Description:
------------
Segmentation fault with Cls::{expr}() syntax when expr is not string.

also $cls->{expr}() syntax.

Test script:
---------------
Cls::{0}();
Cls::{1.0}();
Cls::{true}();
Cls::{false}();
Cls::{null}();

$cls->{0}();
$cls->{1.0}();
$cls->{true}();
$cls->{false}();
$cls->{null}();


Expected result:
----------------
Fatal error: Method name must be a string

(Occurred by code "$cls->{0}();" on php5.3)

Actual result:
--------------
Segmentation fault

(each line)