swiftlang

swiftlang/swift

The Swift Programming Language

57 good first / help-wanted issues · Swift · last activity Jul 3, 2026

70.1K stars 10.8K forks 70.1K watchers Swift Apache License 2.0
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57 Open Issues Need Help Last updated: Jul 3, 2026

Open Issues Need Help

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Fill out unimplemented expression cases in the ASTPrinter 3 days ago
compiler good first issue ASTPrinter expressions
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-7230] Improve error message for statement that begins with open brace 3 days ago
bug compiler good first issue diagnostics quality
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Suboptimal diagnostics on mutating on immutable + optional value on non-optional parameter 16 days ago
compiler good first issue diagnostics quality type checker expressions mutating
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Compiler shouldn't suggest isolated conformance to SendableMetatype refining protocol 17 days ago
concurrency good first issue diagnostics quality conformances fix-its swift 6.5-dev
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-2117] Add documentation for SourceKit request types 22 days ago
improvement good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
`isolated` keyword incorrectly permitted in inheritance clause 2 months ago
concurrency compiler good first issue type checker accepts invalid actor isolation inheritance clauses
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-13388] Add Fix-Its to "override" mismatch 2 months ago
improvement compiler good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-3254] Unhelpful diagnostics for compound name reference. 3 months ago
bug compiler good first issue diagnostics quality type checker function references swift 6.0
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-5984] Error message for accidentally calling function in #selector(foo()) could suggest removing parens 3 months ago
bug compiler good first issue diagnostics quality type checker
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-7113] `try` on closures needs a clearer error message 3 months ago
bug compiler good first issue diagnostics quality
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-5362] StdlibUnittest allows redeclaration of the same-named test; ignores all but last 3 months ago
bug good first issue standard library
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-2961] utils/run-test should accept the same "optimization mode" flags build-script does 3 months ago
good first issue contributor experience utils run-test
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Error says `@preconcurrency` only applies in inheritance clauses 3 months ago
compiler good first issue diagnostics quality type checker TypeResolver attributes @preconcurrency swift 6.3
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-11905] Objective-C interop allows creation of undefined behavior 3 months ago
bug compiler good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-11418] Add Graph Algorithm benchmarks to test unowned, weak, and unmanaged 3 months ago
compiler good first issue standard library benchmarks
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-14941] Introduce compiler warning for leading-zero octal notation 3 months ago
improvement good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
global actor annotations can be applied to inheritance clauses 3 months ago
concurrency good first issue type checker accepts invalid attributes actor isolation inheritance clauses swift 6.3
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-12930] Add protocol extension to "Result where Success == Void" so that we can use .success() 3 months ago
improvement good first issue standard library swift evolution proposal needed
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-13903] Make `ApplyInst` a `MultipleValueInstruction` 3 months ago
improvement compiler good first issue SILOptimizer
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[Diagnostics] "inbetween" should be "in between" in 'sending' data-race diagnostics 3 months ago
good first issue diagnostics quality gardening
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Compiler error when extending a typealias of a partially specialized generic type 4 months ago
bug compiler good first issue type checker generics TypeResolver typealias swift 5.9 unexpected error extension declarations
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-10667] Optimise chained SubSequence producing methods into fewer calls 4 months ago
performance improvement compiler good first issue SILGen
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Invalid fix-it on unused optional binding when multiple conditions 4 months ago
compiler good first issue diagnostics quality type checker fix-its statements swift 6.4
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-8252] Consolidate and Fix -debug-crash-* Flags 5 months ago
improvement compiler good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Misleading error about `nonisolated` not being applicable to mutable stored properties 5 months ago
concurrency compiler good first issue diagnostics quality type checker actor isolation swift 6.3
swiftlang/swift
70.1K

The Swift Programming Language

Swift
replace all uses of `interleave` ( that use ", ") with `interleaveComma` 5 months ago
good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Separate `-dump-clang-diagnostics` into two features. 6 months ago
clang importer good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-14443] [C++] Don't crash on invalid dependent values. 6 months ago
bug c++ interop compiler good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-15093] Update availability diagnostic for macOS major version number changes 7 months ago
bug compiler good first issue diagnostics quality
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Improve the error message for passing `(any P)?` to `(some P)?` 7 months ago
compiler good first issue diagnostics quality type checker Optional generics existentials
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Passing class-constrained type as AnyObject instance behavior is not matched on Darwin and non-Darwin platform 7 months ago
bug good first issue type checker swift 5.9
swiftlang/swift
70.1K

