Fix warnings_checker.dart handling of multitests

tests/language/reify_typevar_static_test.dart

Index: tests/language/reify_typevar_static_test.dart
diff --git a/tests/language/reify_typevar_static_test.dart b/tests/language/reify_typevar_static_test.dart
index fb9bf9acb3a1dc8c750cfd18cef18784e5377d1e..8c547a44f36acc835421a838b543945e47d826e3 100644
--- a/tests/language/reify_typevar_static_test.dart
+++ b/tests/language/reify_typevar_static_test.dart
@@ -9,16 +9,16 @@ class C<T> {
   C([this.x]);
 
   static staticFunction(bool b) =>
-    b ? T : //                               /// 00: compile-time error
+    b ? T : //                               //# 00: compile-time error
     null;
   factory C.factoryConstructor(bool b) => new C(
-    b ? T : //                               /// 01: ok
+    b ? T : //                               //# 01: ok
     null);
   C.redirectingConstructor(bool b) : this(
-    b ? T : //                               /// 02: ok
+    b ? T : //                               //# 02: ok
     null);
   C.ordinaryConstructor(bool b) : x =
-    b ? T : //                               /// 03: ok
+    b ? T : //                               //# 03: ok
     null;
 }