Test (and fix some) invalid assignments.

tests/language/final_super_field_set_test.dart

Index: tests/language/final_super_field_set_test.dart
diff --git a/tests/language/regress_21998_1_test.dart b/tests/language/final_super_field_set_test.dart
similarity index 60%
copy from tests/language/regress_21998_1_test.dart
copy to tests/language/final_super_field_set_test.dart
index 3237f3396629f6fd11270e1adc290bec78713958..9c3289bb1f94059cdc49e5330bfad14bb4f58d3f 100644
--- a/tests/language/regress_21998_1_test.dart
+++ b/tests/language/final_super_field_set_test.dart
@@ -2,17 +2,19 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:math' as Math;
 import 'package:expect/expect.dart';
 
-main() {
-  Expect.equals(4, new C().m());
+class SuperClass {
+  final field = 0;
+  noSuchMethod(_) => 42;
 }
 
-class C {
-  max(a) => a;
-
+class Class extends SuperClass {
   m() {
-    return max(Math.max(2, 4));
+    super.field = 87; /// 01: static type warning
   }
+}
+
+main() {
+  new Class().m(); /// 01: continued
 }