Fix warnings_checker.dart handling of multitests

tests/language/abstract_runtime_error_test.dart

Index: tests/language/abstract_runtime_error_test.dart
diff --git a/tests/language/abstract_runtime_error_test.dart b/tests/language/abstract_runtime_error_test.dart
index 97f71ef6af5ffac451c3757f1f37d0412766c54e..556f9ffeb4ac680551088f8bb94c4fa3ec5c390e 100644
--- a/tests/language/abstract_runtime_error_test.dart
+++ b/tests/language/abstract_runtime_error_test.dart
@@ -12,7 +12,7 @@ import "package:expect/expect.dart";
 
 
 abstract class Interface {
-  void foo(); /// 03: static type warning
+  void foo(); //# 03: static type warning
 }
 
 abstract class AbstractClass {
@@ -27,19 +27,19 @@ class NonAbstractClass implements Interface {
   toString() => 'NonAbstractClass';
 }
 
-Interface interface() => new Interface(); /// 01: static type warning
+Interface interface() => new Interface(); //# 01: static type warning
 
-AbstractClass abstractClass() => new AbstractClass(); /// 02: static type warning
+AbstractClass abstractClass() => new AbstractClass(); //# 02: static type warning
 
 bool isAbstractClassInstantiationError(e) {
   return e is AbstractClassInstantiationError;
 }
 
 void main() {
-  Expect.throws(interface, isAbstractClassInstantiationError, //     /// 01: continued
-                "expected AbstractClassInstantiationError"); //      /// 01: continued
-  Expect.throws(abstractClass, isAbstractClassInstantiationError, // /// 02: continued
-                "expected AbstractClassInstantiationError"); //      /// 02: continued
+  Expect.throws(interface, isAbstractClassInstantiationError, //     //# 01: continued
+                "expected AbstractClassInstantiationError"); //      //# 01: continued
+  Expect.throws(abstractClass, isAbstractClassInstantiationError, // //# 02: continued
+                "expected AbstractClassInstantiationError"); //      //# 02: continued
   Expect.stringEquals('ConcreteSubclass', '${new ConcreteSubclass()}');
   Expect.stringEquals('NonAbstractClass', '${new NonAbstractClass()}');
 }