Double-free with FilePath in Xcode 13 beta

[varungandhi-apple]

Originally reported as https://bugs.swift.org/browse/SR-14895 by @Frizlab.

FilePath crashes (double-free) with the following code

import Foundation
import System

if #available(macOS 12.0, *) {
	let relative = FilePath("Versions")
	_ = FilePath("/a/b/c").appending(relative.components)
	print(relative)
}

Demo repo: https://gitlab.com/frizlab-demo-projects/pathcrash

It does not crash when using SystemPackage version 0.0.2 instead of System (either in release or debug compilation mode).

Configuration: macOS 12.0 Beta (21A5268h) with Xcode 13.0 beta (13A5155e)

[Frizlab]

Note it only crashes when using the pre-built System framework in macOS 12 beta, not when using SystemPackage via SPM.

[milseman]

This is due to a bug in the compiler (it doesn't emit consuming annotations in swift interface files), which will hopefully be fixed soon.

[Frizlab]

Seems fixed in macOS 21A5304g, Xcode 13 beta 5 (13A5212g).
The issue can probably closed (I don’t seem to have the permission to do that).