Description:
------------
$this is not generally allowed outside an object context, but sometimes it is.

I discovered this while trying to write a cheeky little base-class that would 
allow you to decorate objects with new methods, at run-time.

I would have gotten away with it, too - and I still could of course, only I would 
have to break from the convention of $this, and naming the context-object 
something else, which kind of sucks.


Test script:
---------------
<?php

$foo = function($this)
{
  var_dump($this); // this will work!
};

$foo('bar');

// now an object:

class Test
{
  public $foo = 'bar';
}

$test = new Test;

// and another closure:

$ouch = function($this)
{
  var_dump($this->bar); // this will blow up
};

$ouch($test);


Expected result:
----------------
The two examples should either fail consistently, or succeed consistently.

From my point of view, why should I not be allowed to have a local variable named 
$this if I wanted to? There's nothing special or magical about this variable, 
besides the fact that it gets automatically assigned on call.


Actual result:
--------------
The second example fails.