Implements support for reflection on parameters.

reflectable/lib/src/encoding_constants.dart

 // Copyright (c) 2015, the Dart Team. All rights reserved. Use of this
 // source code is governed by a BSD-style license that can be found in
 // the LICENSE file.
 
 library reflectable.encoding_constants;
 
 // The first `flagsBit-1` bits are used to enumerate the "kind" of the
 // declaration. The more significant bits are flags.
 const flagsBit = 4;
 
 // Kinds:
 const generativeConstructor = 0;
 const factoryConstructor = 1;
 const method = 2;
 const getter = 3;
 const setter = 4;
 const field = 5;
+const parameter = 6;
 
 // Flags:
 const staticAttribute = 1 << (flagsBit);
 const privateAttribute = 1 << (flagsBit + 1);
 const syntheticAttribute = 1 << (flagsBit + 2);
 const constAttribute = 1 << (flagsBit + 3);
 const redirectingConstructorAttribute = 1 << (flagsBit + 4);
 const abstractAttribute = 1 << (flagsBit + 5);
 const finalAttribute = 1 << (flagsBit + 6);
+const hasDefaultValueAttribute = 1 << (flagsBit + 7);
+const optionalAttribute = 1 << (flagsBit + 8);
+const namedAttribute = 1 << (flagsBit + 9);
+const dynamicAttribute = 1 << (flagsBit + 10);
+const classTypeAttribute = 1 << (flagsBit + 11);
 
 int kindFromEncoding(int encoding) => encoding & ((1 << flagsBit) - 1);