Swift Package Index

Build Information

Failed to build SwiftCheck, reference 0.13.1 (8ce569), with Swift 6.0 for macOS (SPM) on 19 Oct 2025 09:50:48 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.2.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
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Builder version: 4.68.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/toastersocks/SwiftCheck.git
Reference: 0.13.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/toastersocks/SwiftCheck
 * tag               0.13.1     -> FETCH_HEAD
HEAD is now at 8ce569a Fix compatibility with older Swift compiler versions
Submodule path 'Carthage/Checkouts/FileCheck': checked out 'bd9cb30ceee1f21c02f51a7168f58471449807d8'
Submodule 'Carthage/Checkouts/FileCheck' (https://github.com/trill-lang/FileCheck.git) registered for path 'Carthage/Checkouts/FileCheck'
Cloning into '/Users/admin/builder/spi-builder-workspace/Carthage/Checkouts/FileCheck'...
Cloned https://github.com/toastersocks/SwiftCheck.git
Revision (git rev-parse @):
8ce569ae88b7fef2f4e22bf99ec27a9412124ee3
SUCCESS checkout https://github.com/toastersocks/SwiftCheck.git at 0.13.1
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Build
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Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $PWD
https://github.com/toastersocks/SwiftCheck.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.2.0.app xcrun swift build --arch arm64
[1/1] Compiling plugin GenerateDoccReference
[2/2] Compiling plugin GenerateManual
Building for debugging...
[2/4] Write sources
[3/4] Write swift-version-5BDAB9E9C0126B9D.txt
[5/19] Compiling SwiftCheck Test.swift
[6/19] Compiling SwiftCheck Testable.swift
[7/19] Compiling SwiftCheck State.swift
[8/19] Compiling SwiftCheck Rose.swift
[9/19] Compiling SwiftCheck Lattice.swift
[10/19] Compiling SwiftCheck Modifiers.swift
[11/19] Compiling SwiftCheck Compose.swift
[12/19] Compiling SwiftCheck Gen.swift
[13/19] Emitting module SwiftCheck
[14/19] Compiling SwiftCheck Check.swift
[15/19] Compiling SwiftCheck CoArbitrary.swift
[16/19] Compiling SwiftCheck Arbitrary.swift
[17/19] Compiling SwiftCheck Cartesian.swift
[18/19] Compiling SwiftCheck Property.swift
/Users/admin/builder/spi-builder-workspace/Sources/SwiftCheck/Random.swift:127:13: error: 'inout sending' parameter 'gen' cannot be task-isolated at end of function
125 |             let (left, right) = gen.split
126 |             gen = left
127 |             return right
    |             |- error: 'inout sending' parameter 'gen' cannot be task-isolated at end of function
    |             `- note: task-isolated 'gen' risks causing races in between task-isolated uses and caller uses since caller assumes value is not actor isolated
128 |         }
129 |     }
[19/19] Compiling SwiftCheck Random.swift
/Users/admin/builder/spi-builder-workspace/Sources/SwiftCheck/Random.swift:127:13: error: 'inout sending' parameter 'gen' cannot be task-isolated at end of function
125 |             let (left, right) = gen.split
126 |             gen = left
127 |             return right
    |             |- error: 'inout sending' parameter 'gen' cannot be task-isolated at end of function
    |             `- note: task-isolated 'gen' risks causing races in between task-isolated uses and caller uses since caller assumes value is not actor isolated
128 |         }
129 |     }
[20/20] Compiling SwiftCheck WitnessedArbitrary.swift
Fetching https://github.com/llvm-swift/FileCheck.git
[10/479] Fetching filecheck
Fetched https://github.com/llvm-swift/FileCheck.git from cache (0.67s)
Computing version for https://github.com/llvm-swift/FileCheck.git
Computed https://github.com/llvm-swift/FileCheck.git at 0.2.6 (3.26s)
Fetching https://github.com/apple/swift-argument-parser
Fetching https://github.com/mxcl/Chalk.git
[1/81] Fetching chalk
[59/16763] Fetching chalk, swift-argument-parser
Fetched https://github.com/mxcl/Chalk.git from cache (1.51s)
Fetched https://github.com/apple/swift-argument-parser from cache (1.51s)
Computing version for https://github.com/mxcl/Chalk.git
Computed https://github.com/mxcl/Chalk.git at 0.5.0 (0.55s)
Computing version for https://github.com/apple/swift-argument-parser
Computed https://github.com/apple/swift-argument-parser at 1.6.2 (0.49s)
Creating working copy for https://github.com/llvm-swift/FileCheck.git
Working copy of https://github.com/llvm-swift/FileCheck.git resolved at 0.2.6
Creating working copy for https://github.com/apple/swift-argument-parser
Working copy of https://github.com/apple/swift-argument-parser resolved at 1.6.2
Creating working copy for https://github.com/mxcl/Chalk.git
Working copy of https://github.com/mxcl/Chalk.git resolved at 0.5.0
BUILD FAILURE 6.0 macosSpm