small fixes

Makefile

@@ -25,4 +25,4 @@ bench: $(sources)
 
 clean:
 	go clean
-	rm .cover
+	rm -f .cover

content.go

@@ -2,6 +2,7 @@ package buffer
 
 import (
 	"errors"
+	"fmt"
 	"io"
 )
 
@@ -56,6 +57,17 @@ func (c *content) writeTo() {
 		r: c.w,
 	}
 
+	defer func() {
+		r := recover()
+		if r == nil {
+			return
+		}
+
+		err := fmt.Errorf("panic provided WriterTo: %v", r)
+		w.w <- syncMessage{err: err}
+		close(w.w)
+	}()
+
 	var sm syncMessage
 	_, err := c.wrt.WriteTo(w)
 	if err != nil {

pool.go

@@ -1,6 +1,9 @@
 package buffer
 
-import "sync"
+import (
+	"errors"
+	"sync"
+)
 
 type noPool struct {
 	allocSize int
@@ -28,7 +31,12 @@ func (noPool) Put([]byte) {
 }
 
 func (p *pool) Get() ([]byte, error) {
-	return p.sp.Get().([]byte), nil
+	b, ok := p.sp.Get().([]byte)
+	if !ok {
+		return nil, errors.New("invalid resource received from pool")
+	}
+
+	return b, nil
 }
 
 func (p *pool) Put(b []byte) {

reader.go

@@ -410,17 +410,17 @@ func (r *reader) readUTF8(max int) ([]rune, int, error) {
 			break
 		}
 
-		r, s := utf8.DecodeRune(b)
-		if r == utf8.RuneError && s == 1 && len(runes) == 0 {
+		rn, s := utf8.DecodeRune(b)
+		if rn == utf8.RuneError && s == 1 && len(runes) == 0 {
 			n = 1
 			break
 		}
 
-		if r == utf8.RuneError && s == 1 {
+		if rn == utf8.RuneError && s == 1 {
 			break
 		}
 
-		runes = append(runes, r)
+		runes = append(runes, rn)
 		n += s
 	}