1 files changed, 18 insertions, 0 deletions
diff --git a/libgo/go/testing/quick/quick_test.go b/libgo/go/testing/quick/quick_test.go
index fe443592f87..4246cd1d3ba 100644
--- a/libgo/go/testing/quick/quick_test.go
+++ b/libgo/go/testing/quick/quick_test.go
@@ -307,3 +307,21 @@ func TestNonZeroSliceAndMap(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+func TestInt64(t *testing.T) {
+	var lo, hi int64
+	f := func(x int64) bool {
+		if x < lo {
+			lo = x
+		}
+		if x > hi {
+			hi = x
+		}
+		return true
+	}
+	cfg := &Config{MaxCount: 100000}
+	Check(f, cfg)
+	if uint64(lo)>>62 == 0 || uint64(hi)>>62 == 0 {
+		t.Errorf("int64 returned range %#016x,%#016x; does not look like full range", lo, hi)
+	}
+}