Unlabeled

32 bit only

accepts invalid

Bug: Accepts invalid

access control

Feature → modifiers: Access control and access levels

access exclusivity

Feature: Enforcement of exclusive access to memory

accessors

Feature → declarations: Variable (property) accessors

actor isolation

Feature → concurrency: Actor isolation

actor

Feature → concurrency: `actor` declarations

affects ABI

Flag: Affects ABI

Android

Platform: Android

AnyKeyPath

Area → standard library: The `AnyKeyPath` type

ARC

Feature: automatic reference counting

argument labels

Feature: function argument labels

arm

Architecture: any ARM

arm64

Architecture: arm64 (aarch64) — any 64-bit ARM

armhf

Architecture: the Debian port for ARM processors (armv7+) that have hardware floating point support

armv7

Architecture: ARMv7

armv8

Architecture: ARMv8

array literals

Feature → expressions → literals: Array literals

Array

Area → standard library: The `Array` type

assertion failure

Bug → crash: An assertion failure

assignments

Feature → expressions: assignments

associated type inference

associated values

Feature → enums: enum cases with associated values (payload)

associatedtype

Feature → declarations → protocol: `associatedtype` declarations

AST

Area → compiler: The libSwiftAST library

ASTDumper

Area → compiler: The AST debug format printer

ASTGen

Area → compiler: The ASTGen module, which translates SwiftSyntax trees to the C++ AST

ASTPrinter

Area → compiler: The AST printer

async & await

Feature → concurrency: asynchronous function aka the async/await pattern

attributes

Feature: Declaration and type attributes

@autoclosure

Feature → attributes: the @autoclosure type attribute

AutoDiff

autolinking

availability

The @available attribute and availability checking in general

#available

Feature → statements: Availability condition

backticked identifiers

Feature → identifiers: Backticked identifiers. Allows using reserved words as identifiers

benchmarks

BidirectionalCollection

Area → standard library: The `BidirectionalCollection` protocol

binding patterns

Feature → patterns: Binding patterns

bitcode

bootstrapping

Area → utils → build-script: Bootstrapping schemes

bridging

Feature → casting: type bridging

bug

A deviation from expected or documented behavior. Also: expected but undesirable behavior.

build error

Errors when building the toolchain, not regular Swift code

build

build-script

Area → utils: The build script

c/c++ macros

c interop

Feature: Interoperability with C

c++ interop

Feature: Interoperability with C++

c++ to swift

Feature → c++ interop: c++ to swift

call expressions

Feature → expressions: Call expressions

cant repro

Resolution → bug: Cannot reproduce due to incomplete or inaccessible test case

capture lists

Feature → closures: Closure capture lists

casting

Feature: explicit casting (is, as, as? and as!)

@_cdecl

Feature → attributes: The @_cdecl attribute

changelog

The CHANGELOG.md file

Character

Area → standard library: The `Character` type

CharacterSet

circular reference

Bug → internal error: Circular reference

clang importer

Area → compiler: The clang importer

class

Feature → type declarations: Class declarations

cloned

Resolution: Was resubmitted in the appropriate repository rather than transferred

closures

Feature: closures

cmake

Codable

Area → standard library: `Codable` and co.

code completion

Area → source tooling: code completion

code coverage

Area → source tooling: code coverage

code health

code size

CodeGen

Collection

Area → standard library: The `Collection` protocol

comments

Feature: comments

compiler control statements

Feature: compiler control statements

compiler

The Swift compiler itself

Concurrencу

Area → standard library: The `Concurrency` module under the standard library umbrella

concurrency runtime

Feature: umbrella label for concurrency runtime features

concurrency

Feature: umbrella label for concurrency language features

conditional conformances

Feature → protocol → conformances: conditional conformances

conformances

Feature → protocol: protocol conformances

constexpr

Feature → c++ interop: constexpr

constrained existentials

Feature → existentials: constrained existentials such as 'any Collection<Int>'

