Evolution

Pitches The Pitches category is an area for pitching ideas for evolution of the Swift language prior to a formal review. Announcements This category is for announcements of Swift evolution proposal reviews and results, as well as other administrative announcements. Creation of new topics in this category is by site admins and Swift Core Team members only, although anyone can reply to topics once created. Proposal Reviews This category is for posting Swift Evolution proposals for review and feedback. Discussion The Evolution Discussion category is for general discussion of the evolution of the Swift language.

Topic	Replies	Views	Activity
Swift Concurrency Roadmap Discussion concurrency	169	88682	June 7, 2021
Improving the UI of generics Discussion	179	61443	February 22, 2022
A New Approach to Testing in Swift Discussion testing , xctest , unit-testing , swift-testing	118	41184	October 24, 2024
Embedded Swift Pitches embedded , runtime , pitch , metadata	203	32955	August 17, 2024
A roadmap for improving Swift performance predictability: ARC improvements and ownership control Pitches	268	56594	August 20, 2024
Declarative String Processing Overview Pitches	120	19313	October 19, 2021
The state of Swift documentation Discussion	46	11523	September 1, 2020
[Pitch] if and switch expressions Pitches	94	11924	December 7, 2022
Swift type checking is undecidable Discussion	44	32019	November 9, 2020
[Pitch] Default values for string interpolations Pitches	59	4950	April 10, 2025
The future of serialization & deserialization APIs Discussion foundation , codable , macros	157	15453	September 22, 2025
Pitch: an Official Style Guide and Formatter for Swift Pitches	253	29808	March 19, 2019
[Pitch] Introduce existential `any` Pitches	203	15481	December 9, 2021
Lifting the "Self or associated type" constraint on existentials Pitches	163	22760	April 23, 2021
[Meta] Name deprecation notice Discussion	9	3517	February 3, 2021
Modify Accessors Pitches	303	33951	August 20, 2024
A Possible Vision for Macros in Swift Pitches	136	34415	June 20, 2023
Key Path Expressions as Functions Pitches	52	14280	May 7, 2019
Macro Adoption Concerns around SwiftSyntax Discussion swift-syntax , macros	105	18187	April 28, 2025
SwiftPM support for Swift scripts Pitches packagemanager	86	16641	May 27, 2021
[Pitch] Reflection Pitches reflection	60	14859	June 10, 2024
Precise error typing in Swift Discussion error-handling	89	12863	September 20, 2023
Serialization in Swift Discussion	169	25304	February 1, 2024
[Pitch] Observation Pitches	111	19520	March 17, 2023
Swift Package Registry Service Pitches packagemanager	97	29884	June 25, 2025
Pitch: Standard Library Preview Package Pitches	42	7633	July 27, 2019
[Accepted with Modification] SE-0296: async/await Announcements	32	21441	April 10, 2021
Integer generic parameters Pitches	131	6928	December 26, 2024
Pitching The Start of Variadic Generics Pitches generics	72	11868	December 4, 2021
[Accepted with modification] SE-0258: Property Wrappers Announcements	13	5389	February 24, 2021
[Prospective Vision] Improving the approachability of data-race safety Pitches concurrency , visions	183	13572	February 19, 2025
[Pitch] Clock, Instant, Date, and Duration Pitches concurrency , stdlib , time	317	21548	December 13, 2021
An Informal Introduction to Move-Only Types Discussion	27	10062	November 14, 2022
[Accepted with modifications] SE-0453: InlineArray (formerly: Vector, a fixed-size array) Announcements	80	5146	April 22, 2025
Vector, a fixed-size array Pitches array	271	13455	December 6, 2024
Function builders implementation progress Discussion	24	11609	June 24, 2020
Support use of an optional label for the first trailing closure Pitches	122	11800	March 16, 2021
Support async calls in defer bodies Pitches	49	2116	September 1, 2025
[Pitch] A Vision for WebAssembly Support in Swift Pitches webassembly , wasi	26	13615	April 15, 2025
Noncopyable Generics in Swift: A Code Walkthrough Discussion generics , swift-evolution , noncopyable , tutorial	47	6461	March 25, 2024
Piecemeal adoption of Swift 6 improvements in Swift 5.x Pitches	49	9564	June 22, 2022
Proposal draft for `is case` (pattern-match boolean expressions) Pitches	57	8025	February 15, 2023
Let's fix `if let` syntax Pitches	221	17937	July 28, 2021
Design Priorities for the Swift 6 Language Mode Announcements	79	20719	October 11, 2023
[Pre-Pitch] Import access control: a modest proposal Pitches	65	10739	April 3, 2022
Variadic Generics Pitches generics	99	13983	July 29, 2022
Progress toward the Swift 6 language mode Announcements	32	19759	February 15, 2024
`if let` shorthand Pitches	269	35159	April 9, 2022
[Pitch] Extensions on bound generic types Pitches	40	5092	June 22, 2022
Differentiable Programming Mega-Proposal Pitches autodiff	151	43353	July 26, 2020