Using 'interface' and 'abstract' for methods should produce error

compiler/javatests/com/google/dart/compiler/parser/TryCatch.dart

Index: compiler/javatests/com/google/dart/compiler/parser/TryCatch.dart
diff --git a/compiler/javatests/com/google/dart/compiler/parser/TryCatch.dart b/compiler/javatests/com/google/dart/compiler/parser/TryCatch.dart
index ea95022f82a006393baf086e5e402eba17e7059e..47087330ab3f7421f483ad7bcd4141dd38b3174b 100644
--- a/compiler/javatests/com/google/dart/compiler/parser/TryCatch.dart
+++ b/compiler/javatests/com/google/dart/compiler/parser/TryCatch.dart
@@ -2,11 +2,11 @@
 // 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.
 
-interface TestException1 {
+abstract class TestException1 {
   int foo();
 }
 
-interface TestException2 {
+abstract class TestException2 {
   int bar();
 }