {
 	Groups   []*MatchGroup `json:"groups,omitempty"`
-	Delegate Delegate      `json:"delegate,omitempty"`
+	Delegate Delegate      `json:"delegate"`
 
 	CurrentCmd             *Command `json:"-"`
 	AllWords               []string `json:"-"` // all words passed to parse_args()
diff --git a/tools/cli/files.go b/tools/cli/files.go
index cdb135ef7..72e256f2b 100644
--- a/tools/cli/files.go
+++ b/tools/cli/files.go
@@ -7,6 +7,7 @@ import (
 	"mime"
 	"os"
 	"path/filepath"
+	"slices"
 	"strings"
 
 	"golang.org/x/sys/unix"
@@ -185,13 +186,7 @@ func complete_by_fnmatch(prefix, cwd string, patterns []string) []string {
 }
 
 func complete_by_mimepat(prefix, cwd string, patterns []string) []string {
-	all_allowed := false
-	for _, p := range patterns {
-		if p == "*" {
-			all_allowed = true
-			break
-		}
-	}
+	all_allowed := slices.Contains(patterns, "*")
 	return fname_based_completer(prefix, cwd, func(name string) bool {
 		if all_allowed {
 			return true
diff --git a/tools/cli/markup/prettify.go b/tools/cli/markup/prettify.go
index c6129f5c5..a2d541396 100644
--- a/tools/cli/markup/prettify.go
+++ b/tools/cli/markup/prettify.go
@@ -19,7 +19,7 @@ var _ = fmt.Print
 type Context struct {
 	fmt_ctx style.Context
 
-	Cyan, Green, Blue, Magenta, Red, BrightRed, Yellow, Italic, Bold, Dim, Title, Exe, Opt, Emph, Err, Code func(args ...interface{}) string
+	Cyan, Green, Blue, Magenta, Red, BrightRed, Yellow, Italic, Bold, Dim, Title, Exe, Opt, Emph, Err, Code func(args ...any) string
 	Url                                                                                                     func(string, string) string
 }
 
diff --git a/tools/cmd/at/main.go b/tools/cmd/at/main.go
index f58210c49..7ee108b39 100644
--- a/tools/cmd/at/main.go
+++ b/tools/cmd/at/main.go
@@ -184,7 +184,7 @@ func (self *ResponseData) UnmarshalJSON(data []byte) error {
 
 type Response struct {
 	Ok        bool         `json:"ok"`
-	Data      ResponseData `json:"data,omitempty"`
+	Data      ResponseData `json:"data"`
 	Error     string       `json:"error,omitempty"`
 	Traceback string       `json:"tb,omitempty"`
 }
diff --git a/tools/cmd/at/send_text.go b/tools/cmd/at/send_text.go
index 12eed10e6..d86d77588 100644
--- a/tools/cmd/at/send_text.go
+++ b/tools/cmd/at/send_text.go
@@ -39,10 +39,7 @@ func parse_send_text(io_data *rc_io_data, args []string) error {
 		}
 		text := strings.Join(args, " ")
 		text_gen := func(io_data *rc_io_data) (bool, error) {
-			limit := len(text)
-			if limit > 2048 {
-				limit = 2048
-			}
+			limit := min(len(text), 2048)
 			set_payload_data(io_data, "base64:"+base64.StdEncoding.EncodeToString(utils.UnsafeStringToBytes(text[:limit])))
 			text = text[limit:]
 			return len(text) == 0, nil
diff --git a/tools/config/utils.go b/tools/config/utils.go
index f83c4cbc4..48df04ef3 100644
--- a/tools/config/utils.go
+++ b/tools/config/utils.go
@@ -18,7 +18,7 @@ var _ = fmt.Print
 
