Emit compile-time error for incorrectly used optional parameters.

tests/language/parameter_default_test.dart

Index: tests/language/parameter_default_test.dart
diff --git a/tests/language/parameter_default_test.dart b/tests/language/parameter_default_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..88d4d3d87e0e22fb9701719a220363a21049f816
--- /dev/null
+++ b/tests/language/parameter_default_test.dart
@@ -0,0 +1,35 @@
+// Copyright (c) 2013, 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.
+
+class C {
+  foo(a
+      : 1  /// 01: compile-time error
+      = 1  /// 02: compile-time error
+  ) { print(a); }
+
+  static bar(a
+      : 1  /// 03: compile-time error
+      = 1  /// 04: compile-time error
+  ) { print(a); }
+}
+
+baz(a
+    : 1  /// 05: compile-time error
+    = 1  /// 06: compile-time error
+) { print(a); }
+
+main() {
+  foo(a
+      : 1  /// 07: compile-time error
+      = 1  /// 08: compile-time error
+  ) { print(a); }
+
+  foo(1);
+
+  new C().foo(2);
+
+  C.bar(3);
+
+  baz(4);
+}