What's New in Swift

Swift 6.4

What's new in Swift 6.4

Explore focused improvements to Swift's language and compiler, with concise explanations and practical examples.

Highlighted features

01 · Compiler diagnostics

@diagnose

Ignore, enable, or promote specific warning groups inside a declaration.

 02 · Type syntax

Optional any and some

Write optional existential and opaque types without extra parentheses.

 03 · Concurrency

Async calls in defer

Call asynchronous functions while performing deferred cleanup.

 04 · Concurrency

Warnings for unhandled task errors

Catch errors that could otherwise be silently ignored inside an unstructured task.

 05 · Availability

anyAppleOS availability

Mark APIs as available across all Apple platforms with one shared OS version.