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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 combine-schedulers, reference 1.0.3 (592828), with Swift 6.1 for macOS (SPM) on 29 Apr 2025 16:20:27 UTC.

Swift 6 data race errors: 0

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats

Build Log

========================================
RunAll
========================================
Builder version: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/pointfreeco/combine-schedulers.git
Reference: 1.0.3
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/pointfreeco/combine-schedulers
 * tag               1.0.3      -> FETCH_HEAD
HEAD is now at 5928286 Update Package@swift-6.0.swift (#98)
Cloned https://github.com/pointfreeco/combine-schedulers.git
Revision (git rev-parse @):
5928286acce13def418ec36d05a001a9641086f2
SUCCESS checkout https://github.com/pointfreeco/combine-schedulers.git at 1.0.3
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/pointfreeco/combine-schedulers.git
https://github.com/pointfreeco/combine-schedulers.git
{
  "dependencies" : [
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      "identity" : "swift-concurrency-extras",
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        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
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      },
      "type" : "sourceControl",
      "url" : "https://github.com/pointfreeco/swift-concurrency-extras"
    },
    {
      "identity" : "xctest-dynamic-overlay",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.2.2",
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          }
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      "type" : "sourceControl",
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  ],
  "manifest_display_name" : "combine-schedulers",
  "name" : "combine-schedulers",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "13.0"
    },
    {
      "name" : "macos",
      "version" : "10.15"
    },
    {
      "name" : "tvos",
      "version" : "13.0"
    },
    {
      "name" : "watchos",
      "version" : "6.0"
    }
  ],
  "products" : [
    {
      "name" : "CombineSchedulers",
      "targets" : [
        "CombineSchedulers"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "6"
  ],
  "targets" : [
    {
      "c99name" : "CombineSchedulersTests",
      "module_type" : "SwiftTarget",
      "name" : "CombineSchedulersTests",
      "path" : "Tests/CombineSchedulersTests",
      "sources" : [
        "ImmediateSchedulerTests.swift",
        "TestSchedulerTests.swift",
        "TimerTests.swift",
        "UISchedulerTests.swift",
        "UnimplementedSchedulerTests.swift"
      ],
      "target_dependencies" : [
        "CombineSchedulers"
      ],
      "type" : "test"
    },
    {
      "c99name" : "CombineSchedulers",
      "module_type" : "SwiftTarget",
      "name" : "CombineSchedulers",
      "path" : "Sources/CombineSchedulers",
      "product_dependencies" : [
        "ConcurrencyExtras",
        "IssueReporting"
      ],
      "product_memberships" : [
        "CombineSchedulers"
      ],
      "sources" : [
        "AnyScheduler.swift",
        "Concurrency.swift",
        "ImmediateScheduler.swift",
        "Internal/Deprecations.swift",
        "Internal/Lock.swift",
        "Internal/NSRecursiveLock.swift",
        "SwiftUI.swift",
        "TestScheduler.swift",
        "Timer.swift",
        "UIKit.swift",
        "UIScheduler.swift",
        "UnimplementedScheduler.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "6.0"
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats
Building for debugging...
[0/4] Write sources
[3/4] Write swift-version-2F0A5646E1D333AE.txt
[5/34] Compiling IssueReporting TestContext.swift
[6/34] Compiling IssueReporting Unimplemented.swift
[7/36] Compiling IssueReporting WithExpectedIssue.swift
[8/36] Compiling IssueReporting WithIssueContext.swift
[9/36] Compiling IssueReporting IsTesting.swift
[10/36] Compiling IssueReporting IssueReporter.swift
[11/36] Compiling ConcurrencyExtras LockIsolated.swift
[12/36] Compiling ConcurrencyExtras Result.swift
[13/36] Compiling ConcurrencyExtras UncheckedBox.swift
[14/36] Compiling ConcurrencyExtras Task.swift
[15/37] Compiling ConcurrencyExtras MainSerialExecutor.swift
[16/37] Compiling IssueReporting LockIsolated.swift
[17/37] Compiling IssueReporting Rethrows.swift
[18/37] Compiling IssueReporting Warn.swift
