Import rasta tests.

pkg/fasta/test/rasta/bad_interpolation.dart

Index: pkg/fasta/test/rasta/bad_interpolation.dart
diff --git a/pkg/fasta/test/rasta/bad_interpolation.dart b/pkg/fasta/test/rasta/bad_interpolation.dart
new file mode 100644
index 0000000000000000000000000000000000000000..98fd62e1573d05bec4f9a0e0781b6159189b0a1a
--- /dev/null
+++ b/pkg/fasta/test/rasta/bad_interpolation.dart
@@ -0,0 +1,7 @@
+// 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.
+
+main() {
+  print(" $x.);
+}