Report compile-time error when extending, mixing in or implementing a malformed type.

tests/language/mixin_invalid_inheritance1_test.dart

Index: tests/language/mixin_invalid_inheritance1_test.dart
diff --git a/pkg/analyzer_experimental/lib/formatter.dart b/tests/language/mixin_invalid_inheritance1_test.dart
similarity index 55%
copy from pkg/analyzer_experimental/lib/formatter.dart
copy to tests/language/mixin_invalid_inheritance1_test.dart
index f98d2666a21a69cd2e2db427b91f2e61dabfc14f..98b476b3c7367f66443d82f3746714701f376068 100644
--- a/pkg/analyzer_experimental/lib/formatter.dart
+++ b/tests/language/mixin_invalid_inheritance1_test.dart
@@ -2,7 +2,10 @@
 // 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.
 
-library formatter;
+class C<T> extends Object
+  with Malformed  /// 01: compile-time error
+  with T  /// 02: compile-time error
+  with T<int>  /// 03: compile-time error
+{}
 
-export 'package:analyzer_experimental/src/services/formatter_impl.dart'
-  show CodeFormatter, FormatterOptions, FormattedSource, CodeKind;
+main() => new C<C>();