Description:
------------
Subclassing the SoapClient class and wrapping the call to the parent constructor will throw a fatal error even when wrapped in a try...catch(\Throwable $t).

With PHP 7.3.2 try...catch(\Throwable $t) being a convenient method of adding fault tolerance and graceful degradation -- it is therefore very frustrating when a WSDL PARSE issue is encountered that an UNCATCHABLE script exiting fatal error is issued.

Test script:
---------------
<?php
class SoapAgent extends \SoapClient
{
    public function __construct(string $wsdl)
    {
        try {
            parent::__construct($wsdl);
            echo 'Success!' . PHP_EOL;
        } catch (\Throwable $t) {
            var_dump($t);
        }
    }
}

$client = new SoapAgent('test');

Expected result:
----------------
var_dump() of the Throwable object.

Actual result:
--------------
Fatal error: SOAP-ERROR: Parsing WSDL: Couldn't load from 'test' : failed to load external entity "test"

Process finished with exit code 255