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Build Information

Successful build of swift-prelude, reference main (a21df6), with Swift 6.4 for macOS (SPM) on 17 Sep 2026 22:42:49 UTC.

Swift 6 data race errors: 0

Build Command

env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 5.1.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/pointfreeco/swift-prelude.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/pointfreeco/swift-prelude
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at a21df6f Add `.editorconfig` for consistent code formatting (#174)
Cloned https://github.com/pointfreeco/swift-prelude.git
Revision (git rev-parse @):
a21df6f5932673f3f20d7f0ca1f8e0a7c887b3c2
SUCCESS checkout https://github.com/pointfreeco/swift-prelude.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/pointfreeco/swift-prelude.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64
Building for debugging...
[Computing dependencies]
[Constructing description]
[Pre-planning 1 / 738]
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Build complete! (19.19 sec)
Fetching https://github.com/pointfreeco/swift-dependencies
[1/7591] Fetching swift-dependencies
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Computing version for https://github.com/pointfreeco/swift-dependencies
Computed https://github.com/pointfreeco/swift-dependencies at 1.17.1 (1.90s)
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Creating working copy for https://github.com/pointfreeco/swift-dependencies
Working copy of https://github.com/pointfreeco/swift-dependencies resolved at 1.17.1
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Working copy of https://github.com/pointfreeco/swift-issue-reporting resolved at 2.1.0
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Working copy of https://github.com/pointfreeco/swift-clocks resolved at 1.1.1
Creating working copy for https://github.com/pointfreeco/swift-concurrency-extras
Working copy of https://github.com/pointfreeco/swift-concurrency-extras resolved at 1.4.1
warning: 'spi-builder-workspace': found 33 file(s) which are unhandled; explicitly declare them as resources or exclude from the target
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testAddOver.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testAppendOver.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Successful left-hand traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Successful nested left-hand traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Successful nested right-hand traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Successful some traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Successful-left-hand-traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Successful-nested-left-hand-traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Successful-nested-right-hand-traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Successful-some-traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Unsuccessful right-hand traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Unsuccessful some traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Unsuccessful-right-hand-traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testChoicePrisms.Unsuccessful-some-traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testConjOver.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testDisjOver.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testDivOver.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testIx.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testLots.Nested choice prismatic traversals.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testLots.Nested indexed choice.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testLots.Nested-choice-prismatic-traversals.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testLots.Nested-indexed-choice.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testMulOver.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testOver.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testSet.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testStrongPrisms.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testSubOver.1.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testTraversed.Array traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testTraversed.Array-traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testTraversed.None traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testTraversed.None-traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testTraversed.Some traversal.txt
    /Users/admin/builder/spi-builder-workspace/Tests/OpticsTests/__Snapshots__/OpticsTests/testTraversed.Some-traversal.txt
/Users/admin/builder/spi-builder-workspace/Sources/Prelude/Comparable.swift:17:1: warning: extension declares a conformance of imported type 'Bool' to imported protocol 'Comparable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
15 | }
16 |
17 | extension Bool: Comparable {
   | |- warning: extension declares a conformance of imported type 'Bool' to imported protocol 'Comparable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
   | `- note: add '@retroactive' to silence this warning
18 |   public static func < (lhs: Bool, rhs: Bool) -> Bool {
19 |     return (lhs, rhs) == (false, true)
/Users/admin/builder/spi-builder-workspace/Sources/Prelude/Func.swift:39:28: warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
  1 |
  2 | public struct Func<A, B> {
    |                    `- note: 'A' previously declared here
  3 |   public let call: (A) -> B
  4 |
    :
 37 |   }
 38 |
