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Track the adoption of Swift 6 strict concurrency checks for data race safety. How many packages are Ready for Swift 6?

Build Information

Successful build of ParserCombinators, reference 0.5.5 (672588), with Swift 6.0 for macOS (SPM) on 26 Nov 2024 13:29:43 UTC.

Swift 6 data race errors: 4

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures

Build Log

========================================
RunAll
========================================
Builder version: 4.58.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/turbolent/parsercombinators.git
Reference: 0.5.5
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/turbolent/parsercombinators
 * tag               0.5.5      -> FETCH_HEAD
HEAD is now at 6725887 also make reader members open
Cloned https://github.com/turbolent/parsercombinators.git
Revision (git rev-parse @):
672588767167a58dc43ceb9bb8e56a497798b16e
SUCCESS checkout https://github.com/turbolent/parsercombinators.git at 0.5.5
Fetching https://github.com/turbolent/DiffedAssertEqual.git
Fetching https://github.com/turbolent/ParserDescription.git
Fetching https://github.com/turbolent/Trampoline.git
[1/67] Fetching trampoline
[61/130] Fetching trampoline, diffedassertequal
Fetched https://github.com/turbolent/DiffedAssertEqual.git from cache (0.59s)
[65/163] Fetching trampoline, parserdescription
Fetched https://github.com/turbolent/ParserDescription.git from cache (0.74s)
Fetched https://github.com/turbolent/Trampoline.git from cache (0.74s)
Computing version for https://github.com/turbolent/ParserDescription.git
Computed https://github.com/turbolent/ParserDescription.git at 0.6.0 (0.55s)
Computing version for https://github.com/turbolent/Trampoline.git
Computed https://github.com/turbolent/Trampoline.git at 0.4.1 (0.52s)
Computing version for https://github.com/turbolent/DiffedAssertEqual.git
Computed https://github.com/turbolent/DiffedAssertEqual.git at 0.3.0 (0.54s)
Creating working copy for https://github.com/turbolent/ParserDescription.git
Working copy of https://github.com/turbolent/ParserDescription.git resolved at 0.6.0
Creating working copy for https://github.com/turbolent/Trampoline.git
Working copy of https://github.com/turbolent/Trampoline.git resolved at 0.4.1
Creating working copy for https://github.com/turbolent/DiffedAssertEqual.git
Working copy of https://github.com/turbolent/DiffedAssertEqual.git resolved at 0.3.0
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "parsercombinators",
      "name": "ParserCombinators",
      "url": "https://github.com/turbolent/parsercombinators.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/parsercombinators",
      "dependencies": [
        {
          "identity": "trampoline",
          "name": "Trampoline",
          "url": "https://github.com/turbolent/Trampoline.git",
          "version": "0.4.1",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Trampoline",
          "dependencies": [
          ]
        },
        {
          "identity": "diffedassertequal",
          "name": "DiffedAssertEqual",
          "url": "https://github.com/turbolent/DiffedAssertEqual.git",
          "version": "0.3.0",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/DiffedAssertEqual",
          "dependencies": [
          ]
        },
        {
          "identity": "parserdescription",
          "name": "ParserDescription",
          "url": "https://github.com/turbolent/ParserDescription.git",
          "version": "0.6.0",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/ParserDescription",
          "dependencies": [
            {
              "identity": "diffedassertequal",
              "name": "DiffedAssertEqual",
              "url": "https://github.com/turbolent/DiffedAssertEqual.git",
              "version": "0.3.0",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/DiffedAssertEqual",
              "dependencies": [
              ]
            }
          ]
        }
      ]
    }
  ]
}
Fetching https://github.com/turbolent/parsercombinators.git
[1/960] Fetching parsercombinators
Fetched https://github.com/turbolent/parsercombinators.git from cache (0.80s)
Fetching https://github.com/turbolent/DiffedAssertEqual.git from cache
Fetching https://github.com/turbolent/Trampoline.git from cache
Fetching https://github.com/turbolent/ParserDescription.git from cache
Fetched https://github.com/turbolent/ParserDescription.git from cache (0.49s)
Fetched https://github.com/turbolent/DiffedAssertEqual.git from cache (0.49s)
Fetched https://github.com/turbolent/Trampoline.git from cache (0.49s)
Computing version for https://github.com/turbolent/ParserDescription.git
