code review 5713049: reflect: make Value.Interface return immutable data

src/pkg/reflect/all_test.go

Index: src/pkg/reflect/all_test.go
===================================================================
--- a/src/pkg/reflect/all_test.go
+++ b/src/pkg/reflect/all_test.go
@@ -1743,3 +1743,15 @@
 		panic("zero Value")
 	}
 }
+
+func TestAlias(t *testing.T) {
+	x := string("hello")
+	v := ValueOf(&x).Elem()
+	oldvalue := v.Interface()
+	v.SetString("world")
+	newvalue := v.Interface()
+
+	if oldvalue != "hello" || newvalue != "world" {
+		t.Errorf("aliasing: old=%q new=%q, want hello, world", oldvalue, newvalue)
+	}
+}