Description:
------------
Methods may use semi-reserved keywords, however it is not possible to alias a method named "namespace". According to the error, the alias statement somehow becomes equivalent to 'as as bar'.

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

trait A {
    function namespace() {}
}

class C {
    use A {
        namespace as bar;
    }
}

Expected result:
----------------
No error. This should be no different than if the method were named 'foo' and then using 'foo as bar'.

Actual result:
--------------
Fatal error: An alias (bar) was defined for method as(), but this method does not exist in /in/DmNne on line 7