Description:
------------
When the base class of a dynamically loaded class is not found, PHP raises a fatal error instead of throwing an exception.



Test script:
---------------
<?php
spl_autoload_register(function ($class_name) {
	if (file_exists(__DIR__ . "/{$class_name}.php")) {
		include __DIR__ . "/{$class_name}.php";
	}
});

// Following code throws an exception since CDE is not found
try {
	$a = new CDE();
} catch (\Throwable $e) {
	echo 'CAUGHT CDE', PHP_EOL;
}

/*
 * Create ABC.php with an empty class ABC extending base class CDE
 * <?php class ABC extends CDE {}
 */
// Following code raises a fatal error since CDE (base class of ABC) is not found
try {
	$a = new ABC();
} catch (\Throwable $e) {
	echo 'CAUGHT CDE', PHP_EOL;
}


Expected result:
----------------
CAUGHT CDE
CAUGHT CDE

Actual result:
--------------
CAUGHT CDE
PHP Fatal error:  Class 'CDE' not found in /path/to/file/ABC.php on line 3

Fatal error: Class 'CDE' not found in /path/to/file/ABC.php on line 3