Fix analysis errors in expect_async.dart. (#544)

diff --git a/ b/
index 9881978..d5d95a6 100644
--- a/
+++ b/
@@ -1,3 +1,7 @@
+## 0.12.18+2
+* Fix analysis errors having to do with the `expectAsync()` function.
 ## 0.12.18+1
 * Fix the deprecated `expectAsync()` function. The deprecation caused it to
diff --git a/lib/src/frontend/expect_async.dart b/lib/src/frontend/expect_async.dart
index b0c0063..af0f16b 100644
--- a/lib/src/frontend/expect_async.dart
+++ b/lib/src/frontend/expect_async.dart
@@ -25,12 +25,12 @@
 // ([dynamic]) -> dynamic.
 typedef _Func0();
-typedef _Func1(A a);
-typedef _Func2(A a, B b);
-typedef _Func3(A a, B b, C c);
-typedef _Func4(A a, B b, C c, D d);
-typedef _Func5(A a, B b, C c, D d, E e);
-typedef _Func6(A a, B b, C c, D d, E e, F f);
+typedef _Func1(a);
+typedef _Func2(a, b);
+typedef _Func3(a, b, c);
+typedef _Func4(a, b, c, d);
+typedef _Func5(a, b, c, d, e);
+typedef _Func6(a, b, c, d, e, f);
 typedef bool _IsDoneCallback();
diff --git a/pubspec.yaml b/pubspec.yaml
index 150ab3d..20bbdfe 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 0.12.18+1
+version: 0.12.18+2
 author: Dart Team <>
 description: A library for writing dart unit tests.