Changes to compile compound constructor types

tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 // Helper to test compilation equivalence between source and .dill based
 // compilation.
 library dart2js.kernel.compile_from_dill_test_helper;
 
 import 'dart:async';
 import 'dart:io';
@@ skipping 139 matching lines @@
   do {
     if (i == 5) continue;
     x = i;
     if (i == 7) break;
     i++;
   } while (i < 10);
   print(x);
 } 
 '''
   }, expectIdenticalOutput: false),
+  const Test(const {
+    'main.dart': '''
+class A<U,V> {
+  var a = U;
+  var b = V;
+}
+class B<Q, R> extends A<R, W<Q>> {
+}
+class C<Y> extends B<Y, W<Y>> {
+}
+class W<Z> {}
+main() {
+  print(new C<String>().a);
+}
+'''
+  }, expectIdenticalOutput: true),
 ];
 
 enum ResultKind { crashes, errors, warnings, success, failure }
 
 const List<String> commonOptions = const <String>[
   Flags.disableTypeInference,
   Flags.disableInlining,
   Flags.enableAssertMessage
 ];
 
@@ skipping 149 matching lines @@
       Map<String, BufferedOutputSink> map2 = collector2.outputMap[outputType];
       checkSets(map1.keys, map2.keys, 'output', equality);
       map1.forEach((String name, BufferedOutputSink output1) {
         BufferedOutputSink output2 = map2[name];
         Expect.stringEquals(output1.text, output2.text);
       });
     });
   }
   return ResultKind.success;
 }