Remove AsyncError with Expando.

pkg/scheduled_test/lib/src/substitute_future.dart

Index: pkg/scheduled_test/lib/src/substitute_future.dart
diff --git a/pkg/scheduled_test/lib/src/substitute_future.dart b/pkg/scheduled_test/lib/src/substitute_future.dart
index 4122a3ddc277492a5d994256a103064b76081750..abbb5d4f75058ab14fe2ac3ba480c12cf9e75759 100644
--- a/pkg/scheduled_test/lib/src/substitute_future.dart
+++ b/pkg/scheduled_test/lib/src/substitute_future.dart
@@ -24,9 +24,9 @@ class SubstituteFuture<T> implements Future<T> {
   }
 
   Stream<T> asStream() => _completer.future.asStream();
-  Future catchError(onError(AsyncError asyncError), {bool test(error)}) =>
+  Future catchError(onError(asyncError), {bool test(error)}) =>
     _completer.future.catchError(onError, test: test);
-  Future then(onValue(T value), {onError(AsyncError asyncError)}) =>
+  Future then(onValue(T value), {onError(error)}) =>
     _completer.future.then(onValue, onError: onError);
   Future<T> whenComplete(action()) => _completer.future.whenComplete(action);