Description:
------------
Redefining a constant in a required file produces a strange Notice.
This occurs on Commandline and Modul (both 4.3.8)

Reproduce code:
---------------
File main.php:
<?PHP
error_reporting( E_ALL );
define( 'FOO', 'MAIN' );
require_once( './sub.php' );
echo FOO;
?>

File sub.php:
<?PHP
define( 'FOO', 'SUB' );
?>

Expected result:
----------------
I would expect the Notice to complain about redefining FOO, not some weird chars.

Actual result:
--------------
Executing main.php (Commandline or Modul) I get ouptut like:

Notice: Constant ;?f@ already defined in [...]/sub.php on line 2
MAIN

The weird chars for the constant name differ.