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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

Failed to build XCTest-watchOS with Swift 6.1 for macOS (Xcode) using Xcode 16.3.

Build Command

Build command unavailable

Build Log

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RunAll
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Builder version: 4.61.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/dfed/XCTest-watchOS.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/dfed/XCTest-watchOS
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 4650834 Merge pull request #16 from dfed/dependabot/bundler/rexml-3.3.9
Cloned https://github.com/dfed/XCTest-watchOS.git
Revision (git rev-parse @):
46508340dd973c3a7ac97e3c93a193de2e41f4e6
SUCCESS checkout https://github.com/dfed/XCTest-watchOS.git at master
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Build
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Selected platform:         macosXcodebuild
Swift version:             6.1
Building package at path:  $PWD
https://github.com/dfed/XCTest-watchOS.git
https://github.com/dfed/XCTest-watchOS.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "XCTest-watchOS",
  "name" : "XCTest-watchOS",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "watchos",
      "version" : "2.0"
    }
  ],
  "products" : [
    {
      "name" : "XCTest",
      "targets" : [
        "XCTest"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "4",
    "4.2",
    "5"
  ],
  "targets" : [
    {
      "c99name" : "XCTest",
      "module_type" : "SwiftTarget",
      "name" : "XCTest",
      "path" : "Sources/XCTest",
      "product_memberships" : [
        "XCTest"
      ],
      "sources" : [
        "XCTest+watchOS.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
resolved source packages:
{
  "dependencies" : [
  ],
  "manifest_display_name" : "XCTest-watchOS",
  "name" : "XCTest-watchOS",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "watchos",
      "version" : "2.0"
    }
  ],
  "products" : [
    {
      "name" : "XCTest",
      "targets" : [
        "XCTest"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "4",
    "4.2",
    "5"
  ],
  "targets" : [
    {
      "c99name" : "XCTest",
      "module_type" : "SwiftTarget",
      "name" : "XCTest",
      "path" : "Sources/XCTest",
      "product_memberships" : [
        "XCTest"
      ],
      "sources" : [
        "XCTest+watchOS.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "XCTest",
    "schemes" : [
      "XCTest"
    ],
    "targets" : [
      "XCTest"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme XCTest -destination platform=macOS,arch=arm64 OTHER_SWIFT_FLAGS=-stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme XCTest -destination platform=macOS,arch=arm64 "OTHER_SWIFT_FLAGS=-stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures"
Build settings from command line:
    OTHER_SWIFT_FLAGS = -stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures
2025-04-25 23:36:43.946 xcodebuild[572:3211] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-25-04_23-36-0043.xcresult
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
		{ platform:macOS, arch:arm64 }
	Available destinations for the "XCTest" scheme:
		{ platform:watchOS, id:dvtdevice-DVTiOSDevicePlaceholder-watchos:placeholder, name:Any watchOS Device }
		{ platform:watchOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-watchsimulator:placeholder, name:Any watchOS Simulator Device }
INFRASTRUCTURE ERROR (status: destinationUnavailable