workaround for compiler bug: len(a) is zero

TBR=iant
OCL=13873
CL=13873

test/chan/powser1.go

@@ -624,8 +624,9 @@ func check(U PS, c *rat, count int, str string) {
 	}
 }
 
+const N=10
 func checka(U PS, a *[]*rat, str string) {
-	for i := 0; i < len(a); i++ {
+	for i := 0; i < N; i++ {
 		check(U, a[i], 1, str);
 	}
 }
@@ -648,8 +649,7 @@ func main() {
 		check(Ones, one, 5, "Ones");
 		check(Add(Ones, Ones), itor(2), 0, "Add Ones Ones");  // 1 1 1 1 1
 		check(Add(Ones, Twos), itor(3), 0, "Add Ones Twos"); // 3 3 3 3 3
-		const N = 5;
-		a := new([10] *rat);
+		a := new([N] *rat);
 		d := Diff(Ones);
 		// BUG: want array initializer
 		for i:=0; i < N; i++ {