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- Opt-in for existing and new projects
- Steps per module
- Enable strict complete checking, resolve warnings
- Enable swift 6
- Audit unsafe opt-outs
- These are enabled on a per-target basis
- Mutable global variables can be marked with main actor (or other global actors)
- They can also be marked
nonisolated(unsafe), if safety is guaranteed by some other dispatch context system.
- Global variables in swift are initialized lazily, but creation is guaranteed atomic
- When dealing with library delegates that don’t specify explicit actors, but are known to always be dispatched on the main actor (for example)
MainActor.assumeIsolated { ...code ... } or @preconcurrency ...protocol conformance- Both of these trap if the actor assumption is false