_runtime(_multithreaded) is available only in the main snapshot toolchain, but unavailable in 6.0. However, we cannot distinguish them because compiler(>=6.1) is still false in the main snapshot toolchain. Thus add hasFeature(IsolatedAny2) condition, which is only available in main snapshot toolchains.
_runtime(_multithreaded)is available only in the main snapshot toolchain, but unavailable in 6.0. However, we cannot distinguish them becausecompiler(>=6.1)is still false in the main snapshot toolchain. Thus addhasFeature(IsolatedAny2)condition, which is only available in main snapshot toolchains.