Avoid crashing on function syntax.

pkg/front_end/test/fasta/type_variable_as_super.dart

Index: pkg/front_end/test/fasta/type_variable_as_super.dart
diff --git a/pkg/front_end/test/fasta/type_variable_as_super.dart b/pkg/front_end/test/fasta/type_variable_as_super.dart
index a9cb1e7e4d343a28e8026a87886b8fb3cc742683..dbcfaaa636f7079a94d856f166524ef3028c0877 100644
--- a/pkg/front_end/test/fasta/type_variable_as_super.dart
+++ b/pkg/front_end/test/fasta/type_variable_as_super.dart
@@ -2,15 +2,13 @@
 // 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.
 
-abstract class A<T> extends T {
-}
+abstract class A<T> extends T {}
 
 abstract class B<T> extends T {
   B();
 }
 
-class C<T> extends T {
-}
+class C<T> extends T {}
 
 main() {
   new A();