Swift Evolution — May 29, 2026

Ingested at: 2026-05-29T08:03:00Z

533 active proposals in the repository.

Recent Commits (last 10)

• f311762 Update 0527-rigidarray-uniquearray.md (#3311) — Stephen Canon (2026-05-27)
• 3524699 Merge pull request #3308 from NotTheNHK/patch-4 — John McCall (2026-05-26)
• 6ea34cf Merge pull request #3310 from swiftlang/se-0532-review-link — John McCall (2026-05-26)
• 75dff8e Link SE-0532 to its review — John McCall (2026-05-26)
• 8ad397f Merge pull request #3295 from Azoy/optional-noncopyables — John McCall (2026-05-26)
• d3bbb1e Assign SE-0532 to the optional improvements proposal and put it in review — John McCall (2026-05-26)
• d91c037 Merge pull request #3268 from tshortli/default-implementations-satisfy-proto-requirements-se0444 — Becca Royal-Gordon (2026-05-26)
• a27ea51 Accept SE-0444 amendment — Becca Royal-Gordon (2026-05-26)
• 6daabb8 More cleanup — Barreloofy (2026-05-26)
• aa4caa8 Apply suggestions — NotTheNHK (2026-05-26)

All Proposals

• 0001-keywords-as-argument-labels
• 0002-remove-currying
• 0003-remove-var-parameters
• 0004-remove-pre-post-inc-decrement
• 0005-objective-c-name-translation
• 0006-apply-api-guidelines-to-the-standard-library
• 0007-remove-c-style-for-loops
• 0008-lazy-flatmap-for-optionals
• 0009-require-self-for-accessing-instance-members
• 0010-add-staticstring-unicodescalarview
• 0011-replace-typealias-associated
• 0012-add-noescape-to-public-library-api
• 0013-remove-partial-application-super
• 0014-constrained-AnySequence
• 0015-tuple-comparison-operators
• 0016-initializers-for-converting-unsafe-pointers-to-ints
• 0017-convert-unmanaged-to-use-unsafepointer
• 0018-flexible-memberwise-initialization
• 0019-package-manager-testing
• 0020-if-swift-version
• 0021-generalized-naming
• 0022-objc-selectors
• 0023-api-guidelines
• 0024-optional-value-setter
• 0025-scoped-access-level
• 0026-abstract-classes-and-methods
• 0027-string-from-code-units
• 0028-modernizing-debug-identifiers
• 0029-remove-implicit-tuple-splat
• 0030-property-behavior-decls
• 0031-adjusting-inout-declarations
• 0032-sequencetype-find
• 0033-import-objc-constants
• 0034-disambiguating-line
• 0035-limit-inout-capture
• 0036-enum-dot
• 0037-clarify-comments-and-operators
• 0038-swiftpm-c-language-targets
• 0039-playgroundliterals
• 0040-attributecolons
• 0041-conversion-protocol-conventions
• 0042-flatten-method-types
• 0043-declare-variables-in-case-labels-with-multiple-patterns
• 0044-import-as-member
• 0045-scan-takewhile-dropwhile
• 0046-first-label
• 0047-nonvoid-warn
• 0048-generic-typealias
• 0049-noescape-autoclosure-type-attrs
• 0050-floating-point-stride
• 0051-stride-semantics
• 0052-iterator-post-nil-guarantee
• 0053-remove-let-from-function-parameters
• 0054-abolish-iuo
• 0055-optional-unsafe-pointers
• 0056-trailing-closures-in-guard
• 0057-importing-objc-generics
• 0058-objectivecbridgeable
• 0059-updated-set-apis
• 0060-defaulted-parameter-order
• 0061-autoreleasepool-signature
• 0062-objc-keypaths
• 0063-swiftpm-system-module-search-paths
• 0064-property-selectors
• 0065-collections-move-indices
• 0066-standardize-function-type-syntax
• 0067-floating-point-protocols
• 0068-universal-self
• 0069-swift-mutability-for-foundation
• 0070-optional-requirements
• 0071-member-keywords
• 0072-eliminate-implicit-bridging-conversions
• 0073-noescape-once
• 0074-binary-search
• 0075-import-test
• 0076-copying-to-unsafe-mutable-pointer-with-unsafe-pointer-source
• 0077-operator-precedence
• 0078-rotate-algorithm
• 0079-upgrade-self-from-weak-to-strong
• 0080-failable-numeric-initializers
• 0081-move-where-expression
• 0082-swiftpm-package-edit
• 0083-remove-bridging-from-dynamic-casts
• 0084-trailing-commas