 func ParseStrDict(val, record_sep, field_sep string) (map[string]string, error) {
 	ans := make(map[string]string)
-	for _, record := range strings.Split(val, record_sep) {
+	for record := range strings.SplitSeq(val, record_sep) {
 		key, val, found := strings.Cut(record, field_sep)
 		if found {
 			ans[key] = val
diff --git a/tools/rsync/api_test.go b/tools/rsync/api_test.go
index 63bffb028..6d2a3a261 100644
--- a/tools/rsync/api_test.go
+++ b/tools/rsync/api_test.go
@@ -135,7 +135,7 @@ func generate_data(block_size, num_of_blocks int, extra ...string) []byte {
 	e := strings.Join(extra, "")
 	ans := make([]byte, num_of_blocks*block_size+len(e))
 	utils.Memset(ans, '_')
-	for i := 0; i < num_of_blocks; i++ {
+	for i := range num_of_blocks {
 		offset := i * block_size
 		copy(ans[offset:], strconv.Itoa(i))
 	}
diff --git a/tools/simdstring/benchmarks_test.go b/tools/simdstring/benchmarks_test.go
index d445d3beb..37587962b 100644
--- a/tools/simdstring/benchmarks_test.go
+++ b/tools/simdstring/benchmarks_test.go
@@ -33,7 +33,7 @@ func BenchmarkIndexByte(b *testing.B) {
 			f = bytes.IndexByte
 		}
 		b.Run(fmt.Sprintf("%s_sz=%d", which, pos), func(b *testing.B) {
-			for i := 0; i < b.N; i++ {
+			for b.Loop() {
 				f(data, 'q')
 			}
 		})
@@ -54,7 +54,7 @@ func BenchmarkIndexByte2(b *testing.B) {
 			f = index_byte2_scalar
 		}
 		b.Run(fmt.Sprintf("%s_sz=%d", which, pos), func(b *testing.B) {
-			for i := 0; i < b.N; i++ {
+			for b.Loop() {
 				f(data, 'q', 'x')
 			}
 		})
diff --git a/tools/simdstring/intrinsics_test.go b/tools/simdstring/intrinsics_test.go
index b0eedef49..23f29aec3 100644
--- a/tools/simdstring/intrinsics_test.go
+++ b/tools/simdstring/intrinsics_test.go
@@ -48,7 +48,7 @@ func test_cmpeq_epi8(a, b []byte) []byte {
 func test_cmplt_epi8(t *testing.T, a, b []byte) []byte {
 	ans := make([]byte, len(a))
 	var prev []byte
-	for which := 0; which < 3; which++ {
+	for which := range 3 {
 		if len(ans) == 16 {
 			test_cmplt_epi8_asm_128(a, b, which, ans)
 		} else {
@@ -161,7 +161,7 @@ func TestSIMDStringOps(t *testing.T) {
 	}
 	// test alignment issues
 	q := []byte("abc")
-	for sz := 0; sz < 32; sz++ {
+	for sz := range 32 {
 		test(q, '<', '>', sz)
 		test(q, ' ', 'b', sz)
 		test(q, '<', 'a', sz)
@@ -172,7 +172,7 @@ func TestSIMDStringOps(t *testing.T) {
 	tests := func(h string, a, b byte) {
 		for _, sz := range []int{0, 16, 32, 64, 79} {
 			q := strings.Repeat(" ", sz) + h
-			for sz := 0; sz < 32; sz++ {
+			for sz := range 32 {
 				test([]byte(q), a, b, sz)
 			}
 		}
@@ -326,7 +326,7 @@ func TestIntrinsics(t *testing.T) {
 		if e := test_jump_if_zero(a); e != 0 {
 			t.Fatalf("Did not detect zero register")
 		}
-		for i := 0; i < sz; i++ {
+		for i := range sz {
 			a = make([]byte, sz)
 			a[i] = 1
 			if e := test_jump_if_zero(a); e != 1 {
@@ -340,7 +340,7 @@ func TestIntrinsics(t *testing.T) {
 		if e := test_count_to_match(a, 77); e != -1 {
 			t.Fatalf("Unexpectedly found byte at: %d", e)
 		}
-		for i := 0; i < sz; i++ {
+		for i := range sz {
 			if e := test_count_to_match(a, byte(i)); e != i {
 				t.Fatalf("Failed to find the byte: %d (%d != %d)", i, i, e)
 			}
diff --git a/tools/simdstring/scalar.go b/tools/simdstring/scalar.go
index 5320aebe8..3044740ce 100644
--- a/tools/simdstring/scalar.go
+++ b/tools/simdstring/scalar.go
@@ -41,7 +41,7 @@ func index_byte2_string_scalar(data string, a, b byte) int {
 }
 
