Fix warnings_checker.dart handling of multitests

tests/language/list_literal_syntax_test.dart

Index: tests/language/list_literal_syntax_test.dart
diff --git a/tests/language/list_literal_syntax_test.dart b/tests/language/list_literal_syntax_test.dart
index c9c332041899edbdb76cd3cfb636cb92838d068d..c1a2060a00c56c1d79010663faeb19c10110cd3b 100644
--- a/tests/language/list_literal_syntax_test.dart
+++ b/tests/language/list_literal_syntax_test.dart
@@ -9,41 +9,41 @@ abstract class I {}
 void main() {
   var list;
   list = <int
-    I /// 00: compile-time error
-    , int /// 01: static type warning
+    I //# 00: compile-time error
+    , int //# 01: static type warning
     >[0];
   Expect.equals(1, list.length);
 
   list = <int
-    , int /// 02: static type warning
-    , int /// 02: continued
+    , int //# 02: static type warning
+    , int //# 02: continued
     >[0];
   Expect.equals(1, list.length);
 
   list = <int
-    , int /// 03: static type warning
-    , int /// 03: continued
-    , int /// 03: continued
+    , int //# 03: static type warning
+    , int //# 03: continued
+    , int //# 03: continued
     >[0];
   Expect.equals(1, list.length);
 
   list =
-    <> /// 04: compile-time error
+    <> //# 04: compile-time error
     [0];
   Expect.equals(1, list.length);
 
   list =
-    <<>> /// 05: compile-time error
+    <<>> //# 05: compile-time error
     [0];
   Expect.equals(1, list.length);
 
   list =
-    <<<>>> /// 06: compile-time error
+    <<<>>> //# 06: compile-time error
     [0];
   Expect.equals(1, list.length);
 
   list =
-    <[]> /// 07: compile-time error
+    <[]> //# 07: compile-time error
     [0];
   Expect.equals(1, list.length);