Description:
------------
Is this suppose to work ? Currently it does not.

class Priority {
        const DEBUG = 0;
        const INFO = 1;
        const WARN = 2;
        const ERROR = 3;
        const FATAL = 4;

        const MAX_PRIORITY = FATAL;
}

class ExtendedPriority extends Priority {
        const REMOTE = Priority::MAX_PRIORITY + 1;
        const URGENT = Priority::MAX_PRIORITY + 2;
}

if it's not supposed to work, there is some parser problem in ZE2 that accepts a constant expression based on string concatenation.

Reproduce code:
---------------
class test {
        const TEST = "hi";
        const TEST1 = self::TEST . "ih";
}


Expected result:
----------------
No parser error nor core dumps. Or a paser error if it's not supposed to work.

Actual result:
--------------
Segmentation Fault