 39 |   public static func >¢< <A, B, C>(f: @escaping (B) -> A, g: Func<A, C>) -> Func<B, C> {
    |                           `- warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 40 |     return g.contramap(f)
 41 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Prelude/Func.swift:39:31: warning: generic parameter 'B' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
  1 |
  2 | public struct Func<A, B> {
    |                       `- note: 'B' previously declared here
  3 |   public let call: (A) -> B
  4 |
    :
 37 |   }
 38 |
 39 |   public static func >¢< <A, B, C>(f: @escaping (B) -> A, g: Func<A, C>) -> Func<B, C> {
    |                              `- warning: generic parameter 'B' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 40 |     return g.contramap(f)
 41 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Prelude/Func.swift:39:28: warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
  1 |
  2 | public struct Func<A, B> {
    |                    `- note: 'A' previously declared here
  3 |   public let call: (A) -> B
  4 |
    :
 37 |   }
 38 |
 39 |   public static func >¢< <A, B, C>(f: @escaping (B) -> A, g: Func<A, C>) -> Func<B, C> {
    |                           `- warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 40 |     return g.contramap(f)
 41 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Prelude/Func.swift:39:31: warning: generic parameter 'B' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
  1 |
  2 | public struct Func<A, B> {
    |                       `- note: 'B' previously declared here
  3 |   public let call: (A) -> B
  4 |
    :
 37 |   }
 38 |
 39 |   public static func >¢< <A, B, C>(f: @escaping (B) -> A, g: Func<A, C>) -> Func<B, C> {
    |                              `- warning: generic parameter 'B' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 40 |     return g.contramap(f)
 41 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Prelude/Comparable.swift:17:1: warning: extension declares a conformance of imported type 'Bool' to imported protocol 'Comparable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
15 | }
16 |
17 | extension Bool: Comparable {
   | |- warning: extension declares a conformance of imported type 'Bool' to imported protocol 'Comparable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
   | `- note: add '@retroactive' to silence this warning
18 |   public static func < (lhs: Bool, rhs: Bool) -> Bool {
19 |     return (lhs, rhs) == (false, true)
/Users/admin/builder/spi-builder-workspace/Sources/Writer/Writer.swift:24:28: warning: generic parameter 'W' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Writer<W: Monoid, A> {
   |                      `- note: 'W' previously declared here
 4 |   let a: A
 5 |   let w: W
   :
22 |   }
23 |
24 |   public static func <¢> <W, A, B> (f: @escaping (A) -> B, writer: Writer<W, A>) -> Writer<W, B> {
   |                           `- warning: generic parameter 'W' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
25 |     return writer.map(f)
26 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Writer/Writer.swift:24:31: warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Writer<W: Monoid, A> {
   |                                 `- note: 'A' previously declared here
 4 |   let a: A
 5 |   let w: W
   :
22 |   }
23 |
24 |   public static func <¢> <W, A, B> (f: @escaping (A) -> B, writer: Writer<W, A>) -> Writer<W, B> {
   |                              `- warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
25 |     return writer.map(f)
26 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Writer/Writer.swift:36:27: warning: generic parameter 'W' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Writer<W: Monoid, A> {
   |                      `- note: 'W' previously declared here
 4 |   let a: A
 5 |   let w: W
   :
34 |   }
35 |
36 |   public static func <*> <W, A, B> (f: Writer<W, (A) -> B>, writer: Writer<W, A>) -> Writer<W, B> {
   |                           `- warning: generic parameter 'W' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
37 |     return writer.apply(f)
38 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Writer/Writer.swift:36:30: warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Writer<W: Monoid, A> {
   |                                 `- note: 'A' previously declared here
 4 |   let a: A
 5 |   let w: W
   :
34 |   }
35 |
36 |   public static func <*> <W, A, B> (f: Writer<W, (A) -> B>, writer: Writer<W, A>) -> Writer<W, B> {
   |                              `- warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
37 |     return writer.apply(f)
38 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Writer/Writer.swift:24:28: warning: generic parameter 'W' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Writer<W: Monoid, A> {
   |                      `- note: 'W' previously declared here
 4 |   let a: A
 5 |   let w: W
   :
22 |   }
23 |
24 |   public static func <¢> <W, A, B> (f: @escaping (A) -> B, writer: Writer<W, A>) -> Writer<W, B> {
   |                           `- warning: generic parameter 'W' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
25 |     return writer.map(f)
26 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Writer/Writer.swift:24:31: warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Writer<W: Monoid, A> {
   |                                 `- note: 'A' previously declared here
 4 |   let a: A
 5 |   let w: W
   :
22 |   }
23 |
24 |   public static func <¢> <W, A, B> (f: @escaping (A) -> B, writer: Writer<W, A>) -> Writer<W, B> {
