Import rasta tests.

pkg/fasta/test/rasta/issue_000012.dart

Index: pkg/fasta/test/rasta/issue_000012.dart
diff --git a/pkg/fasta/test/rasta/issue_000012.dart b/pkg/fasta/test/rasta/issue_000012.dart
new file mode 100644
index 0000000000000000000000000000000000000000..94fdd2fea2932ea0b56cdea6793194211f858733
--- /dev/null
+++ b/pkg/fasta/test/rasta/issue_000012.dart
@@ -0,0 +1,17 @@
+// 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 {
+  var field;
+}
+
+class B extends A {
+  m() {
+    super.field = 42;
+  }
+}
+
+main() {
+  new B().m();
+}