> On May 9, 2017, at 3:07 PM, Pushkar N Kulkarni via swift-dev > <swift-dev@swift.org> wrote: > In the process of debugging a bunch of consistent failures in > TestFoundation/TestNSURLSession, I came across a weird problem symptom in > this line of code > <https://github.com/apple/swift-corelibs-foundation/blob/master/Foundation/NSURLSession/NSURLSessionTask.swift#L329>. > > internalState = .transferInProgress(transferState) > > I had a suspicion that the above modification is not taking effect, since, > only based on this change the didSet observer for the `internalState` > property triggers data transfers using libcurl. So, I simply printed the > property before and after the assignment. > > print("before => \(internalState)") > internalState = .transferInProgress(transferState) > print("after => \(internalState)") > > Surprisingly, I don't see any change in the property value: > before => transferReady(Foundation.URLSessionTask._TransferState(... > <redacted> ...)) > after => transferReady(Foundation.URLSessionTask._TransferState(... > <redacted> ...)) > > When I switched back to the "swift-DEVELOPMENT-SNAPSHOT-2017-04-24-a" tag on > all the repos (except swift-corelibs-foundation), I do not see this problem. > I see: > before => transferReady(Foundation.URLSessionTask._TransferState(... > <redacted> ...)) > after => transferInProgress(Foundation.URLSessionTask._TransferState(... > <redacted> ...)) > > To put it in simple terms, the modification doesn't seem to be taking effect > with the current HEAD. > > I haven't been able to isolate this problem in an independent test case. > However, anybody who wants to reproduce it can simply run TestFoundation > after enabling the URLSession tests (which have been disabled for now) in > TestFoundation/main.swift. > > I did compare the `-emit-ir` outputs from the passing and failing levels. > There seems to be a clear difference in the way we store the new value of > this property. But given my limited exposure to debugging Swift compiler > issues, I wasn't able to progress further. > > Can someone help us here please? Thanks.
That sounds like a serious bug; please file it in JIRA. John.
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