   |                              `- warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
25 |     return writer.map(f)
26 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Writer/Writer.swift:36:27: warning: generic parameter 'W' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Writer<W: Monoid, A> {
   |                      `- note: 'W' previously declared here
 4 |   let a: A
 5 |   let w: W
   :
34 |   }
35 |
36 |   public static func <*> <W, A, B> (f: Writer<W, (A) -> B>, writer: Writer<W, A>) -> Writer<W, B> {
   |                           `- warning: generic parameter 'W' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
37 |     return writer.apply(f)
38 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Writer/Writer.swift:36:30: warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Writer<W: Monoid, A> {
   |                                 `- note: 'A' previously declared here
 4 |   let a: A
 5 |   let w: W
   :
34 |   }
35 |
36 |   public static func <*> <W, A, B> (f: Writer<W, (A) -> B>, writer: Writer<W, A>) -> Writer<W, B> {
   |                              `- warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
37 |     return writer.apply(f)
38 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Reader/Reader.swift:18:28: warning: generic parameter 'R' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Reader<R, A> {
   |                      `- note: 'R' previously declared here
 4 |   public let runReader: (R) -> A
 5 |
   :
16 |   }
17 |
18 |   public static func <¢> <R, A, B> (f: @escaping (A) -> B, reader: Reader<R, A>) -> Reader<R, B> {
   |                           `- warning: generic parameter 'R' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
19 |     return reader.map(f)
20 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Reader/Reader.swift:18:31: warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Reader<R, A> {
   |                         `- note: 'A' previously declared here
 4 |   public let runReader: (R) -> A
 5 |
   :
16 |   }
17 |
18 |   public static func <¢> <R, A, B> (f: @escaping (A) -> B, reader: Reader<R, A>) -> Reader<R, B> {
   |                              `- warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
19 |     return reader.map(f)
20 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Reader/Reader.swift:32:27: warning: generic parameter 'R' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Reader<R, A> {
   |                      `- note: 'R' previously declared here
 4 |   public let runReader: (R) -> A
 5 |
   :
30 |   }
31 |
32 |   public static func <*> <R, A, B> (f: Reader<R, (A) -> B>, reader: Reader<R, A>) -> Reader<R, B> {
   |                           `- warning: generic parameter 'R' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
33 |     return reader.apply(f)
34 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Reader/Reader.swift:32:30: warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Reader<R, A> {
   |                         `- note: 'A' previously declared here
 4 |   public let runReader: (R) -> A
 5 |
   :
30 |   }
31 |
32 |   public static func <*> <R, A, B> (f: Reader<R, (A) -> B>, reader: Reader<R, A>) -> Reader<R, B> {
   |                              `- warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
33 |     return reader.apply(f)
34 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Reader/Reader.swift:18:28: warning: generic parameter 'R' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Reader<R, A> {
   |                      `- note: 'R' previously declared here
 4 |   public let runReader: (R) -> A
 5 |
   :
16 |   }
17 |
18 |   public static func <¢> <R, A, B> (f: @escaping (A) -> B, reader: Reader<R, A>) -> Reader<R, B> {
   |                           `- warning: generic parameter 'R' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
19 |     return reader.map(f)
20 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Reader/Reader.swift:18:31: warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Reader<R, A> {
   |                         `- note: 'A' previously declared here
 4 |   public let runReader: (R) -> A
 5 |
   :
16 |   }
17 |
18 |   public static func <¢> <R, A, B> (f: @escaping (A) -> B, reader: Reader<R, A>) -> Reader<R, B> {
   |                              `- warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
19 |     return reader.map(f)
20 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Reader/Reader.swift:32:27: warning: generic parameter 'R' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Reader<R, A> {
   |                      `- note: 'R' previously declared here
 4 |   public let runReader: (R) -> A
 5 |
   :
30 |   }
31 |
32 |   public static func <*> <R, A, B> (f: Reader<R, (A) -> B>, reader: Reader<R, A>) -> Reader<R, B> {
   |                           `- warning: generic parameter 'R' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
33 |     return reader.apply(f)
34 |   }
/Users/admin/builder/spi-builder-workspace/Sources/Reader/Reader.swift:32:30: warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
 1 | import Prelude
 2 |
 3 | public struct Reader<R, A> {
   |                         `- note: 'A' previously declared here
 4 |   public let runReader: (R) -> A
 5 |
   :
30 |   }
31 |
32 |   public static func <*> <R, A, B> (f: Reader<R, (A) -> B>, reader: Reader<R, A>) -> Reader<R, B> {
   |                              `- warning: generic parameter 'A' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
33 |     return reader.apply(f)
34 |   }
Build complete.
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Done.