crash.swift

import Foundation

enum Foo: Error {
    case dogAteHomework
}

func makesAnError(_ error: NSErrorPointer) {
    autoreleasepool {
        error?.pointee = Foo.dogAteHomework as NSError
    }
}

var err: NSError? = nil
makesAnError(&err) // EXC_BAD_ACCESS in objc_retain

print(err)

The best fix I've found so far:

func makesAnError(_ error: NSErrorPointer) {
    var localError: NSError?
    autoreleasepool {
        localError = Foo.dogAteHomework as NSError
    }
    error?.pointee = localError
}