What Claude31 said but also…
If you have code that compiles in Xcode 11.3 but fails to compile in Xcode 11.4 beta, you should file a bug about that. Swift is intended to be source compatible from release to release. There are some cases where the code is broken and it’s not possible for the new compiler to maintain compatibility, but all such situations warrant investigation.
Please post your bug number, just for the record.
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Apple Developer Relations, Developer Technical Support, Core OS/Hardware
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