Import rasta tests.

pkg/fasta/test/rasta/cascades.dart

Index: pkg/fasta/test/rasta/cascades.dart
diff --git a/pkg/fasta/test/rasta/cascades.dart b/pkg/fasta/test/rasta/cascades.dart
new file mode 100644
index 0000000000000000000000000000000000000000..add829eb1c09412da28dca750622fa8754ffa4b0
--- /dev/null
+++ b/pkg/fasta/test/rasta/cascades.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2016, 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.md file.
+
+class A {
+  add(x) => x;
+}
+
+main() {
+  var a = new A();
+  f(x) => x;
+  a..add(f)('WHAT');
+}