diff --git a/codec/codecutil/lex.go b/codec/codecutil/lex.go
index 3e1d862d..98953a93 100644
--- a/codec/codecutil/lex.go
+++ b/codec/codecutil/lex.go
@@ -52,6 +52,8 @@ func (l *ByteLexer) Lex(dst io.Writer, src io.Reader, t time.Duration) error {
 	if t < 0 {
 		return fmt.Errorf("invalid delay: %v", t)
 	}
+
+	// Set up delay, make loop instant if t is 0.
 	var ticker *time.Ticker
 	var zeroTicks chan time.Time
 	if t > 0 {
@@ -76,28 +78,3 @@ func (l *ByteLexer) Lex(dst io.Writer, src io.Reader, t time.Duration) error {
 		}
 	}
 }
-
-func main() {
-	for _, delay := range []time.Duration{0, 10 * time.Millisecond} {
-		t := newTicker(delay)
-		for i := 0; i < 10; i++ {
-			<-t.C
-			fmt.Println(time.Now(), i)
-		}
-		fmt.Println()
-	}
-}
-
-var zeroTicks chan time.Time
-
-func init() {
-	zeroTicks = make(chan time.Time)
-	close(zeroTicks)
-}
-
-func newTicker(d time.Duration) *time.Ticker {
-	if d == 0 {
-		return &time.Ticker{C: zeroTicks}
-	}
-	return time.NewTicker(d)
-}