Yes I was also seeing this issue, the Xcode project needs the swift-version 3 set and some files were moved around during a URLSession change
See if these 2 PRs fix it for you, they worked for me https://github.com/apple/swift-corelibs-foundation/pull/1017 https://github.com/apple/swift-corelibs-foundation/pull/1006 si > On 2 Jun 2017, at 12:08, Sai Kanduri via swift-corelibs-dev > <swift-corelibs-dev@swift.org> wrote: > > Hi All, > > Latest Foundation code with XCode 8.3.2 does not compile successfully for me. > Is anyone else also seeing this ? > > -Sai Hema > > _______________________________________________ > swift-corelibs-dev mailing list > swift-corelibs-dev@swift.org > https://lists.swift.org/mailman/listinfo/swift-corelibs-dev _______________________________________________ swift-corelibs-dev mailing list swift-corelibs-dev@swift.org https://lists.swift.org/mailman/listinfo/swift-corelibs-dev