XMLParser crashes when trying to parse a feed URL offline

I'm trying to have this fixed. It's clearly a bug. I've already submited a bug report (28904764) and a Radar, but never had any bugs closed and fixed. They just stay there indefinitely in the bug report portal. So, maybe some exposure will help?

I tried to isolate the issue:

This works:

if let parser = XMLParser(contentsOf: feedURL) { 
     print("Got instance \(parser)") 
}

This does not:

class Parser: XMLParser { } 

if let parser = Parser(contentsOf: feedURL) { 
     print("Got instance \(parser)") 
}

It's clean project, with nothing but those lines of code. The issue appears to happen only to subclasses of the XMLParser.

Can we ger a fix for this?