EXC_BAD_ACCESS when trying to encode a subclass of a Codable-conformant class

Question

I must be a moron or something but I'm scratching my head for a third day in a row and can't figure out what's going wrong with my intention to encode some JSON data in my Swift program...

Here's the situation: I've got two classes as follows:

class Node: Codable {
    // Nothing in here
}

and

class Shape: Node {
    // No code here too
}

Then, I have an attempt to encode the subclass as follows:

do {
    let encodedData = try JSONEncoder().encode(Shape())
} catch {
    print(error)
}

This is all I have added to an empty Single View App project. When I run it, I get "Thread 1: EXC_BAD_ACCESS (code=1, address=0x350)" crash.

Of course, initially my classes used to have a lot of properties which were Codable too. I thought it was any of them, so I stripped them off but it appears it's not the properties that are causing the crash...

I'm running Xcode 9.3 on a High Sierra MacBook Pro. Is there anyone willing to reproduce this or anyone already bumped his head into such an odd behavior?

Answer 1

This is a known bug and you can work around it by turning on Whole Module Compilation mode for the Debug configuration, or by upgrading to Xcode 10 beta.