The new ClassLoader swallows Fatal Errors
Since the new ClassLoader uses '@include' to load classes E_COMPILE_ERROR errors are completely
ignored. The aren't shown (display_errors), logged to the php log (log_errors) or logged
anywhere through Flow. The main issue seems, that the combination of the @ error control character
and set_error_handler let those E_COMPILE_ERROR slip through.
The only way around this was to register a shutdown function to catch those errors.