error: cannot inherit from class 'NSLock' because it has overridable members that could not be loaded

[clackary]

The following code snippet builds successfully with the 2024-07-15 nightly toolchain, but fails to build with 2024-07-22. I'm not sure how to check or verify this was caused by the switch to swift-foundation, but the timing seems to line up.

import Foundation

class FooLock: NSLock {}

Actual behavior:

/project/repro.swift:3:7: error: cannot inherit from class 'NSLock' because it has overridable members that could not be loaded
1 | import Foundation
2 | 
3 | class FooLock: NSLock {}
  |       |- error: cannot inherit from class 'NSLock' because it has overridable members that could not be loaded
  |       `- note: could not deserialize 'mutex'
4 | 

Worth noting that it does seem specific to Linux, because the same snippet builds successfully with recent toolchains on macOS.

Expected behavior:
Code builds successfully.

Configuration:
OS: Linux Ubuntu 22.04
Toolchain: swift-DEVELOPMENT-SNAPSHOT-2024-07-22-a-ubuntu22.04-aarch64 or newer

[clackary]

Realizing that NSLock comes from swift-corelibs-foundation. Filed a new issue over there -- https://github.com/apple/swift-corelibs-foundation/issues/5076