Description:
------------
While it is possible to use a class constant as default parameter, and while it is possible to use in the form of "self::X", this does not work when we try to reflect such parameter (see below).

It was tested with php5.1.4 (my default version), php5.2-win32-200608150830, and php6.0-win32-200608150830.

If using a class constant as a default parameter is not possible, then it should be said in the doc :

http://fr.php.net/manual/en/language.oop5.paamayim-nekudotayim.php

Don't not say much.

Reproduce code:
---------------
class Foo {
  const X = 1;
  public function x($x = self::X) {}
}
$clazz = new ReflectionClass('Foo');
$method = $clazz->getMethod('x');
foreach ($method->getParameters() as $param) {
  if ( $param->isDefaultValueAvailable())
    echo '$', $param->getName(), ' : ', $param->getDefaultValue(), "\n";
}

Expected result:
----------------
should work, eg: display $x = 1

Actual result:
--------------
Fatal error: Cannot access self:: when no class scope is active in D:\documents\xxx\desktop\php6.0-win32-200608150830\truc.php on line 10