Fix warnings_checker.dart handling of multitests

tests/language_strong/malformed_inheritance_test.dart

 // Copyright (c) 2013, 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.
 
 // Tests that malformed types used in extends, implements, and with clauses
 // cause compile-time errors.
 
 import 'package:expect/expect.dart';
 
 class A<T> {}
 
 class C
-  extends Unresolved /// 01: compile-time error
-  extends A<Unresolved> /// 02: static type warning
-  extends Object with Unresolved /// 03: compile-time error
-  extends Object with A<Unresolved> /// 04: static type warning
-  implements Unresolved /// 05: compile-time error
-  implements A<Unresolved> /// 06: static type warning
-  <A> extends A<int> /// 07: compile-time error
-  <A> extends A<Unresolved> /// 08: compile-time error
-  <A> extends Object with A<int> /// 09: compile-time error
-  <A> extends Object with A<Unresolved> /// 10: compile-time error
-  <A> implements A<int> /// 11: compile-time error
-  <A> implements A<Unresolved> /// 12: compile-time error
+  extends Unresolved //# 01: compile-time error
+  extends A<Unresolved> //# 02: static type warning
+  extends Object with Unresolved //# 03: compile-time error
+  extends Object with A<Unresolved> //# 04: static type warning
+  implements Unresolved //# 05: compile-time error
+  implements A<Unresolved> //# 06: static type warning
+  <A> extends A<int> //# 07: compile-time error
+  <A> extends A<Unresolved> //# 08: compile-time error
+  <A> extends Object with A<int> //# 09: compile-time error
+  <A> extends Object with A<Unresolved> //# 10: compile-time error
+  <A> implements A<int> //# 11: compile-time error
+  <A> implements A<Unresolved> //# 12: compile-time error
 {
 
 }
 
 void main() {
   new C();
-  Expect.isTrue(new C() is A<String> && new C() is A<int>); /// 02: continued
-  Expect.isTrue(new C() is A<String> && new C() is A<int>); /// 04: continued
-  Expect.isTrue(new C() is A<String> && new C() is A<int>); /// 06: continued
+  Expect.isTrue(new C() is A<String> && new C() is A<int>); //# 02: continued
+  Expect.isTrue(new C() is A<String> && new C() is A<int>); //# 04: continued
+  Expect.isTrue(new C() is A<String> && new C() is A<int>); //# 06: continued
 }