• 0085-package-manager-command-name
• 0086-drop-foundation-ns
• 0087-lazy-attribute
• 0088-libdispatch-for-swift3
• 0089-rename-string-reflection-init
• 0090-remove-dot-self
• 0091-improving-operators-in-protocols
• 0092-typealiases-in-protocols
• 0093-slice-base
• 0094-sequence-function
• 0095-any-as-existential
• 0096-dynamictype
• 0097-negative-attributes
• 0098-didset-capitalization
• 0099-conditionclauses
• 0100-add-sequence-based-init-and-merge-to-dictionary
• 0101-standardizing-sizeof-naming
• 0102-noreturn-bottom-type
• 0103-make-noescape-default
• 0104-improved-integers
• 0105-remove-where-from-forin-loops
• 0106-rename-osx-to-macos
• 0107-unsaferawpointer
• 0108-remove-assoctype-inference
• 0109-remove-boolean
• 0110-distinguish-single-tuple-arg
• 0111-remove-arg-label-type-significance
• 0112-nserror-bridging
• 0113-rounding-functions-on-floatingpoint
• 0114-buffer-naming
• 0115-literal-syntax-protocols
• 0116-id-as-any
• 0117-non-public-subclassable-by-default
• 0118-closure-parameter-names-and-labels
• 0119-extensions-access-modifiers
• 0120-revise-partition-method
• 0121-remove-optional-comparison-operators
• 0122-use-colons-for-subscript-type-declarations
• 0123-disallow-value-to-optional-coercion-in-operator-arguments
• 0124-bitpattern-label-for-int-initializer-objectidentfier
• 0125-remove-nonobjectivecbase
• 0126-refactor-metatypes-repurpose-t-dot-self-and-mirror
• 0127-cleaning-up-stdlib-ptr-buffer
• 0128-unicodescalar-failable-initializer
• 0129-package-manager-test-naming-conventions
• 0130-string-initializers-cleanup
• 0131-anyhashable
• 0132-sequence-end-ops
• 0133-rename-flatten-to-joined
• 0134-rename-string-properties
• 0135-package-manager-support-for-differentiating-packages-by-swift-version
• 0136-memory-layout-of-values
• 0137-avoiding-lock-in
• 0138-unsaferawbufferpointer
• 0139-bridge-nsnumber-and-nsvalue
• 0140-bridge-optional-to-nsnull
• 0141-available-by-swift-version
• 0142-associated-types-constraints
• 0143-conditional-conformances
• 0144-allow-single-dollar-sign-as-valid-identifier
• 0145-package-manager-version-pinning
• 0146-package-manager-product-definitions
• 0147-move-unsafe-initialize-from
• 0148-generic-subscripts
• 0149-package-manager-top-of-tree
• 0150-package-manager-branch-support
• 0151-package-manager-swift-language-compatibility-version
• 0152-package-manager-tools-version
• 0153-compensate-for-the-inconsistency-of-nscopyings-behaviour
• 0154-dictionary-key-and-value-collections
• 0155-normalize-enum-case-representation
• 0156-subclass-existentials
• 0157-recursive-protocol-constraints
• 0158-package-manager-manifest-api-redesign
• 0159-fix-private-access-levels
• 0160-objc-inference
• 0161-key-paths
• 0162-package-manager-custom-target-layouts
• 0163-string-revision-1
• 0164-remove-final-support-in-protocol-extensions
• 0165-dict
• 0166-swift-archival-serialization
• 0167-swift-encoders
• 0168-multi-line-string-literals
• 0169-improve-interaction-between-private-declarations-and-extensions
• 0170-nsnumber_bridge
• 0171-reduce-with-inout
• 0172-one-sided-ranges
• 0173-swap-indices
• 0174-filter-range-replaceable
• 0175-package-manager-revised-dependency-resolution
• 0176-enforce-exclusive-access-to-memory
• 0177-add-clamped-to-method
• 0178-character-unicode-view
• 0179-swift-run-command
• 0180-string-index-overhaul
• 0181-package-manager-cpp-language-version
• 0182-newline-escape-in-strings
• 0183-substring-affordances
• 0184-unsafe-pointers-add-missing
• 0185-synthesize-equatable-hashable
• 0186-remove-ownership-keyword-support-in-protocols
• 0187-introduce-filtermap
• 0188-stdlib-index-types-hashable
• 0189-restrict-cross-module-struct-initializers
• 0190-target-environment-platform-condition
• 0191-eliminate-indexdistance
