Fix warnings_checker.dart handling of multitests

tests/language/compile_time_constant10_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.
 
 import "package:expect/expect.dart";
 
 // Test that 'identical(a,b)' is a compile-time constant.
 
 class C {
   final x;
@@ skipping 68 matching lines @@
   const CT(s1, l1),
   const CT(l1, m1),
   const CT(m1, c1),
   const CT(c1, f1),
   const CT(f1, C.f3),
   const CT(C.f3, identical),
   const CT(identical, i1),
 ];
 
 // Not a constant if it's not written 'identical'.
-const idtest = id(i1, i2); // /// 01: compile-time error
+const idtest = id(i1, i2); // //# 01: compile-time error
 
 // Not a constant if aliased? (Current interpretation, waiting for
 // confirmation).
-class T { //                                    /// 02: compile-time error
-  static const identical = id; //               /// 02: continued
-  static const idtest2 = identical(i1, i2); //  /// 02: continued
-} //                                            /// 02: continued
+class T { //                                    //# 02: compile-time error
+  static const identical = id; //               //# 02: continued
+  static const idtest2 = identical(i1, i2); //  //# 02: continued
+} //                                            //# 02: continued
 
 main() {
   for (int i = 0; i < trueTests.length; i++) {
     trueTests[i].test(Expect.isTrue, "true[$i]");
   }
   for (int i = 0; i < falseTests.length; i++) {
     falseTests[i].test(Expect.isFalse, "false[$i]");
   }
 
-  var x = idtest; // /// 01: continued
-  var x = T.idtest2; // /// 02: continued
+  var x = idtest; // //# 01: continued
+  var x = T.idtest2; // //# 02: continued
 }