 func index_c0_scalar(data []byte) int {
-	for i := 0; i < len(data); i++ {
+	for i := range data {
 		if data[i] == 0x7f || data[i] < ' ' {
 			return i
 		}
diff --git a/tools/themes/collection.go b/tools/themes/collection.go
index 94022f2ed..6191c92e6 100644
--- a/tools/themes/collection.go
+++ b/tools/themes/collection.go
@@ -688,7 +688,7 @@ func ColorSettingsAsEscapeCodes(settings map[string]string) string {
 	set_default_color("selection_foreground", style.DefaultColors.SelectionFg, loop.SELECTION_FG)
 
 	w.WriteString("\033]4")
-	for i := 0; i < 256; i++ {
+	for i := range 256 {
 		key := "color" + strconv.Itoa(i)
 		val := settings[key]
 		if val != "" {
diff --git a/tools/tui/run.go b/tools/tui/run.go
index ff4abb4a8..223972772 100644
--- a/tools/tui/run.go
+++ b/tools/tui/run.go
@@ -137,7 +137,7 @@ func get_shell_name(argv0 string) (ans string) {
 func rc_modification_allowed(ksi string) (allowed bool, set_ksi_env_var bool) {
 	allowed = ksi != ""
 	set_ksi_env_var = true
-	for _, x := range strings.Split(ksi, " ") {
+	for x := range strings.SplitSeq(ksi, " ") {
 		switch x {
 		case "disabled":
 			allowed = false
diff --git a/tools/tui/shell_integration/api.go b/tools/tui/shell_integration/api.go
index 1927a357c..283523302 100644
--- a/tools/tui/shell_integration/api.go
+++ b/tools/tui/shell_integration/api.go
@@ -110,7 +110,7 @@ func PathToTerminfoDb(term string) (ans string) {
 		return ans
 	}
 	if td := os.Getenv("TERMINFO_DIRS"); td != "" {
-		for _, q := range strings.Split(td, string(os.PathListSeparator)) {
+		for q := range strings.SplitSeq(td, string(os.PathListSeparator)) {
 			if q == "" {
 				q = "/usr/share/terminfo"
 			}
diff --git a/tools/utils/base85/base85.go b/tools/utils/base85/base85.go
index afbe98a73..d31199ce0 100644
--- a/tools/utils/base85/base85.go
+++ b/tools/utils/base85/base85.go
@@ -45,7 +45,7 @@ var decoder_array = sync.OnceValue(func() *[256]byte {
 		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 	}
-	for i := 0; i < len(encode); i++ {
+	for i := range len(encode) {
 		decode[encode[i]] = byte(i)
 	}
 	return &decode
@@ -101,7 +101,7 @@ func decodeChunk(decode *[256]byte, dst, src []byte) (int, int) {
 	var val uint32
 	m := DecodedLen(len(src))
 	buf := [5]byte{84, 84, 84, 84, 84}
-	for i := 0; i < len(src); i++ {
+	for i := range src {
 		e := decode[src[i]]
 		if e == 0xFF {
 			return 0, i + 1
@@ -109,7 +109,7 @@ func decodeChunk(decode *[256]byte, dst, src []byte) (int, int) {
 		buf[i] = e
 	}
 
