diff --git a/ch11/storage2/storage.go b/ch11/storage2/storage.go
index f103fbb..20275da 100644
--- a/ch11/storage2/storage.go
+++ b/ch11/storage2/storage.go
@@ -31,7 +31,7 @@ var notifyUser = func(username, msg string) {
 	err := smtp.SendMail(hostname+":587", auth, sender,
 		[]string{username}, []byte(msg))
 	if err != nil {
-		log.Printf("smtp.SendEmail(%s) failed: %s", username, err)
+		log.Printf("smtp.SendMail(%s) failed: %s", username, err)
 	}
 }
 
diff --git a/ch13/equal/equal_test.go b/ch13/equal/equal_test.go
index 4656077..500b85f 100644
--- a/ch13/equal/equal_test.go
+++ b/ch13/equal/equal_test.go
@@ -18,8 +18,8 @@ func TestEqual(t *testing.T) {
 	cyclePtr2 = &cyclePtr2
 
 	type CycleSlice []CycleSlice
-	var cycleSlice CycleSlice
-	cycleSlice = append(cycleSlice, cycleSlice)
+	var cycleSlice = make(CycleSlice, 1)
+	cycleSlice[0] = cycleSlice
 
 	ch1, ch2 := make(chan int), make(chan int)
 	var ch1ro <-chan int = ch1
diff --git a/ch7/eval/parse.go b/ch7/eval/parse.go
index 677e9a0..e68f8f5 100644
--- a/ch7/eval/parse.go
+++ b/ch7/eval/parse.go
@@ -146,7 +146,7 @@ func parsePrimary(lex *lexer) Expr {
 		return literal(f)
 
 	case '(':
-		lex.next() // consume ')'
+		lex.next() // consume '('
 		e := parseExpr(lex)
 		if lex.token != ')' {
 			msg := fmt.Sprintf("got %s, want ')'", lex.describe())