Add type arguments to SyntheticInvocation.

R=floitsch@google.com

Review-Url: https://codereview.chromium.org//2971283002 .
diff --git a/pubspec.yaml b/pubspec.yaml
index 4ba307d..07cb622 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: collection
-version: 1.14.1
+version: 1.14.2
 author: Dart Team <misc@dartlang.org>
 description: Collections and utilities functions and classes related to collections.
 homepage: https://www.github.com/dart-lang/collection
diff --git a/test/wrapper_test.dart b/test/wrapper_test.dart
index df26c87..9067426 100644
--- a/test/wrapper_test.dart
+++ b/test/wrapper_test.dart
@@ -60,6 +60,9 @@
   final int _type;
   const SyntheticInvocation(this.memberName, this.positionalArguments,
       this.namedArguments, this._type);
+
+  List<Type> get typeArguments => const <Type>[];
+
   bool get isMethod => _type == METHOD;
 
   bool get isGetter => _type == GETTER;