-	for i := 0; i < 5; i++ {
+	for i := range 5 {
 		r := buf[i]
 		val += uint32(r) * decode_base[i]
 	}
diff --git a/tools/utils/humanize/times.go b/tools/utils/humanize/times.go
index 04eb6085b..72b5bce70 100644
--- a/tools/utils/humanize/times.go
+++ b/tools/utils/humanize/times.go
@@ -100,7 +100,7 @@ func CustomRelTime(a, b time.Time, albl, blbl string, magnitudes []RelTimeMagnit
 		n = len(magnitudes) - 1
 	}
 	mag := magnitudes[n]
-	args := []interface{}{}
+	args := []any{}
 	escaped := false
 	for _, ch := range mag.Format {
 		if escaped {
diff --git a/tools/utils/longest-common.go b/tools/utils/longest-common.go
index 1551395b0..cbf46b862 100644
--- a/tools/utils/longest-common.go
+++ b/tools/utils/longest-common.go
@@ -58,14 +58,14 @@ func LongestCommon(next func() (string, bool), prefix bool) string {
 			return ""
 		}
 		if prefix {
-			for i := 0; i < max_len; i++ {
+			for i := range max_len {
 				if xfix[i] != q[i] {
 					xfix = xfix[:i]
 					break
 				}
 			}
 		} else {
-			for i := 0; i < max_len; i++ {
+			for i := range max_len {
 				xi := xfix_len - i - 1
 				si := q_len - i - 1
 				if xfix[xi] != q[si] {
diff --git a/tools/utils/paths.go b/tools/utils/paths.go
index 3c7e7e027..3dbced37d 100644
--- a/tools/utils/paths.go
+++ b/tools/utils/paths.go
@@ -103,7 +103,7 @@ func ConfigDirForName(name string) (config_dir string) {
 		add(xh)
 	}
 	if dirs := os.Getenv("XDG_CONFIG_DIRS"); dirs != "" {
-		for _, candidate := range strings.Split(dirs, ":") {
+		for candidate := range strings.SplitSeq(dirs, ":") {
 			add(candidate)
 		}
 	}
diff --git a/tools/utils/short-uuid.go b/tools/utils/short-uuid.go
index ebdd43b6b..c625a233e 100644
--- a/tools/utils/short-uuid.go
+++ b/tools/utils/short-uuid.go
@@ -21,10 +21,7 @@ func num_to_string(number *big.Int, alphabet []rune, alphabet_len *big.Int, pad_
 	if number.Sign() < 0 {
 		*number = zero
 	}
-	capacity := 64
-	if pad_to_length > capacity {
-		capacity = pad_to_length
-	}
+	capacity := max(pad_to_length, 64)
 	ans := make([]rune, 0, capacity)
 	for number.Cmp(&zero) == 1 {
 		number.DivMod(number, alphabet_len, &digit)
diff --git a/tools/vt/linebuf.go b/tools/vt/linebuf.go
index 73d02f1b9..3cac1dbd4 100644
--- a/tools/vt/linebuf.go
+++ b/tools/vt/linebuf.go
@@ -18,7 +18,7 @@ type LineBuf struct {
 func NewLineBuf(xnum, ynum uint) *LineBuf {
 	lm := make([]uint, ynum, ynum+extra_capacity)
 	var i uint
-	for i = 0; i < ynum; i++ {
+	for i = range ynum {
 		lm[i] = i
 	}
 	return &LineBuf{
diff --git a/tools/wcswidth/wcswidth.go b/tools/wcswidth/wcswidth.go
index 02ea80a32..332ac08f6 100644
--- a/tools/wcswidth/wcswidth.go
+++ b/tools/wcswidth/wcswidth.go
@@ -49,7 +49,7 @@ func (self *WCWidthIterator) handle_csi(csi []byte) error {
 		num_string := utils.UnsafeBytesToString(csi[:len(csi)-1])
 		n, err := strconv.Atoi(num_string)
 		if err == nil && n > 0 {
-			for i := 0; i < n; i++ {
+			for range n {
 				err = self.handle_rune(self.prev_ch)
 				if err != nil {
 					return err