Description:
------------
When throwing an exception from a custom error handler, PHP sometimes dies with a non-obvious error as the actual problem is hidden.

To reproduce, create a simple set_error_handler() and throw an exception (ErrorException here) whenever an error occur (with error_reporting set to -1 for instance).

If you try to output a not-defined variable, you will see the Exception. But, if you call a method on a not-defined variable, the exception is not thrown, and an error message is displayed instead. Debugging is not trivial as the real problem is masked.


Test script:
---------------
set_error_handler(function ($level, $message, $file, $line, $context)
{
  throw new \ErrorException($message);
});

// will throw an Exception (Undefined variable: foo)
// echo $foo;

// will not throw the exception, PHP will try to call bar() instead
$foo->bar();


Expected result:
----------------
PHP Fatal error:  Uncaught exception 'ErrorException' with message 'Undefined variable: foo' in ..:..

Actual result:
--------------
PHP Fatal error:  Call to a member function bar() on a non-object in ... on line 0