SE-0353 provides the ability to compose SE-0309 (“Unlock existentials for all protocols”) and SE-0346 (“Lightweight same-type requirements for primary associated types”) to write code such as any Sequence<String>.
It’s a huge feature in its own right, but once you understand the component parts hopefully you can see how it all fits together!
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Other changes in Swift 5.7…
- if let shorthand for unwrapping optionals
- Multi-statement closure type inference
- Clock, Instant, and Duration
- Regular expressions
- Type inference from default expressions
- Concurrency in top-level code
- Opaque parameter declarations
- Structural opaque result types
- Unlock existentials for all protocols
- Lightweight same-type requirements for primary associated types
- Distributed actor isolation
- buildPartialBlock for result builders
- Implicitly opened existentials
- Swift snippets
- Unavailable from async attribute
Download all Swift 5.7 changes as a playground Link to Swift 5.7 changes