continuous integration

contributor experience

control transfer statements

Feature → statements: control transfer statements

convenience init

Feature → declarations → init: Convenience initializers

@convention

Feature → attributes: the @convention attribute

COW

Feature: Copy-On-Write support

crash

Bug: A crash, i.e., an abnormal termination of software

cross module optimization

Flag: Cross-module optimization

cross-compilation

Area → utils: Cross-compilation of project sources

CSE

Area → compiler → SILOptimizer: Common Subexpression Elimination

cursor info

Area → source tooling: cursor info

CustomDebugStringConvertible

Area → standard library: The `CustomDebugStringConvertible` protocol

CustomStringConvertible

Area → standard library: The `CustomStringConvertible` protocol

Cxx

Area → standard library: The `Cxx` module

Cygwin

Darwin

DCE

Area → compiler → SILOptimizer: Dead Code Elimination

debug info

Area → compiler → IRGen: Debug information emission

declarations

Feature: declarations

default arguments

Feature: default arguments for value parameters

default implementations

Feature → protocol → conformances: default implementations

default initialization

Feature: Default initialization of variables

definite initialization

Area → compiler → SIL: Definite initialization

deinit

Feature: deinitializers

demangling

Area → compiler: The `libswiftDemangling` library

derived conformances

Feature → protocol → conformances: derived conformances aka synthesized conformances

development tools

Area: tools for compiler developers under the 'tools' directory

diagnostic engine

Area → compiler → AST: The `DiagnosticEngine` class

diagnostic printer

Area → compiler: diagnostic printer

diagnostic verifier

Area → compiler → Frontend: The `DiagnosticVerifier` class

diagnostics QoI

Bug: Diagnostics Quality of Implementation

Dictionary

Area → standard library: the `Dictionary` type

disambiguation

Bug: disambiguation

@discardableResult

Feature → attributes: The @discardableResult attribute

Dispatch

distributed

Feature → concurrency: distributed actor

do catch

Feature → statements: 'do' statements

do not merge

docker

Flag: Swift installation via Docker

document structure

Area → source tooling: document structure annotation

@_documentation

Feature → attributes: the @_documentation attribute

documentation

Double

Area → standard library: The `Double` type

driver options

Area → compiler → legacy driver: driver options

driver

#dsohandle

Area → standard library: The `dsohandle` macro

duplicate

Resolution: Duplicates another issue

@dynamicMemberLookup

Feature → attributes: the @dynamicMemberLookup attribute

@_dynamicReplacement

Feature → attributes: the @_dynamicReplacement attribute

embedded

Embedded Swift

enum case patterns

Feature → patterns: Enumeration case patterns

enum cases

Feature → enums: Enum cases

enum

Feature → type declarations: Swift enumeration declarations

Equatable

Area → standard library: The `Equatable` protocol

error handling

exclusivity

existential member accesses

Feature → existentials: existential member accesses

existentials

Feature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased values

@_exported

Feature → attributes: the @_exported attribute

expressions

Feature: expressions

extension

Feature → declarations: `extension` declarations

#externalMacro

Feature → swift macro: The built-in `#externalMacro` macro

failed to produce diagnostic

Bug → internal error: Failed to produce diagnostic for expression

feature exists

Resolution → feature: Feature already exists

feature

A feature request or implementation

Fedora

Platform: Fedora

fix-its

Feature: diagnostic fix-its

for-in loops

Feature: for-in loops

force-value

Feature → expressions: Force-value aka force-unwrap expression

format

found by asan

Flag: An issue found by the Address Sanitizer

found by stress tester

Flag: An issue found by the SourceKit stress tester

found by tsan

Flag: An issue found by the Thread Sanitizer

Foundation

FreeBSD

Platform: FreeBSD

Frontend

Area → compiler: Frontend

func

Feature → declarations: Functions

function parameters

Feature → declarations: function parameters

function references

Feature: function references as in 'foo(bar:baz:)'

function types

Feature → types: function types

function values

Feature → expressions: function values

gardening

generated Xcode project

generic constraints

Feature → generics: generic constraints

generic where clauses

Feature → generics: generic where clauses

generics

Feature: generic declarations and types

global let & var

Feature: global constants and variables

good first issue

Good for newcomers

GPE

gyb

Generate Your Boilerplate python utility

hang

Bug: Execution is not seen to halt

Hashable

Area → standard library: The `Hashable` protocol

help wanted

ICU

identifiers

Feature: Identifiers

if else

Feature → statements: 'if' statements

#if

Feature → compiler control statements: Conditional compilation blocks

implicit conversions

Feature: implicit conversions

implicit existential opening

Feature → existentials: implicit opening of existentials when passed to parameters of generic type

