What new syntax additions are there in Swift 6?

In Swift 6, several new syntax additions and improvements have been introduced:

1. Data Race Safety: Swift 6 introduces a new language mode that provides data race safety guarantees, helping developers write correct concurrent programs. This feature is opt-in and can be adopted module by module.

2. Non-Copyable Types: Swift 6 introduces non-copyable types, which suppress the default copyability of Swift types. This is useful for scenarios where unique ownership is required, such as managing system resources like files.

3. Embedded Swift: A new language subset called Embedded Swift is introduced, which can run on highly constrained systems, such as operating system kernels and microcontrollers.

4. Typed Throws: Swift 6 introduces typed throws, allowing developers to specify the failure type in the API contract. This provides more control over error handling, especially in constrained environments.

5. Concurrency Improvements: There are enhancements to concurrency, including improvements to data race checking and the ability to pass non-sendable values across active isolation boundaries safely.

6. Swift Testing Framework: A new testing framework named Swift Testing is introduced, offering expressive APIs to simplify writing tests.

These features are part of the broader improvements in Swift 6 aimed at enhancing portability, performance, and the overall developer experience. For more details, you can refer to the session What’s new in Swift (17:03).