Changes for landing https://github.com/dart-lang/sdk/issues/32161
Add void declarations to methods with implicit dynamic returning void
values, which may be illegal in dart 2, but in either case, expresses
the current intent better.
diff --git a/test/observable_test.dart b/test/observable_test.dart
index af4d9c3..3a05e2d 100644
--- a/test/observable_test.dart
+++ b/test/observable_test.dart
@@ -9,7 +9,7 @@
import 'observable_test_utils.dart';
-main() => observableTests();
+void main() => observableTests();
void observableTests() {
// Track the subscriptions so we can clean them up in tearDown.