• 0192-non-exhaustive-enums
• 0193-cross-module-inlining-and-specialization
• 0194-derived-collection-of-enum-cases
• 0195-dynamic-member-lookup
• 0196-diagnostic-directives
• 0197-remove-where
• 0198-playground-quicklook-api-revamp
• 0199-bool-toggle
• 0200-raw-string-escaping
• 0201-package-manager-local-dependencies
• 0202-random-unification
• 0203-rename-sequence-elements-equal
• 0204-add-last-methods
• 0205-withUnsafePointer-for-lets
• 0206-hashable-enhancements
• 0207-containsOnly
• 0208-package-manager-system-library-targets
• 0209-package-manager-swift-lang-version-update
• 0210-key-path-offset
• 0211-unicode-scalar-properties
• 0212-compiler-version-directive
• 0213-literal-init-via-coercion
• 0214-DictionaryLiteral
• 0215-conform-never-to-hashable-and-equatable
• 0216-dynamic-callable
• 0217-bangbang
• 0218-introduce-compact-map-values
• 0219-package-manager-dependency-mirroring
• 0220-count-where
• 0221-character-properties
• 0222-lazy-compactmap-sequence
• 0223-array-uninitialized-initializer
• 0224-ifswift-lessthan-operator
• 0225-binaryinteger-iseven-isodd-ismultiple
• 0226-package-manager-target-based-dep-resolution
• 0227-identity-keypath
• 0228-fix-expressiblebystringinterpolation
• 0229-simd
• 0230-flatten-optional-try
• 0231-optional-iteration
• 0232-remove-customization-points
• 0233-additive-arithmetic-protocol
• 0234-remove-sequence-subsequence
• 0235-add-result
• 0236-package-manager-platform-deployment-settings
• 0237-contiguous-collection
• 0238-package-manager-build-settings
• 0239-codable-range
• 0240-ordered-collection-diffing
• 0241-string-index-explicit-encoding-offset
• 0242-default-values-memberwise
• 0243-codepoint-and-character-literals
• 0244-opaque-result-types
• 0245-array-uninitialized-initializer
• 0246-mathable
• 0247-contiguous-strings
• 0248-string-gaps-missing-apis
• 0249-key-path-literal-function-expressions
• 0250-swift-style-guide-and-formatter
• 0251-simd-additions
• 0252-keypath-dynamic-member-lookup
• 0253-callable
• 0254-static-subscripts
• 0255-omit-return
• 0256-contiguous-collection
• 0257-elide-comma
• 0258-property-wrappers
• 0259-approximately-equal
• 0260-library-evolution
• 0261-identifiable
• 0262-demangle
• 0263-string-uninitialized-initializer
• 0264-stdlib-preview-package
• 0265-offset-indexing-and-slicing
• 0266-synthesized-comparable-for-enumerations
• 0267-where-on-contextually-generic
• 0268-didset-semantics
• 0269-implicit-self-explicit-capture
• 0270-rangeset-and-collection-operations
• 0271-package-manager-resources
• 0272-swiftpm-binary-dependencies
• 0273-swiftpm-conditional-target-dependencies
• 0274-magic-file
• 0275-allow-more-characters-like-whitespaces-and-punctuations-for-escaped-identifiers
• 0276-multi-pattern-catch-clauses
• 0277-float16
• 0278-package-manager-localized-resources
• 0279-multiple-trailing-closures
• 0280-enum-cases-as-protocol-witnesses
• 0281-main-attribute
• 0282-atomics
• 0283-tuples-are-equatable-comparable-hashable
• 0284-multiple-variadic-parameters
• 0285-ease-pound-file-transition
• 0286-forward-scan-trailing-closures
• 0287-implicit-member-chains
• 0288-binaryinteger-ispower
• 0289-result-builders
• 0290-negative-availability
• 0291-package-collections
• 0292-package-registry-service
• 0293-extend-property-wrappers-to-function-and-closure-parameters
• 0294-package-executable-targets
• 0295-codable-synthesis-for-enums-with-associated-values
• 0296-async-await
• 0297-concurrency-objc
• 0298-asyncsequence
• 0299-extend-generic-static-member-lookup
• 0300-continuation
• 0301-package-editing-commands
• 0302-concurrent-value-and-concurrent-closures
• 0303-swiftpm-extensible-build-tools
• 0304-structured-concurrency
• 0305-swiftpm-binary-target-improvements
