Update all tests

tests/language/const_objects_are_immutable_test.dart

Index: tests/language/const_objects_are_immutable_test.dart
diff --git a/tests/language/const_objects_are_immutable_test.dart b/tests/language/const_objects_are_immutable_test.dart
index eb32b400e68823593bfa6fa0c2b75c740da5054f..8028818d2af3d00f7dbab202717e065d14a68ba3 100644
--- a/tests/language/const_objects_are_immutable_test.dart
+++ b/tests/language/const_objects_are_immutable_test.dart
@@ -24,6 +24,6 @@ main() {
   Expect.equals(1, a1.x);
 
   A a2 = const A(1, 2);
-  Expect.throws(() => a2.x = 499); /// 01: static type warning
+  Expect.throws(() => a2.x = 499); //# 01: static type warning
   Expect.equals(1, a2.x);
 }