Fix warnings_checker.dart handling of multitests

tests/language/compile_time_constant_o_test.dart

Index: tests/language/compile_time_constant_o_test.dart
diff --git a/tests/language/compile_time_constant_o_test.dart b/tests/language/compile_time_constant_o_test.dart
index 2438881d88971cd1d278b3169ed43e52a523a70f..c7a5afc533e9b80d2cce8eb9d937060a7955f210 100644
--- a/tests/language/compile_time_constant_o_test.dart
+++ b/tests/language/compile_time_constant_o_test.dart
@@ -9,10 +9,10 @@ const str = "foo";
 const m1 = const { "foo": 499 };
 const m2 = const { "$str": 499 };
 const m3 = const {
-                   "$str": 42, /// 01: static type warning
+                   "$str": 42, //# 01: static type warning
                    "foo": 499 };
 const m4 = const {
-                   "foo": 42, /// 02: static type warning
+                   "foo": 42, //# 02: static type warning
                    "$str": 499 };
 const m5 = const { "f" "o" "o": 499 };