multi-test for invalid double

tests/language_2/double_invalid_test.dart

Index: tests/language_2/double_invalid_test.dart
diff --git a/tests/language_2/double_invalid_test.dart b/tests/language_2/double_invalid_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..469de2e4993ef735c13a3c566cd458618f9b3a28
--- /dev/null
+++ b/tests/language_2/double_invalid_test.dart
@@ -0,0 +1,11 @@
+// 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.
+
+// Test an invalid double format
+
+main() {
+  3457e  //# 01: compile-time error
+  ;
+}
+