implicit member expressions

Feature → expressions: Implicit member expressions

implicitly unwrapped optionals

Feature → types: Implicitly unwrapped optional types, aka IUO

import

Feature → declarations: `import` declarations

improvement

in-out expressions

Feature → expressions: In-out expressions

inaccurate info

Bug → documentation: Inaccurate info

incremental compilation

indexing

Area → source tooling: AST indexing

infinite recursion

Bug: Infinite recursion

inheritance clauses

Feature → type declarations: Type inheritance clauses

inheritance

Feature → type declarations → class: Subclassing and inheritance of class members

init accessors

Feature: Initialization property accessors

init

Feature → declarations: Initializers

@inlinable

Feature → attributes: the @inlinable attribute

inout

Feature → types: `inout` types

input & output

Area → standard library: Input & output

integer literals

Feature → literals: Integer literals

internal error

Bug: Internal error

interpolated strings

Feature → expressions → literals → string literals: interpolated strings

invalid

Resolution: Invalid (spam, junk or empty)

IRGen

LLVM IR generation

JIT

jupyter

key paths

Feature: key paths (both native and Objective-C)

lazy var

Feature: Lazy variables

legacy driver

Area → compiler: the integrated C++ legacy driver. Succeeded by the swift-driver project

let & var

Feature: constant and variable declarations

lexer

Area → compiler: The legacy C++ lexer

library evolution

Feature: library evolution (umbrella feature for features that facilitate resilient libraries)

† libswiftSyntax

† Area → compiler: the once-integrated C++ Syntax library succeeded by SwiftSyntax

linker error

Linux

Platform: Linux

literals

Feature → expressions: Literals such as an integer or string literal

lldb

Mac Catalyst

Platform: Mac Catalyst

macOS

Platform: macOS

macro expansions

Feature → expressions: Macro expansion expressions

@main

Feature → attributes: the @main attribute

mangling

Area → compiler: Mangling

manual memory management

Area → standard library: Manual memory management APIs

member expressions

Feature → expressions: Member expressions

memberwise init

Feature: Memberwise structure initializers

memory corruption

memory leak

bug: Memory leak

memory safety

Feature: memory safety

metatypes

Feature → types: Metatypes

methods

Feature → functions: methods (member functions)

migrator

mips

Architecture: MIPS

missing info

Resolution: Is missing crucial info such as a test case or a concise description

missing warning

Bug: Missing warning

modifiers

Feature: Declaration and type modifiers

module maps

move-only

Feature → type declarations: Move-only type declarations

multi-statement closures

Feature → closures: multi-statement closures

multiline string literals

Feature → expressions → literals → string literals: multiline string literals

multiple files

Flag: An issue whose reproduction requires multiple files

multiple modules

Flag: An issue whose reproduction requires multiple modules

mutability

Feature: storage mutability

mutating

Feature → declarations → functions: Mutating functions

name lookup

Area → compiler → type checker: Name lookup

name shadowing

Feature: name shadowing

needs tests

Flag: Issue is fixed but needs tests / PR needs tests

nested functions

Features → declarations: nested functions

nested types

Feature: nested types

Never

Area → standard library: The `Never` type

new feature

newfuzz

nfc

Flag: No Functional Change

nil

Feature → expressions → literals: The `nil` literal

nil-coalescing operator

Feature → operators: The nil-coalescing operator `??`

@_noLocks

Feature → attributes: The @_noLocks attribute

non-optimized only

Flag: An issue whose reproduction requires non-optimized compilation

noncopyable struct/enum

Feature → declarations: Noncopyable value type declarations

not a bug

Resolution → not a bug: Reported as a bug but turned out to be expected behavior or programmer error

numerics

Area → standard library: Numeric API

@objc

Feature → attributes: The @objc attribute

objective-c interop

Feature: Interoperability with Objective-C

Observation

Area → standard library: The `Observation` module under the standard library umbrella

observers

Feature → accessors: Stored variable (property) observers (`willSet`, `didSet`)

off topic

Resolution: Is beyond the scope of the Swift project (Xcode, proprietary Apple frameworks, etc.)

