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Contribute to swiftlang/swift

Make your first contribution to this repository by tackling one of the issues listed below.

Each issue displayed here is a "good first issue," selected for its relative approachability for first-time contributors.

Good first issues

5.10 "LoadableByAddress" non-deterministic compiler crash when parameter pack closure saved to instance property. bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers IRGen LLVM IR generation generics Feature: generic declarations and types crash Bug: A crash, i.e., an abnormal termination of software function types Feature → types: function types properties Feature: properties parameter packs Feature → generics: Parameter packs types Feature: types swift 5.10 needs tests Flag: Issue is fixed but needs tests / PR needs tests
#74609 opened Jun 21, 2024 by vanvoorden
10
Variable i was never mutated in `.enumerated()` for var loop; needs fix-it to suggest `for case (let _, var _)` bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis fix-its Feature: diagnostic fix-its for-in loops Feature: for-in loops patterns Feature: patterns statements Feature: statements swift 6.0 tuple patterns Feature → patterns: Tuple patterns binding patterns Feature → patterns: Binding patterns
#72811 opened Apr 3, 2024 by peterkos
15
Bad diagnostic for `any P!` bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis TypeResolver existentials Feature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased values unexpected behavior Bug: Unexpected behavior or incorrect output types Feature: types swift 6.0 implicitly unwrapped optionals Feature → types: Implicitly unwrapped optional types, aka IUO
#72662 opened Mar 28, 2024 by AnthonyLatsis
6
Diagnostic for use of plain protocol name in type position should suggest `some` or `any` bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis fix-its Feature: diagnostic fix-its generics Feature: generic declarations and types opaque types Feature → types: opaque types existentials Feature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased values swift 5.9 types Feature: types
#68284 opened Sep 1, 2023 by hborla
16
Compiler error when extending a typealias of a partially specialized generic type bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers type checker Area → compiler: Semantic analysis generics Feature: generic declarations and types TypeResolver typealias Feature → type declarations: `typealias` declarations swift 5.9 unexpected error Bug: Unexpected error extension Feature → declarations: `extension` declarations declarations Feature: declarations
#68212 opened Aug 30, 2023 by tapsns
56
`[.]Type` completion for `(any P).` shows it will produce an existential metatype bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. good first issue Good for newcomers code completion Area → source tooling: code completion source tooling Area: IDE support, SourceKit, and other source tooling existentials Feature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased values metatypes Feature → types: Metatypes swift 5.9 unexpected behavior Bug: Unexpected behavior or incorrect output types Feature: types
#65843 opened May 10, 2023 by AnthonyLatsis
32
Code completion: Stop suggesting old-style protocol metatype syntax in Swift 6 mode bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. good first issue Good for newcomers code completion Area → source tooling: code completion source tooling Area: IDE support, SourceKit, and other source tooling existentials Feature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased values metatypes Feature → types: Metatypes swift 5.9 unexpected behavior Bug: Unexpected behavior or incorrect output types Feature: types
#65699 opened May 5, 2023 by AnthonyLatsis
9
Bad diagnostic when inheriting from class in extension bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis inheritance Feature → type declarations → class: Subclassing and inheritance of class members extension Feature → declarations: `extension` declarations swift 6.0
#64903 opened Apr 4, 2023 by AnthonyLatsis
13
Optional boolean doesn't satisfy switch exhaustivity with literal case statements improvement compiler The Swift compiler itself good first issue Good for newcomers feature A feature request or implementation type checker Area → compiler: Semantic analysis literals Feature → expressions: Literals such as an integer or string literal switch exhaustivity Feature: enforcement of exhaustivity in 'switch' statements switch Feature → statements: 'switch' statements
#61817 opened Oct 31, 2022 by jpsim
14
SwiftUI: Failed to produce diagnostic for expression when using keyword 'open' in some contexts bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis failed to produce diagnostic Bug → internal error: Failed to produce diagnostic for expression swift 5.9
#61039 opened Sep 11, 2022 by j-war
14
[SR-15111] “Type of expression is ambiguous” error when initializing a class bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis type inference Feature: type inference expressions Feature: expressions swift 5.9 optional chaining Feature → expressions: optional chaining
#57437 opened Aug 25, 2021 by swift-ci
13
[SR-8213] Compiler may indicate "case will never be executed" even if it is unavoidable to execute the case in switch statement. bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis SILGen Area → compiler: The SIL generation stage pattern matching Feature: pattern matching switch Feature → statements: 'switch' statements swift 5.9 patterns Feature: patterns statements Feature: statements switch cases Feature → statements → switch: 'switch' statement cases
#50745 opened Jul 10, 2018 by YOCKOW
14
[SR-6207] Misleading error for unqualified use of static variable in method bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis expressions Feature: expressions static declarations Feature → declarations: Static declarations swift 6.0
#48759 opened Oct 24, 2017 by huonw mannequin
7
[SR-3316] "Script mode" globals have internal visibility and can be accessed before initialization from other files bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers feature A feature request or implementation swift evolution proposal needed Flag → feature: A feature that warrants a Swift evolution proposal access control Feature → modifiers: Access control and access levels
#45904 opened Dec 2, 2016 by jckarter
1
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