Computed https://github.com/turbolent/ParserDescription.git at 0.6.0 (0.02s)
Computing version for https://github.com/turbolent/Trampoline.git
Computed https://github.com/turbolent/Trampoline.git at 0.4.1 (0.02s)
Computing version for https://github.com/turbolent/DiffedAssertEqual.git
Computed https://github.com/turbolent/DiffedAssertEqual.git at 0.3.0 (0.02s)
Creating working copy for https://github.com/turbolent/Trampoline.git
Working copy of https://github.com/turbolent/Trampoline.git resolved at 0.4.1
Creating working copy for https://github.com/turbolent/ParserDescription.git
Working copy of https://github.com/turbolent/ParserDescription.git resolved at 0.6.0
Creating working copy for https://github.com/turbolent/DiffedAssertEqual.git
Working copy of https://github.com/turbolent/DiffedAssertEqual.git resolved at 0.3.0
Creating working copy for https://github.com/turbolent/parsercombinators.git
Working copy of https://github.com/turbolent/parsercombinators.git resolved at 0.5.5 (6725887)
warning: '.resolve-product-dependencies': dependency 'parsercombinators' is not used by any target
Found 3 product dependencies
  - Trampoline
  - DiffedAssertEqual
  - ParserDescription
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $PWD
https://github.com/turbolent/parsercombinators.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
Building for debugging...
[0/5] Write sources
[4/5] Write swift-version--7754E27361AE5C74.txt
[6/13] Compiling Trampoline Trampoline.swift
[7/13] Emitting module Trampoline
[8/13] Compiling Trampoline Either.swift
[9/13] Emitting module ParserDescription
[10/13] Compiling ParserDescription Operation.swift
[11/13] Compiling ParserDescription Pattern.swift
[12/13] Compiling ParserDescription Condition.swift
[13/13] Compiling ParserDescription Token.swift
[14/36] Compiling ParserCombinators Seq.swift
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Sequenceable.swift:14:23: warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
11 |
12 |
13 | public struct Unit: Equatable {
   |               `- note: consider making struct 'Unit' conform to the 'Sendable' protocol
14 |     public static let empty = Unit()
   |                       |- warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: annotate 'empty' with '@MainActor' if property should only be accessed from the main actor
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |     private init() {}
16 | }
[15/36] Compiling ParserCombinators Sequenceable.swift
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Sequenceable.swift:14:23: warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
11 |
12 |
13 | public struct Unit: Equatable {
   |               `- note: consider making struct 'Unit' conform to the 'Sendable' protocol
14 |     public static let empty = Unit()
   |                       |- warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: annotate 'empty' with '@MainActor' if property should only be accessed from the main actor
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |     private init() {}
16 | }
[16/38] Compiling ParserCombinators ParseResult.swift
[17/38] Compiling ParserCombinators Parser.swift
[18/38] Compiling ParserCombinators End.swift
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Sequenceable.swift:14:23: warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
11 |
12 |
13 | public struct Unit: Equatable {
   |               `- note: consider making struct 'Unit' conform to the 'Sendable' protocol
14 |     public static let empty = Unit()
   |                       |- warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: annotate 'empty' with '@MainActor' if property should only be accessed from the main actor
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |     private init() {}
16 | }
[19/38] Compiling ParserCombinators FollowedBy.swift
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Sequenceable.swift:14:23: warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
11 |
12 |
13 | public struct Unit: Equatable {
   |               `- note: consider making struct 'Unit' conform to the 'Sendable' protocol
14 |     public static let empty = Unit()
   |                       |- warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: annotate 'empty' with '@MainActor' if property should only be accessed from the main actor
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |     private init() {}
16 | }
[20/38] Compiling ParserCombinators Lazy.swift
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Sequenceable.swift:14:23: warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
11 |
12 |
13 | public struct Unit: Equatable {
   |               `- note: consider making struct 'Unit' conform to the 'Sendable' protocol
