diff -r 48658f7ed377 libgo/go/json/scanner_test.go
--- a/libgo/go/json/scanner_test.go	Fri Jun 24 07:06:48 2011 -0700
+++ b/libgo/go/json/scanner_test.go	Wed Jul 06 11:35:51 2011 -0700
@@ -252,6 +252,9 @@
 	if f > n {
 		f = n
 	}
+	if n > 0 && f == 0 {
+		f = 1
+	}
 	x := make([]interface{}, int(f))
 	for i := range x {
 		x[i] = genValue(((i+1)*n)/f - (i*n)/f)