Hm, this could be a problem: on Linux they aren't objects.

For background, the code motivating this bug is an Array extension:

extension RangeReplaceableCollectionType where Generator.Element : AnyObject {
    /// Remove first colleciton element that matches the given reference
    mutating func removeItemMatchingReference(object : Generator.Element) {
        if let index = self.indexOf({$0 === object}) {
            self.removeAtIndex(index)
        }
    }
}

This code can be used to remove a semaphore from an array.

It is actually quite nonintuitive to fix this code to compile on Linux (although I did), chiefly because there is nothing obvious one can replace the where Generator.Element : AnyObject with that works for dispatch_sempahore_t.

Are we not going to bridge the dispatch objects to AnyObject (e.g. not necessarily NSObject) on the Swift runtime? I know NSObject bridging isn't available, but I think AnyObject would be appropriate to bridge...

Comment by David Grove (JIRA)

I submitted #61 which fixes this issue.

Comment by David Grove (JIRA)

made obsolete by Swift 3 dispatch overlay changes.