Fix warnings_checker.dart handling of multitests

tests/corelib/from_environment_const_type_test.dart

Index: tests/corelib/from_environment_const_type_test.dart
diff --git a/tests/corelib/from_environment_const_type_test.dart b/tests/corelib/from_environment_const_type_test.dart
index e68ac4f390088589325f7179e1ed9298353ad263..fb9de9816a13833f353def2185e5f7a73c2d16a1 100644
--- a/tests/corelib/from_environment_const_type_test.dart
+++ b/tests/corelib/from_environment_const_type_test.dart
@@ -8,31 +8,31 @@ import "package:expect/expect.dart";
 class Foo {}
 
 const
-    bool //   /// 01: ok
-    int //    /// 02: static type warning, checked mode compile-time error
-    String // /// 03: static type warning, checked mode compile-time error
-    Foo //    /// 04: static type warning, checked mode compile-time error
+    bool //   //# 01: ok
+    int //    //# 02: static type warning, checked mode compile-time error
+    String // //# 03: static type warning, checked mode compile-time error
+    Foo //    //# 04: static type warning, checked mode compile-time error
     a = const bool.fromEnvironment('a');
 
 const
-    bool //   /// 05: ok
-    int //    /// 06: static type warning, checked mode compile-time error
-    String // /// 07: static type warning, checked mode compile-time error
-    Foo //    /// 08: static type warning, checked mode compile-time error
+    bool //   //# 05: ok
+    int //    //# 06: static type warning, checked mode compile-time error
+    String // //# 07: static type warning, checked mode compile-time error
+    Foo //    //# 08: static type warning, checked mode compile-time error
     b = const bool.fromEnvironment('b');
 
 const
-    bool //   /// 09: static type warning, checked mode compile-time error
-    int //    /// 10: ok
-    String // /// 11: static type warning, checked mode compile-time error
-    Foo //    /// 12: static type warning, checked mode compile-time error
+    bool //   //# 09: static type warning, checked mode compile-time error
+    int //    //# 10: ok
+    String // //# 11: static type warning, checked mode compile-time error
+    Foo //    //# 12: static type warning, checked mode compile-time error
     c = const int.fromEnvironment('c');
 
 const
-    bool //   /// 13: static type warning, checked mode compile-time error
-    int //    /// 14: static type warning, checked mode compile-time error
-    String // /// 15: ok
-    Foo //    /// 16: static type warning, checked mode compile-time error
+    bool //   //# 13: static type warning, checked mode compile-time error
+    int //    //# 14: static type warning, checked mode compile-time error
+    String // //# 15: ok
+    Foo //    //# 16: static type warning, checked mode compile-time error
     d = const String.fromEnvironment('d');
 
 main() {