Thanks for reporting this! I think this is an issue we fixed in Swift 5 / Xcode 10.2, but can you attach your source as a text file so we can be sure?

Comment by Anmol Malhotra (JIRA)

Omg. 😃 Can't believe I actually found a bug in Swift. 😛

I will upload my source file as first thing in the morning once I reach my office.

Thanks a lot for replying @belkadan. Big fan. 🙂

Comment by Anmol Malhotra (JIRA)

Hey @belkadan, I have added the source file in attachments. Let me know if you need anything else.

Can't reproduce on master. Tried with 4.2 as well, but it compiles fine. Is this the correct source file? anmol (JIRA User)

Comment by Anmol Malhotra (JIRA)

Hey @theblixguy, I uploaded the file without the bug. Sorry about that. Please try now. Let me know if you need anything else.

Thanks! I can reproduce this on 5.1. What's causing this to happen is the initialiser in the extension on the enum, which is called when initialising the static property. This causes the compiler to (try) synthesise raw representable conformance even though we can't do that with enum cases that have a payload. Here's a reduced test case:

enum Crash: String {
  case foo
  case bar(String)
  static let shared = Crash()
}

extension Crash {
  init() {
    self = .foo
  }
}

The fix for this is basically to not do that. I'll open a PR to fix this shortly.

PR: #23357

Fixed on master. I have cherry picked the fix to the 5.1 branch too.