The Swift Programming Language

Swift
No fix-it for escaping closure captures 'inout' parameter 7 months ago
compiler good first issue diagnostics quality fix-its SIL closures capture lists expressions inout value capturing swift 6.3
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Build Debug versions of `swiftrt.o` (`swiftrtd.o`) 8 months ago
good first issue Windows runtime
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Redundant error for missing type annotation in computed property 8 months ago
compiler good first issue diagnostics QoI type checker let & var swift 6.3
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Missing note for duplicate global actor annotations 8 months ago
bug concurrency good first issue Concurrencу
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-11989] Better diagnostic for invalid 'enclosing self' property wrapper subscript 8 months ago
bug compiler good first issue diagnostics QoI property wrappers swift 5.9
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-15051] Swift should suggest updating existing @available attribute when you use an insufficiently available declaration 8 months ago
improvement compiler good first issue diagnostics QoI type checker fix-its availability
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-9040] Suggestion when overriding implictly unwrapped optional does not suggest making parameter implictly unwrapped 8 months ago
bug compiler good first issue diagnostics QoI
swiftlang/swift
70.1K

The Swift Programming Language

Swift
No fix-it for missing type annotation in computed property 8 months ago
compiler good first issue diagnostics QoI type checker fix-its let & var swift 6.3
swiftlang/swift
70.1K

The Swift Programming Language

Swift
☂️ Use llvm-lit's internal shell by default 8 months ago
test suite good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
SendNonSendable Crash: "constructing SILType with type that should have been eliminated by SIL lowering" 8 months ago
concurrency compiler good first issue crash SIL needs tests swift 6.2
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Redundant effect warnings should have fixits 8 months ago
compiler good first issue diagnostics QoI type checker fix-its error handling swift 6.3
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-3316] "Script mode" globals have internal visibility and can be accessed before initialization from other files 9 months ago
compiler good first issue swift evolution proposal needed access control script mode
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-3550] Compound name syntax for functions with no params 9 months ago
compiler good first issue swift evolution proposal needed declaration names
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-1691] Run longer tests first 9 months ago
test suite good first issue python
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-888] Sequence.minElement() and maxElement() should be protocol requirements (customization points) 9 months ago
good first issue standard library affects ABI swift evolution proposal needed
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Bad diagnostic about memberwise `init` not being public 9 months ago
compiler good first issue diagnostics QoI type checker conformances fix-its access control memberwise init swift 6.2
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-6207] Misleading error for unqualified use of static variable in method 9 months ago
bug compiler good first issue diagnostics QoI type checker expressions static declarations swift 6.0
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Bad diagnostic when inheriting from class in extension 9 months ago
bug compiler good first issue diagnostics QoI type checker inheritance extension swift 6.0
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-978] Warn on do {} with only one empty catch {} block 10 months ago
improvement compiler good first issue diagnostics QoI swift 5.9 missing warning statements do catch
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-11619] Spurious error "anonymous closure argument not contained in a closure" in #if false 10 months ago
bug compiler good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-3760] zip should be a collection when both arguments are a collection 11 months ago
improvement good first issue standard library affects ABI swift evolution proposal needed
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Incorrect fix-it for static member access on instance 11 months ago
compiler good first issue diagnostics QoI type checker fix-its generics opaque parameter types static declarations
swiftlang/swift
70.1K

The Swift Programming Language

Swift
We should have a tool that finds unused diagnostic IDs 12 months ago
compiler good first issue feature utils development tools QoI
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Diagnostic for use of plain protocol name in type position should suggest `some` or `any` 12 months ago
bug compiler good first issue diagnostics QoI type checker fix-its generics opaque types existentials swift 5.9 types
swiftlang/swift
70.1K

The Swift Programming Language

Swift
[SR-539] Cascading documentation comments about 1 year ago
bug good first issue
swiftlang/swift
70.1K

The Swift Programming Language

Swift
Missing fixits for missing @dynamicMemberLookup impl about 1 year ago
bug compiler good first issue diagnostics QoI type checker fix-its attributes @dynamicMemberLookup swift 6.2
swiftlang/swift
70.1K

The Swift Programming Language

Swift