Improve the error message of duplicated class declaration

[takaram]

Description

• Foo.php

  <?php
  class Foo {}

• Foo2.php

  <?php
  class Foo {}

• test.php

  <?php
  include 'Foo.php';
  include 'Foo2.php';

With these files, test.php gives this result:

PHP Fatal error:  Cannot declare class Foo, because the name is already in use in /path/to/Foo2.php on line 2

This error message includes nothing about Foo.php, which sometimes makes debugging hard.
It would be nice if the error message includes the file path and line number of previously declared class. Probably like this:

PHP Fatal error:  Cannot declare class Foo, because the name is already in use (declared in /path/to/Foo.php on line 2) in /path/to/Foo2.php on line 2