Add a test requiring Kernel's Erasure pass

tests/kernel/unsorted/generic_function_test.dart

Index: tests/kernel/unsorted/generic_function_test.dart
diff --git a/tests/kernel/unsorted/generic_function_test.dart b/tests/kernel/unsorted/generic_function_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..5b8a47eade817783acf659d1d6e1b13dca8efd44
--- /dev/null
+++ b/tests/kernel/unsorted/generic_function_test.dart
@@ -0,0 +1,23 @@
+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Tests of generic functions.
+
+import 'package:expect/expect.dart';
+
+typedef R Foo<R>();
+
+bar<R>(int body()) {
+  var function = () {
+    if (body is Foo<R>) {
+      return body();
+    }
+    return 42;
+  };
+  return function();
+}
+
+main(args) {
+  Expect.isTrue(bar(() => 43) == 43);
+}