Fix warnings_checker.dart handling of multitests

tests/language/type_variable_conflict_test.dart

Index: tests/language/type_variable_conflict_test.dart
diff --git a/tests/language/type_variable_conflict_test.dart b/tests/language/type_variable_conflict_test.dart
index 1453f4292e91be093cda2f5fa803201e99bb7058..8cb3cb14ee00143476b7058d6b30e4186060e590 100644
--- a/tests/language/type_variable_conflict_test.dart
+++ b/tests/language/type_variable_conflict_test.dart
@@ -8,22 +8,22 @@
 import "package:expect/expect.dart";
 
 class G1<T> {
-  var T; // /// 01: compile-time error
+  var T; // //# 01: compile-time error
 }
 class G2<T> {
-  get T {} // /// 02: compile-time error
+  get T {} // //# 02: compile-time error
 }
 class G3<T> {
-  T() {} // /// 03: compile-time error
+  T() {} // //# 03: compile-time error
 }
 class G4<T> {
-  static var T; // /// 04: compile-time error
+  static var T; // //# 04: compile-time error
 }
 class G5<T> {
-  static get T {} // /// 05: compile-time error
+  static get T {} // //# 05: compile-time error
 }
 class G6<T> {
-  static T() {} // /// 06: compile-time error
+  static T() {} // //# 06: compile-time error
 }
 
 main() {