Xcode versions prior to 12
roland.kakonyi
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You can add -Xfrontend -disable-implicit-concurrency-module-import to OTHER_SWIFT_FLAGS to avoid import _Concurrency in .swiftinterface files.
Useful if you ship a closed source product and want to allow using it with Xcode versions prior to 13.
Same happens with me, running iOS 14.0 (18A5319i).