Error produced for missing var, final, const or type on field declarations.

tests/language/field_decl_missing_var_type_test.dart

Index: tests/language/field_decl_missing_var_type_test.dart
diff --git a/tests/language/field_decl_missing_var_type_test.dart b/tests/language/field_decl_missing_var_type_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c34ad3165155615d900bc30ae8f6b37945838c91
--- /dev/null
+++ b/tests/language/field_decl_missing_var_type_test.dart
@@ -0,0 +1,15 @@
+// Copyright (c) 2012, 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.
+// Dart test program for constructors and initializers.
+
+// Exercises issue 2997, missing var or type on field declarations should
+// generate a compile-time error.
+
+class A {
+  _this;                      /// 01: compile-time error
+  A(x) : this._this = x;      /// 01: continued
+}
+main() {
+  new A(0);                   /// 01: continued
+}