Swift Structured Concurrency Proposals

StructuredConcurrencyProposals.md

• async/await and Structured Concurrency introduce the syntactical building blocks (including the Task type) for writing asynchronous code using Swift-native language features.
• There is a WIP standalone proposal to add async let syntax to greatly reduce a pain point of filling values asynchronously for later use.
• actor types introduce a new top-level reference type (like class) that require and statically enforce that access to any of their mutable state be done asynchronously (such as by using the async/await syntax), and exist to help model thread-safe mutable data structures. The idea of global actors enables single-declaration actor isolation, such as with @MainActor.
• A few other related proposals that fill in additional detail around those big three include the idea of continuations, a feature for bridging async/await code with existing completion-handler-based async code, and proposals dealing with the implications of the new features for closures and Objective-C interoperability.