opaque parameter types

Feature → types → opaque types: opaque parameter types

opaque result types

Feature → types → opaque types: opaque result types

opaque types

Feature → types: opaque types

_openExistential

Area → standard library: The `_openExistential` intrinsic

openSUSE

Platform: openSUSE

operators

Feature: operators

optimized only

Flag: An issue whose reproduction requires optimized compilation

optional binding

Feature → patterns: optional binding

optional chaining

Feature → expressions: optional chaining

optional protocol requirements

Feature → protocol: optional protocol requirements

Optional

Area → standard library: The `Optional` type

OptionSet

Area → standard library: The `OptionSet` protocol

overload resolution

Area → compiler → type checker: Overload resolution (ranking)

overloading

Feature: Overloading symbol names

override

Feature: Overriding in classes

ownership

Feature: Ownership modifiers and semantics

pack expansions

Feature → expressions: Pack expansion expressions

pack iteration

Feature → statements → for-in: Pack iteration

parameter packs

Feature → generics: Parameter packs

parameterized protocols

Feature → protocol: protocols with primary associated types

parsable output

Area → compiler → legacy driver: parsable output

parser

Area → compiler: The legacy C++ parser

ParseStdlibOnly

pattern matching

Feature: pattern matching

pattern where clauses

Feature → patterns: Pattern `where` clauses

patterns

Feature: patterns

pending approval

pending convergence

performance

placeholder types

Feature → types: placeholder types

platform support

playground transform

Area → compiler → type checker: The Xcode playground transform

potentially source breaking

ppc

Architecture: any PowerPC

ppc32

Architecture: 32-bit PowerPC

ppc64le

Architecture: 64-bit little-endian PowerPC

precedence groups

Feature → operators: precedence groups

@preconcurrency

Feature → attributes: The @preconcurrency attribute

PrintAsClang

Area → compiler: The PrintAsClang library

properties

Feature: properties

property wrapper compositions

Feature → property wrappers: Compositions

property wrappers

Feature: property wrappers

protocol compositions

Feature → types: protocol composition types

protocol

Feature → type declarations: Protocol declarations

python

Flag: Python source code

QoI

Quality of Implementation

qualified identifier types

Feature → types: Qualified identifier types

question

Resolution: A on-topic question that we prefer asked via the Swift forums

raw string literals

Feature → expressions → literals → string literals: Raw string literals

raw values

Feature → enums → enum cases: Inline raw values

raw-value types

Feature → declarations → enum: A raw-value type of an enumeration

refactoring

Area → source tooling: refactoring

reference ownership

Feature → modifiers: Reference storage ownership modifiers

reflection

regex literals

Feature → expressions → literals: regex literals

regression

🍒 release cherry pick

Flag: Release branch cherry picks

REPL

result builders

Feature: Result builders

@retroactive

Feature → attributes: The @retroactive attribute

return

Feature → statements: `return` statements

riscv

Architecture: RISC-V

run-test

Area → utils: the `run-test` script

run-time crash

Bug → crash: Swift code crashed during execution

run-time performance

runtime

The Swift Runtime

s4tf iris tutorial

script mode

Flag: Specific to script mode compilation

SDKOverlay

selectors

Feature: Objective-C selectors in Swift (#selector)

self captures

Feature → closures: 'self' captures

Self in class

Feature → types: The 'Self' type in classes

Self in protocol

Feature → types: The 'Self' type in protocols

Self in struct & enum

Feature → types: The 'Self' type in structures and enumerations

self

Feature → expressions: The 'self' expression

Sendable

Area → standard library: The Sendable protocol

Sequence

Area → standard library: The `Sequence` protocol

serialization

Area → compiler: Serialization & deserialization

SIL ownership

Area → compiler → SIL: SIL ownership

SIL

SILGen

Area → compiler: The SIL generation stage

SILOptimizedDebugInfo

SILOptimizer

Area → compiler: SIL optimization passes

SILParser

Area → compiler: The SIL parser

SILSerialization

simd

source compatibility suite

Flag: An issue that surfaced in the source compatibility suite

source compatibility

source tooling

Area: IDE support, SourceKit, and other source tooling

SourceKit

Area → source tooling: SourceKit

#sourceLocation

Feature → compiler control statements: Line control statements

@_spi

Feature → attributes: the @_spi attribute

sswg

Issues related to Serverside Swift Work Group projects

stale

Resolution: No longer relevant, stale

standard library

Area: Standard library umbrella

statements

Feature: statements

static declarations

Feature → declarations: Static declarations

static libraries

static stdlib

StdlibUnittest

SteamOS

Platform: SteamOS

string literals

Feature → expressions → literals: String literals

String

Area → standard library: The `String` type

struct

Feature → type declarations: Structure declarations

subscript expressions

Feature → expressions: Subscript expressions

subscript

Feature: Subscript declarations

sugared types

Feature: sugared types, e.g. 'Int?' or '[Int]'

