diff --git a/blocks.go b/blocks.go
index 7f2c9081..b0f84cd9 100644
--- a/blocks.go
+++ b/blocks.go
@@ -17,7 +17,7 @@ func Blocks(r io.Reader, blocksize int) ([]Block, error) {
 	var blocks []Block
 	var offset int64
 	for {
-		lr := &io.LimitedReader{r, int64(blocksize)}
+		lr := &io.LimitedReader{R: r, N: int64(blocksize)}
 		hf := sha256.New()
 		n, err := io.Copy(hf, lr)
 		if err != nil {
diff --git a/discover/discover.go b/discover/discover.go
index bdc8fd84..e4902c85 100644
--- a/discover/discover.go
+++ b/discover/discover.go
@@ -134,7 +134,7 @@ func (d *Discoverer) sendExtAnnouncements() {
 		}
 		time.Sleep(d.ExtBroadcastIntv)
 	}
-	log.Println("discover/write: %v: stopping due to too many errors:", remote, err)
+	log.Printf("discover/write: %v: stopping due to too many errors: %v", remote, err)
 }
 
 func (d *Discoverer) recvAnnouncements() {
diff --git a/filequeue_test.go b/filequeue_test.go
index 289c69a9..bf0add74 100644
--- a/filequeue_test.go
+++ b/filequeue_test.go
@@ -272,7 +272,7 @@ func TestFileQueueThreadHandling(t *testing.T) {
 	close(start)
 	wg.Wait()
 	if int(gotTot) != total {
-		t.Error("Total mismatch; %d != %d", gotTot, total)
+		t.Errorf("Total mismatch; %d != %d", gotTot, total)
 	}
 }
 
@@ -283,13 +283,13 @@ func TestDeleteAt(t *testing.T) {
 		q.files = queuedFileList{{name: "a"}, {name: "b"}, {name: "c"}, {name: "d"}}
 		q.deleteAt(i)
 		if l := len(q.files); l != 3 {
-			t.Fatal("deleteAt(%d) failed; %d != 3", i, l)
+			t.Fatalf("deleteAt(%d) failed; %d != 3", i, l)
 		}
 	}
 
 	q.files = queuedFileList{{name: "a"}}
 	q.deleteAt(0)
 	if l := len(q.files); l != 0 {
-		t.Fatal("deleteAt(only) failed; %d != 0", l)
+		t.Fatalf("deleteAt(only) failed; %d != 0", l)
 	}
 }
diff --git a/main.go b/main.go
index 96c6c8f1..320374ab 100644
--- a/main.go
+++ b/main.go
@@ -502,7 +502,10 @@ func saveIndex(m *Model) {
 
 	gzw := gzip.NewWriter(idxf)
 
-	protocol.IndexMessage{"local", m.ProtocolIndex()}.EncodeXDR(gzw)
+	protocol.IndexMessage{
+		Repository: "local",
+		Files:      m.ProtocolIndex(),
+	}.EncodeXDR(gzw)
 	gzw.Close()
 	idxf.Close()
 	os.Rename(fullName+".tmp", fullName)
diff --git a/protocol/protocol.go b/protocol/protocol.go
index 9fca8f88..2e9920e7 100644
--- a/protocol/protocol.go
+++ b/protocol/protocol.go
@@ -268,7 +268,7 @@ loop:
 			break loop
 		}
 		if hdr.version != 0 {
-			c.close(fmt.Errorf("Protocol error: %s: unknown message version %#x", c.ID, hdr.version))
+			c.close(fmt.Errorf("Protocol error: %s: unknown message version %#x", c.id, hdr.version))
 			break loop
 		}
 
@@ -371,7 +371,7 @@ loop:
 			}
 
 		default:
-			c.close(fmt.Errorf("Protocol error: %s: unknown message type %#x", c.ID, hdr.msgType))
+			c.close(fmt.Errorf("Protocol error: %s: unknown message type %#x", c.id, hdr.msgType))
 			break loop
 		}
 	}
diff --git a/protocol/protocol_test.go b/protocol/protocol_test.go
index f15a6773..c7abb439 100644
--- a/protocol/protocol_test.go
+++ b/protocol/protocol_test.go
@@ -99,16 +99,16 @@ func TestRequestResponseErr(t *testing.T) {
 				t.Errorf("Incorrect response data %q", string(d))
 			}
 			if m0.repo != "default" {
-				t.Error("Incorrect repo %q", m0.repo)
+				t.Errorf("Incorrect repo %q", m0.repo)
 			}
 			if m0.name != "tn" {
-				t.Error("Incorrect name %q", m0.name)
+				t.Errorf("Incorrect name %q", m0.name)
 			}
 			if m0.offset != 1234 {
-				t.Error("Incorrect offset %d", m0.offset)
+				t.Errorf("Incorrect offset %d", m0.offset)
 			}
 			if m0.size != 5678 {
-				t.Error("Incorrect size %d", m0.size)
+				t.Errorf("Incorrect size %d", m0.size)
 			}
 			t.Logf("Pass at %d+%d bytes", i, j)
 			pass = true
diff --git a/suppressor_test.go b/suppressor_test.go
index 26cc5e3b..87eec216 100644
--- a/suppressor_test.go
+++ b/suppressor_test.go
@@ -21,7 +21,7 @@ func TestSuppressor(t *testing.T) {
 	// bw is 10000 / 10 = 1000
 	t1 = t0.Add(10 * time.Second)
 	if bw := s.changes["foo"].bandwidth(t1); bw != 1000 {
-		t.Error("Incorrect bw %d", bw)
+		t.Errorf("Incorrect bw %d", bw)
 	}
 	sup, prev = s.suppress("foo", 10000, t1)
 	if sup {
@@ -34,7 +34,7 @@ func TestSuppressor(t *testing.T) {
 	// bw is (10000 + 10000) / 11 = 1818
 	t1 = t0.Add(11 * time.Second)
 	if bw := s.changes["foo"].bandwidth(t1); bw != 1818 {
-		t.Error("Incorrect bw %d", bw)
+		t.Errorf("Incorrect bw %d", bw)
 	}
 	sup, prev = s.suppress("foo", 100500, t1)
 	if sup {
@@ -47,7 +47,7 @@ func TestSuppressor(t *testing.T) {
 	// bw is (10000 + 10000 + 100500) / 12 = 10041
 	t1 = t0.Add(12 * time.Second)
 	if bw := s.changes["foo"].bandwidth(t1); bw != 10041 {
-		t.Error("Incorrect bw %d", bw)
+		t.Errorf("Incorrect bw %d", bw)
 	}
 	sup, prev = s.suppress("foo", 10000000, t1) // value will be ignored
 	if !sup {
@@ -60,7 +60,7 @@ func TestSuppressor(t *testing.T) {
 	// bw is (10000 + 10000 + 100500) / 15 = 8033
 	t1 = t0.Add(15 * time.Second)
 	if bw := s.changes["foo"].bandwidth(t1); bw != 8033 {
-		t.Error("Incorrect bw %d", bw)
+		t.Errorf("Incorrect bw %d", bw)
 	}
 	sup, prev = s.suppress("foo", 10000000, t1)
 	if sup {