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I'm trying to migrate my Swift 3 project to Swift 4 in Xcode 9. After selecting target and choosing either of @obcj inference options, Xcode stuck on Generating preview spinning wheel forever. How can I migrate my project?
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On the same conversion dialog uncheck Remind me checkbox and click Convert Later. Now go to Build Settings and change Swift Language Version to Swift 4.0. Most likely this will produce a lot of warnings or errors. Unfortunately you have to fix them manually.
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