• 0306-actors
• 0307-allow-interchangeable-use-of-double-cgfloat-types
• 0308-postfix-if-config-expressions
• 0309-unlock-existential-types-for-all-protocols
• 0310-effectful-readonly-properties
• 0311-task-locals
• 0312-indexed-and-enumerated-zip-collections
• 0313-actor-isolation-control
• 0314-async-stream
• 0315-placeholder-types
• 0316-global-actors
• 0317-async-let
• 0318-package-creation
• 0319-never-identifiable
• 0320-codingkeyrepresentable
• 0321-package-registry-publish
• 0322-temporary-buffers
• 0323-async-main-semantics
• 0324-c-lang-pointer-arg-conversion
• 0325-swiftpm-additional-plugin-apis
• 0326-extending-multi-statement-closure-inference
• 0327-actor-initializers
• 0328-structural-opaque-result-types
• 0329-clock-instant-duration
• 0330-collection-conditionals
• 0331-remove-sendable-from-unsafepointer
• 0332-swiftpm-command-plugins
• 0333-with-memory-rebound
• 0334-pointer-usability-improvements
• 0335-existential-any
• 0336-distributed-actor-isolation
• 0337-support-incremental-migration-to-concurrency-checking
• 0338-clarify-execution-non-actor-async
• 0339-module-aliasing-for-disambiguation
• 0340-swift-noasync
• 0341-opaque-parameters
• 0342-static-link-runtime-libraries-by-default-on-supported-platforms
• 0343-top-level-concurrency
• 0344-distributed-actor-runtime
• 0345-if-let-shorthand
• 0346-light-weight-same-type-syntax
• 0347-type-inference-from-default-exprs
• 0348-buildpartialblock
• 0349-unaligned-loads-and-stores
• 0350-regex-type-overview
• 0351-regex-builder
• 0352-implicit-open-existentials
• 0353-constrained-existential-types
• 0354-regex-literals
• 0355-regex-syntax-run-time-construction
• 0356-swift-snippets
• 0357-regex-string-processing-algorithms
• 0358-primary-associated-types-in-stdlib
• 0359-build-time-constant-values
• 0360-opaque-result-types-with-availability
• 0361-bound-generic-extensions
• 0362-piecemeal-future-features
• 0363-unicode-for-string-processing
• 0364-retroactive-conformance-warning
• 0365-implicit-self-weak-capture
• 0366-move-function
• 0367-conditional-attributes
• 0368-staticbigint
• 0369-add-customdebugdescription-conformance-to-anykeypath
• 0370-pointer-family-initialization-improvements
• 0371-isolated-synchronous-deinit
• 0372-document-sorting-as-stable
• 0373-vars-without-limits-in-result-builders
• 0374-clock-sleep-for
• 0375-opening-existential-optional
• 0376-function-back-deployment
• 0377-parameter-ownership-modifiers
• 0378-package-registry-auth
• 0379-opt-in-reflection-metadata
• 0380-if-switch-expressions
• 0381-task-group-discard-results
• 0382-expression-macros
• 0383-deprecate-uiapplicationmain-and-nsapplicationmain
• 0384-importing-forward-declared-objc-interfaces-and-protocols
• 0385-custom-reflection-metadata
• 0386-package-access-modifier
• 0387-cross-compilation-destinations
• 0388-async-stream-factory
• 0389-attached-macros
• 0390-noncopyable-structs-and-enums
• 0391-package-registry-publish
• 0392-custom-actor-executors
• 0393-parameter-packs
• 0394-swiftpm-expression-macros
• 0395-observability
• 0396-never-codable
• 0397-freestanding-declaration-macros
• 0398-variadic-types
• 0399-tuple-of-value-pack-expansion
• 0400-init-accessors
• 0401-remove-property-wrapper-isolation
• 0402-extension-macros
• 0403-swiftpm-mixed-language-targets
• 0404-nested-protocols
• 0405-string-validating-initializers
• 0406-async-stream-backpressure
• 0407-member-macro-conformances
• 0408-pack-iteration
• 0409-access-level-on-imports
• 0410-atomics
• 0411-isolated-default-values
• 0412-strict-concurrency-for-global-variables
• 0413-typed-throws
• 0414-region-based-isolation
• 0415-function-body-macros
• 0416-keypath-function-subtyping
• 0417-task-executor-preference
• 0418-inferring-sendable-for-methods
