Description:
------------
An abstract static method can be overridden by a non-static method in a child class if it originates from a trait. Usually this would generate a compile error.

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

trait T {
    public function foo() {}
}

abstract class A {
    abstract static function foo();
}

class B extends A {
    // This throws an error:
    // Cannot make static method A::foo() non static in class B
    //public function foo() {}

    // This doesn't:
    use T;
}

Expected result:
----------------
Fatal error: Cannot make static method A::foo() non static in class B

Actual result:
--------------
Nothing