14 |     public static let empty = Unit()
   |                       |- warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: annotate 'empty' with '@MainActor' if property should only be accessed from the main actor
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |     private init() {}
16 | }
[21/38] Compiling ParserCombinators Map.swift
[22/38] Compiling ParserCombinators NotFollowedBy.swift
[23/38] Compiling ParserCombinators Opt.swift
[24/38] Compiling ParserCombinators Recursive.swift
[25/38] Compiling ParserCombinators Rep.swift
[26/38] Compiling ParserCombinators Or.swift
[27/38] Compiling ParserCombinators PackratReader.swift
[28/38] Compiling ParserCombinators Patterns.swift
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Patterns.swift:7:16: warning: stored property 'pattern' of 'Sendable'-conforming struct 'UnsupportedPatternError' has non-sendable type 'any _Pattern'; this is an error in the Swift 6 language mode
  5 |
  6 | public struct UnsupportedPatternError: Error {
  7 |     public let pattern: _Pattern
    |                `- warning: stored property 'pattern' of 'Sendable'-conforming struct 'UnsupportedPatternError' has non-sendable type 'any _Pattern'; this is an error in the Swift 6 language mode
  8 | }
  9 |
/Users/admin/builder/spi-builder-workspace/.build/checkouts/ParserDescription/Sources/ParserDescription/Pattern.swift:10:17: note: protocol '_Pattern' does not conform to the 'Sendable' protocol
  8 | }
  9 |
 10 | public protocol _Pattern: Codable {
    |                 `- note: protocol '_Pattern' does not conform to the 'Sendable' protocol
 11 |     var type: PatternType { get }
 12 | }
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Patterns.swift:3:1: warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'ParserDescription'
  1 |
  2 | import Foundation
  3 | import ParserDescription
    | `- warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'ParserDescription'
  4 |
  5 |
[29/38] Compiling ParserCombinators Reader.swift
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Patterns.swift:7:16: warning: stored property 'pattern' of 'Sendable'-conforming struct 'UnsupportedPatternError' has non-sendable type 'any _Pattern'; this is an error in the Swift 6 language mode
  5 |
  6 | public struct UnsupportedPatternError: Error {
  7 |     public let pattern: _Pattern
    |                `- warning: stored property 'pattern' of 'Sendable'-conforming struct 'UnsupportedPatternError' has non-sendable type 'any _Pattern'; this is an error in the Swift 6 language mode
  8 | }
  9 |
/Users/admin/builder/spi-builder-workspace/.build/checkouts/ParserDescription/Sources/ParserDescription/Pattern.swift:10:17: note: protocol '_Pattern' does not conform to the 'Sendable' protocol
  8 | }
  9 |
 10 | public protocol _Pattern: Codable {
    |                 `- note: protocol '_Pattern' does not conform to the 'Sendable' protocol
 11 |     var type: PatternType { get }
 12 | }
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Patterns.swift:3:1: warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'ParserDescription'
  1 |
  2 | import Foundation
  3 | import ParserDescription
    | `- warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'ParserDescription'
  4 |
  5 |
[30/38] Compiling ParserCombinators CollectionReader.swift
[31/38] Compiling ParserCombinators Commit.swift
[32/38] Compiling ParserCombinators Either.swift
[33/38] Emitting module ParserCombinators
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Patterns.swift:7:16: warning: stored property 'pattern' of 'Sendable'-conforming struct 'UnsupportedPatternError' has non-sendable type 'any _Pattern'; this is an error in the Swift 6 language mode
  5 |
  6 | public struct UnsupportedPatternError: Error {
  7 |     public let pattern: _Pattern
    |                `- warning: stored property 'pattern' of 'Sendable'-conforming struct 'UnsupportedPatternError' has non-sendable type 'any _Pattern'; this is an error in the Swift 6 language mode
  8 | }
  9 |
/Users/admin/builder/spi-builder-workspace/.build/checkouts/ParserDescription/Sources/ParserDescription/Pattern.swift:10:17: note: protocol '_Pattern' does not conform to the 'Sendable' protocol
  8 | }
  9 |
 10 | public protocol _Pattern: Codable {
    |                 `- note: protocol '_Pattern' does not conform to the 'Sendable' protocol
 11 |     var type: PatternType { get }
 12 | }
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Patterns.swift:3:1: warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'ParserDescription'
  1 |
  2 | import Foundation
  3 | import ParserDescription
