diff -r dd479b99dcd3 src/pkg/io/ioutil/ioutil.go
--- a/src/pkg/io/ioutil/ioutil.go	Wed Jul 20 08:39:24 2011 +1000
+++ b/src/pkg/io/ioutil/ioutil.go	Tue Jul 19 17:57:14 2011 -0700
@@ -108,6 +108,23 @@
 	return len(p), nil
 }
 
+var blackHole = make([]byte, 8192)
+
+func (devNull) ReadFrom(r io.Reader) (n int64, err os.Error) {
+	readSize := 0
+	for ;; {
+		junk := blackHole[0:cap(blackHole)]
+		readSize, err = r.Read(junk)
+		n += int64(readSize)
+		if err != nil && err != os.EOF {
+			return n, err
+		} else {
+			return n, nil
+		}
+	}
+	return n, nil // err is EOF, so return nil explicitly
+}
+
 // Discard is an io.Writer on which all Write calls succeed
 // without doing anything.
 var Discard io.Writer = devNull(0)