Fix warnings_checker.dart handling of multitests

tests/language_strong/call_constructor_on_unresolvable_class_test.dart

 // Copyright (c) 2012, 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.
 
 // Check that calling a constructor of a class that cannot be resolved causes
 // a runtime error.
 
 import "package:expect/expect.dart";
 import 'dart:math';
 
 never() {
   Random r = new Random();
   int r1 = r.nextInt(1000);
   int r2 = r.nextInt(1000);
   int r3 = r.nextInt(1000);
   return (r1 > r3) && (r2 > r3) && (r3 > r1 + r2);
 }
 
 main() {
   if (never()) {
     // These should not produce errors because the calls are never executed.
-    new A(); //        /// 01: static type warning
-    new A.foo(); //    /// 02: static type warning
-    new lib.A(); //    /// 03: static type warning
+    new A(); //        //# 01: static type warning
+    new A.foo(); //    //# 02: static type warning
+    new lib.A(); //    //# 03: static type warning
   }
 
-  new A(); //        /// 04: static type warning, runtime error
-  new A.foo(); //    /// 05: static type warning, runtime error
-  new lib.A(); //    /// 06: static type warning, runtime error
+  new A(); //        //# 04: static type warning, runtime error
+  new A.foo(); //    //# 05: static type warning, runtime error
+  new lib.A(); //    //# 06: static type warning, runtime error
 
-  var ex; //                   /// 07: static type warning
-  try { //                     /// 07: continued
-    new A(); //                /// 07: continued
-  } catch (e) { //             /// 07: continued
-    ex = e; //                 /// 07: continued
-  } //                         /// 07: continued
-  Expect.isTrue(ex != null); /// 07: continued
+  var ex; //                   //# 07: static type warning
+  try { //                     //# 07: continued
+    new A(); //                //# 07: continued
+  } catch (e) { //             //# 07: continued
+    ex = e; //                 //# 07: continued
+  } //                         //# 07: continued
+  Expect.isTrue(ex != null); //# 07: continued
 }