• 0419-backtrace-api
• 0420-inheritance-of-actor-isolation
• 0421-generalize-async-sequence
• 0422-caller-side-default-argument-macro-expression
• 0423-dynamic-actor-isolation
• 0424-custom-isolation-checking-for-serialexecutor
• 0425-int128
• 0426-bitwise-copyable
• 0427-noncopyable-generics
• 0428-resolve-distributed-actor-protocols
• 0429-partial-consumption
• 0430-transferring-parameters-and-results
• 0431-isolated-any-functions
• 0432-noncopyable-switch
• 0433-mutex
• 0434-global-actor-isolated-types-usability
• 0435-swiftpm-per-target-swift-language-version-setting
• 0436-objc-implementation
• 0437-noncopyable-stdlib-primitives
• 0438-metatype-keypath
• 0439-trailing-comma-lists
• 0440-debug-description-macro
• 0441-formalize-language-mode-terminology
• 0442-allow-taskgroup-childtaskresult-type-to-be-inferred
• 0443-warning-control-flags
• 0444-member-import-visibility
• 0445-string-index-printing
• 0446-non-escapable
• 0447-span-access-shared-contiguous-storage
• 0448-regex-lookbehind-assertions
• 0449-nonisolated-for-global-actor-cutoff
• 0450-swiftpm-package-traits
• 0451-escaped-identifiers
• 0452-integer-generic-parameters
• 0453-vector
• 0454-memory-allocator
• 0455-swiftpm-testable-build-setting
• 0456-stdlib-span-properties
• 0457-duration-attosecond-represenation
• 0458-strict-memory-safety
• 0459-enumerated-collection
• 0460-specialized
• 0461-async-function-isolation
• 0462-task-priority-escalation-apis
• 0463-sendable-completion-handlers
• 0464-utf8span-safe-utf8-processing
• 0465-nonescapable-stdlib-primitives
• 0466-control-default-actor-isolation
• 0467-MutableSpan
• 0468-async-stream-continuation-hashable-conformance
• 0469-task-names
• 0470-isolated-conformances
• 0471-SerialExecutor-isIsolated
• 0472-task-start-synchronously-on-caller-context
• 0473-clock-epochs
• 0474-yielding-accessors
• 0475-observed
• 0476-abi-attr
• 0477-default-interpolation-values
• 0478-default-isolation-typealias
• 0479-method-and-initializer-keypaths
• 0480-swiftpm-warning-control
• 0481-weak-let
• 0482-swiftpm-static-library-binary-target-non-apple-platforms
• 0483-inline-array-sugar
• 0484-allow-additional-args-to-dynamicmemberlookup-subscripts
• 0485-outputspan
• 0486-adoption-tooling-for-swift-features
• 0487-extensible-enums
• 0488-extracting
• 0489-codable-error-printing
• 0490-environment-constrained-shared-libraries
• 0491-module-selectors
• 0492-section-control
• 0493-defer-async
• 0494-add-is-identical-methods
• 0495-cdecl
• 0496-inline-always
• 0497-definition-visibility
• 0498-runtime-demangle
• 0499-support-non-copyable-simple-protocols
• 0500-package-manager-templates
• 0501-swiftpm-html-coverage-report
• 0502-exclude-private-from-memberwise-init
• 0503-suppressed-associated-types
• 0504-task-cancellation-shields
• 0505-delayed-enqueuing
• 0506-advanced-observation-tracking
• 0507-borrow-accessors
• 0508-array-expression-trailing-closures
• 0509-swift-sboms-via-swiftpm
• 0510-dictionary-mapvalues-with-keys
• 0511-swiftpm-add-target-plugin
• 0512-withlockifavailable-cannot-spuriously-fail
• 0513-commandline-executablepath
• 0514-hashable-conformance-for-dictionarykeys-collectionofone-emptycollection
• 0515-noncopyable-reduce
• 0516-borrowing-sequence
• 0517-uniquebox
• 0518-tilde-sendable
• 0519-borrow-inout-types
• 0519-ref-mutableref-types
• 0520-discardableresult-task-initializers
• 0521-improved-optional-opaque-and-any
• 0522-source-warning-control
• 0523-hashable-unownedtask-executor
• 0524-span-temporary-allocation
• 0525-rawspan-safe-loading-api
• 0526-deadline
• 0527-rigidarray-uniquearray
• 0528-noncopyable-continuation
• 0529-filepath-in-stdlib
• 0530-async-result-support
• 0531-literal-expressions
• 0532-optional-noncopyable-improvements