[19/37] Compiling IssueReporting XCTest.swift
[20/37] Compiling IssueReporting SwiftTesting.swift
[21/37] Compiling IssueReporting UncheckedSendable.swift
[22/37] Compiling ConcurrencyExtras Locking.swift
[23/37] Compiling ConcurrencyExtras AsyncThrowingStream.swift
[24/37] Compiling IssueReporting ErrorReporting.swift
[25/37] Compiling IssueReporting AppHostWarning.swift
[26/37] Compiling IssueReporting Deprecations.swift
[27/37] Compiling IssueReporting FailureObserver.swift
[28/37] Emitting module IssueReporting
[29/37] Emitting module ConcurrencyExtras
[32/37] Compiling ConcurrencyExtras AsyncStream.swift
[33/37] Compiling IssueReporting BreakpointReporter.swift
[34/37] Compiling IssueReporting FatalErrorReporter.swift
[35/37] Compiling IssueReporting RuntimeWarningReporter.swift
[36/37] Compiling IssueReporting ReportIssue.swift
[37/37] Compiling ConcurrencyExtras UncheckedSendable.swift
[38/49] Compiling CombineSchedulers UIScheduler.swift
[39/50] Compiling CombineSchedulers UIKit.swift
[40/50] Compiling CombineSchedulers Timer.swift
[41/50] Compiling CombineSchedulers Lock.swift
[42/50] Compiling CombineSchedulers AnyScheduler.swift
[43/50] Compiling CombineSchedulers Concurrency.swift
[44/50] Compiling CombineSchedulers UnimplementedScheduler.swift
[45/50] Compiling CombineSchedulers ImmediateScheduler.swift
[46/50] Compiling CombineSchedulers Deprecations.swift
[47/50] Compiling CombineSchedulers NSRecursiveLock.swift
[48/50] Compiling CombineSchedulers SwiftUI.swift
[49/50] Compiling CombineSchedulers TestScheduler.swift
[50/50] Emitting module CombineSchedulers
Build complete! (14.82s)
Fetching https://github.com/pointfreeco/xctest-dynamic-overlay from cache
Fetching https://github.com/pointfreeco/swift-concurrency-extras from cache
Fetched https://github.com/pointfreeco/swift-concurrency-extras from cache (0.44s)
Fetched https://github.com/pointfreeco/xctest-dynamic-overlay from cache (0.44s)
Computing version for https://github.com/pointfreeco/swift-concurrency-extras
Computed https://github.com/pointfreeco/swift-concurrency-extras at 1.3.1 (0.98s)
Computing version for https://github.com/pointfreeco/xctest-dynamic-overlay
Computed https://github.com/pointfreeco/xctest-dynamic-overlay at 1.5.2 (0.49s)
Creating working copy for https://github.com/pointfreeco/swift-concurrency-extras
Working copy of https://github.com/pointfreeco/swift-concurrency-extras resolved at 1.3.1
Creating working copy for https://github.com/pointfreeco/xctest-dynamic-overlay
Working copy of https://github.com/pointfreeco/xctest-dynamic-overlay resolved at 1.5.2
Build complete.
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  "dependencies" : [
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      "identity" : "swift-concurrency-extras",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/pointfreeco/swift-concurrency-extras"
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    {
      "identity" : "xctest-dynamic-overlay",
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  "manifest_display_name" : "combine-schedulers",
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  "path" : "/Users/admin/builder/spi-builder-workspace",
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  "products" : [
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      "name" : "CombineSchedulers",
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  ],
  "swift_languages_versions" : [
    "6"
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  "targets" : [
    {
      "c99name" : "CombineSchedulersTests",
      "module_type" : "SwiftTarget",
      "name" : "CombineSchedulersTests",
      "path" : "Tests/CombineSchedulersTests",
      "sources" : [
        "ImmediateSchedulerTests.swift",
        "TestSchedulerTests.swift",
        "TimerTests.swift",
        "UISchedulerTests.swift",
        "UnimplementedSchedulerTests.swift"
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      "target_dependencies" : [
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        "Internal/Lock.swift",
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        "SwiftUI.swift",
        "TestScheduler.swift",
        "Timer.swift",
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        "UIScheduler.swift",
        "UnimplementedScheduler.swift"
      ],
      "type" : "library"
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  ],
  "tools_version" : "6.0"
}
Done.