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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 Palette with Swift 6.1 for watchOS using Xcode 16.3.

Build Command

Build command unavailable

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/rwbutler/typographykitpalette.git
Reference: 1.2.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/rwbutler/typographykitpalette
 * tag               1.2.1      -> FETCH_HEAD
HEAD is now at 5afad29 Release 1.2.1
Cloned https://github.com/rwbutler/typographykitpalette.git
Revision (git rev-parse @):
5afad29f0589f8759b0effc34eeca133fa2aea28
SUCCESS checkout https://github.com/rwbutler/typographykitpalette.git at 1.2.1
========================================
Build
========================================
Selected platform:         watchOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/rwbutler/typographykitpalette.git
https://github.com/rwbutler/typographykitpalette.git
{
  "dependencies" : [
    {
      "identity" : "lettercase",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.6.1",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/rwbutler/LetterCase.git"
    }
  ],
  "manifest_display_name" : "Palette",
  "name" : "Palette",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.13"
    }
  ],
  "products" : [
    {
      "name" : "Palette",
      "targets" : [
        "TypographyKitPalette"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "TypographyKitPalette",
      "module_type" : "SwiftTarget",
      "name" : "TypographyKitPalette",
      "path" : "TypographyKitPalette",
      "product_dependencies" : [
        "LetterCase"
      ],
      "product_memberships" : [
        "Palette"
      ],
      "sources" : [
        "Extensions/NSColorAdditions.swift",
        "Extensions/RegularExpressionMatchable.swift",
        "Extensions/String+RegularExpressionMatchable.swift",
        "Services/Command Line/Implementation/CommandLineProcessor.swift",
        "Services/Command Line/Model/CommandLineArgument.swift",
        "Services/Command Line/Model/ConfigurationType.swift",
        "Services/Command Line/Model/TypographyKit.swift",
        "Services/Export/ExportingService.swift",
        "Services/Export/Implementation/AssetCatalogExportingService.swift",
        "Services/Export/Implementation/CatalogColor.swift",
        "Services/Export/Implementation/ColorPaletteExportingService.swift",
        "Services/Parsing/Implementation/ColorParser.swift",
        "Services/Parsing/Implementation/JSONParsingService.swift",
        "Services/Parsing/Implementation/PropertyListParsingService.swift",
        "Services/Parsing/Model/ParsingServiceResult.swift",
        "Services/Parsing/Model/TypographyColor.swift",
        "Services/Parsing/Model/TypographyInterfaceStyle.swift",
        "Services/Parsing/ParsingError.swift",
        "Services/Parsing/ParsingService.swift",
        "Shared/main.swift"
      ],
      "type" : "executable"
    }
  ],
  "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
Resolve Package Graph
Fetching from https://github.com/rwbutler/lettercase
Creating working copy of package ‘lettercase’
Checking out 1.2.0 of package ‘lettercase’
Resolved source packages:
  LetterCase: https://github.com/rwbutler/lettercase @ 1.2.0
resolved source packages: LetterCase
{
  "dependencies" : [
    {
      "identity" : "lettercase",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.6.1",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/rwbutler/LetterCase.git"
    }
  ],
  "manifest_display_name" : "Palette",
  "name" : "Palette",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.13"
    }
  ],
  "products" : [
    {
      "name" : "Palette",
      "targets" : [
        "TypographyKitPalette"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "TypographyKitPalette",
      "module_type" : "SwiftTarget",
      "name" : "TypographyKitPalette",
      "path" : "TypographyKitPalette",
      "product_dependencies" : [
        "LetterCase"
      ],
      "product_memberships" : [
        "Palette"
      ],
      "sources" : [
        "Extensions/NSColorAdditions.swift",
        "Extensions/RegularExpressionMatchable.swift",
        "Extensions/String+RegularExpressionMatchable.swift",
        "Services/Command Line/Implementation/CommandLineProcessor.swift",
        "Services/Command Line/Model/CommandLineArgument.swift",
        "Services/Command Line/Model/ConfigurationType.swift",
        "Services/Command Line/Model/TypographyKit.swift",
        "Services/Export/ExportingService.swift",
        "Services/Export/Implementation/AssetCatalogExportingService.swift",
        "Services/Export/Implementation/CatalogColor.swift",
        "Services/Export/Implementation/ColorPaletteExportingService.swift",
        "Services/Parsing/Implementation/ColorParser.swift",
        "Services/Parsing/Implementation/JSONParsingService.swift",
        "Services/Parsing/Implementation/PropertyListParsingService.swift",
        "Services/Parsing/Model/ParsingServiceResult.swift",
        "Services/Parsing/Model/TypographyColor.swift",
        "Services/Parsing/Model/TypographyInterfaceStyle.swift",
        "Services/Parsing/ParsingError.swift",
        "Services/Parsing/ParsingService.swift",
        "Shared/main.swift"
      ],
      "type" : "executable"
    }
  ],
  "tools_version" : "5.0"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "TypographyKitPalette",
    "schemes" : [
      "TypographyKitPalette"
    ],
    "targets" : [
      "palette"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme TypographyKitPalette -destination generic/platform=watchOS 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 TypographyKitPalette -destination generic/platform=watchOS "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
Resolve Package Graph
Resolved source packages:
  LetterCase: https://github.com/rwbutler/lettercase @ 1.2.0
2025-04-27 01:48:21.887 xcodebuild[688:3789] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-27-04_01-48-0021.xcresult
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
		{ generic:1, platform:watchOS }
	Available destinations for the "TypographyKitPalette" scheme:
		{ platform:macOS, arch:arm64, id:2ae9df957b11ea59cb97b7a862780321ad3e9059, name:My Mac }
		{ platform:macOS, arch:x86_64, id:2ae9df957b11ea59cb97b7a862780321ad3e9059, name:My Mac }
		{ platform:macOS, name:Any Mac }
INFRASTRUCTURE ERROR (status: destinationUnavailable