swift evolution approved

Flag → feature: A feature that was approved through the Swift evolution process

swift evolution implemented

Flag → feature: A feature that was approved through the Swift evolution process and implemented

swift evolution pending discussion

Flag → feature: A feature that has a Swift evolution proposal currently in review

swift evolution proposal needed

Flag → feature: A feature that warrants a Swift evolution proposal

swift evolution rejected

Flag → feature: A feature that was rejected through the Swift evolution process

swift for tensorflow

swift macro

Feature → declarations: Swift `macro` declarations

swift to c++

Feature → c++ interop: swift to c++

swift 2.2

swift 2.3

swift 3.0

swift 3.1

swift 4.0

swift 4.1

swift 4.2

swift 5.0

swift 5.1

swift 5.2

swift 5.3

swift 5.4

swift 5.5

swift 5.6

swift 5.7

swift 5.8

swift 5.9

swift 5.10

swift 6.0

swift 6.1

swift-autolink-extract

Area → compiler → legacy driver: the 'swift-autolink-extract' mode

swift-symbolgraph-extract

Area → compiler → legacy driver: the 'swift-symbolgraph-extract' mode

swift-xcodegen

Area → utils: swift-xcodegen

SwiftIntegrationTests

SwiftUI

Flag: Involves SwiftUI

switch cases

Feature → statements → switch: 'switch' statement cases

switch exhaustivity

Feature: enforcement of exhaustivity in 'switch' statements

switch

Feature → statements: 'switch' statements

SymbolGraphGen

The swiftSymbolGraphGen library, responsible for gathering and emitting symbol graphs.

syntax coloring

Area → source tooling: syntax coloring

Tаsk

Area → standard library → Concurrency: The `Task` type

task

TaskGroup

Area → standard library → Concurrency: The `TaskGroup` type

TBDGen

Area → compiler: TBD generation

tensorflow

This is for "tensorflow" branch PRs.

ternary operator

Feature → operators: The ternary operator

test failure

test suite

Area: test suite

textual interfaces

throw

Feature → error handling: Throw statements

throws & rethrows

Feature → error handling: throws & rethrows

time

Area → standard library → Concurrency: Time APIs

toolchain

trailing closures

Feature: trailing closures

transfer candidate

The issue may belong in another repository

triage needed

This issue needs more specific labels

TSan

For issues in the Thread Sanitizer itself

tuple destructuring

Feature: tuple destructuring

tuple patterns

Feature → patterns: Tuple patterns

tuple types

Feature → types: Tuple types

tuples

Feature: tuples

type checker

Area → compiler: Semantic analysis

type declarations

Feature → declarations: Type declarations

type inference

Feature: type inference

typealias

Feature → type declarations: `typealias` declarations

typed throws

Feature → error handling → throws & rethrows: Typed throws

TypeResolver

types

Feature: types

typo

A typographical error in text or non-executable code

UIKit

Flag: Involves UIKit

☂️ umbrella issue

Flag: An umbrella issue

@unchecked

Feature → attributes: The @unchecked attribute

unexpected behavior

Bug: Unexpected behavior or incorrect output

unexpected error

Bug: Unexpected error

unexpected warning

Bug: Unexpected warning

Unicode

Area → standard library: Unicode processing APIs

unit tests

Unmanaged

Area → standard library: The `Unmanaged` type

update-checkout

Area → utils: the `update-checkout` script

@usableFromInline

Feature → attributes: The @usableFromInline attribute

utils

Area: the build system and other accessory scripts under the "utils" directory

value capturing

Feature: Value capturing by closures and local functions

variadic parameters

Feature → declarations → function parameters: Variadic function parameters

verifier

WASI

WebAssembly System Interface support

weak

Feature → modifiers → reference ownership: Weak

WebAssembly

Platform: WebAssembly

† website

This issue was supposed to belong in the swift-org-website repository

whole module optimization only

Flag: An issue whose reproduction requires whole module optimization

whole module optimization

Feature: Whole module optimization

wildcard pattern

Feature → patterns: The wildcard (underscore) pattern

will not do

Resolution: Will not be worked on

Windows

Platform: Windows

withdrawn

Resolution: the issue was withdrawn by the author due to not being relevant

x86_64

Architecture: x86_64

xcframework

Xcode

Flag: Involves Xcode

XCTest

Flag: Involves XCTest