    | `- warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'ParserDescription'
  4 |
  5 |
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Sequenceable.swift:14:23: warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
11 |
12 |
13 | public struct Unit: Equatable {
   |               `- note: consider making struct 'Unit' conform to the 'Sendable' protocol
14 |     public static let empty = Unit()
   |                       |- warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: annotate 'empty' with '@MainActor' if property should only be accessed from the main actor
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |     private init() {}
16 | }
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/StringParser.swift:52:12: warning: let 'whitespaceCharacter' is not concurrency-safe because non-'Sendable' type 'Parser<Character, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
50 | private let whitespaceCharacterSet: CharacterSet = [" ", "\t", "\r", "\n"]
51 |
52 | public let whitespaceCharacter: Parser<Character, Character> =
   |            |- warning: let 'whitespaceCharacter' is not concurrency-safe because non-'Sendable' type 'Parser<Character, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: annotate 'whitespaceCharacter' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
53 |     `in`(whitespaceCharacterSet, kind: "whitespace")
54 |
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Parser.swift:4:14: note: generic class 'Parser' does not conform to the 'Sendable' protocol
 2 | import Trampoline
 3 |
 4 | public class Parser<T, Element> {
   |              `- note: generic class 'Parser' does not conform to the 'Sendable' protocol
 5 |     public typealias Input = Reader<Element>
 6 |     public typealias Result = ParseResult<T, Element>
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/StringParser.swift:55:12: warning: let 'whitespace' is not concurrency-safe because non-'Sendable' type 'Parser<Unit, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
53 |     `in`(whitespaceCharacterSet, kind: "whitespace")
54 |
55 | public let whitespace: Parser<Unit, Character> =
   |            |- warning: let 'whitespace' is not concurrency-safe because non-'Sendable' type 'Parser<Unit, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: annotate 'whitespace' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
56 |     whitespaceCharacter.map(Unit.empty).rep()
57 |
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Parser.swift:4:14: note: generic class 'Parser' does not conform to the 'Sendable' protocol
 2 | import Trampoline
 3 |
 4 | public class Parser<T, Element> {
   |              `- note: generic class 'Parser' does not conform to the 'Sendable' protocol
 5 |     public typealias Input = Reader<Element>
 6 |     public typealias Result = ParseResult<T, Element>
[34/38] Compiling ParserCombinators Accept.swift
[35/38] Compiling ParserCombinators Capturing.swift
[36/38] Compiling ParserCombinators Chain.swift
[37/38] Compiling ParserCombinators SkipUntil.swift
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/StringParser.swift:52:12: warning: let 'whitespaceCharacter' is not concurrency-safe because non-'Sendable' type 'Parser<Character, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
50 | private let whitespaceCharacterSet: CharacterSet = [" ", "\t", "\r", "\n"]
51 |
52 | public let whitespaceCharacter: Parser<Character, Character> =
   |            |- warning: let 'whitespaceCharacter' is not concurrency-safe because non-'Sendable' type 'Parser<Character, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: annotate 'whitespaceCharacter' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
53 |     `in`(whitespaceCharacterSet, kind: "whitespace")
54 |
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Parser.swift:4:14: note: generic class 'Parser' does not conform to the 'Sendable' protocol
 2 | import Trampoline
 3 |
 4 | public class Parser<T, Element> {
   |              `- note: generic class 'Parser' does not conform to the 'Sendable' protocol
 5 |     public typealias Input = Reader<Element>
 6 |     public typealias Result = ParseResult<T, Element>
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/StringParser.swift:55:12: warning: let 'whitespace' is not concurrency-safe because non-'Sendable' type 'Parser<Unit, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
53 |     `in`(whitespaceCharacterSet, kind: "whitespace")
54 |
55 | public let whitespace: Parser<Unit, Character> =
   |            |- warning: let 'whitespace' is not concurrency-safe because non-'Sendable' type 'Parser<Unit, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: annotate 'whitespace' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
56 |     whitespaceCharacter.map(Unit.empty).rep()
57 |
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Parser.swift:4:14: note: generic class 'Parser' does not conform to the 'Sendable' protocol
 2 | import Trampoline
 3 |
 4 | public class Parser<T, Element> {
   |              `- note: generic class 'Parser' does not conform to the 'Sendable' protocol
 5 |     public typealias Input = Reader<Element>
 6 |     public typealias Result = ParseResult<T, Element>
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Sequenceable.swift:14:23: warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
11 |
12 |
13 | public struct Unit: Equatable {
   |               `- note: consider making struct 'Unit' conform to the 'Sendable' protocol
14 |     public static let empty = Unit()
   |                       |- warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: annotate 'empty' with '@MainActor' if property should only be accessed from the main actor
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |     private init() {}
16 | }
[38/38] Compiling ParserCombinators StringParser.swift
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/StringParser.swift:52:12: warning: let 'whitespaceCharacter' is not concurrency-safe because non-'Sendable' type 'Parser<Character, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
50 | private let whitespaceCharacterSet: CharacterSet = [" ", "\t", "\r", "\n"]
51 |
52 | public let whitespaceCharacter: Parser<Character, Character> =
   |            |- warning: let 'whitespaceCharacter' is not concurrency-safe because non-'Sendable' type 'Parser<Character, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: annotate 'whitespaceCharacter' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
53 |     `in`(whitespaceCharacterSet, kind: "whitespace")
54 |
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Parser.swift:4:14: note: generic class 'Parser' does not conform to the 'Sendable' protocol
 2 | import Trampoline
 3 |
 4 | public class Parser<T, Element> {
   |              `- note: generic class 'Parser' does not conform to the 'Sendable' protocol
 5 |     public typealias Input = Reader<Element>
 6 |     public typealias Result = ParseResult<T, Element>
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/StringParser.swift:55:12: warning: let 'whitespace' is not concurrency-safe because non-'Sendable' type 'Parser<Unit, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
53 |     `in`(whitespaceCharacterSet, kind: "whitespace")
54 |
55 | public let whitespace: Parser<Unit, Character> =
   |            |- warning: let 'whitespace' is not concurrency-safe because non-'Sendable' type 'Parser<Unit, Character>' may have shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: annotate 'whitespace' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
56 |     whitespaceCharacter.map(Unit.empty).rep()
57 |
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Parser.swift:4:14: note: generic class 'Parser' does not conform to the 'Sendable' protocol
 2 | import Trampoline
 3 |
 4 | public class Parser<T, Element> {
   |              `- note: generic class 'Parser' does not conform to the 'Sendable' protocol
 5 |     public typealias Input = Reader<Element>
 6 |     public typealias Result = ParseResult<T, Element>
/Users/admin/builder/spi-builder-workspace/Sources/ParserCombinators/Sequenceable.swift:14:23: warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
11 |
12 |
13 | public struct Unit: Equatable {
   |               `- note: consider making struct 'Unit' conform to the 'Sendable' protocol
14 |     public static let empty = Unit()
   |                       |- warning: static property 'empty' is not concurrency-safe because non-'Sendable' type 'Unit' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: annotate 'empty' with '@MainActor' if property should only be accessed from the main actor
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |     private init() {}
16 | }
[39/44] Compiling ParserCombinatorOperators Or.swift
[40/44] Emitting module ParserCombinatorOperators
[41/44] Compiling ParserCombinatorOperators Precedence.swift
[42/44] Compiling ParserCombinatorOperators Map.swift
[43/44] Compiling ParserCombinatorOperators Seq.swift
[44/44] Compiling ParserCombinatorOperators StringParser.swift
Build complete! (7.29s)
Build complete.
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  "platforms" : [
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  "products" : [
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  "targets" : [
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Done.