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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 RSKPlaceholderTextView, reference 8.0.1 (fe0f15), with Swift 6.1 for macOS (SPM) on 30 Apr 2025 03:46:49 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/ruslanskorb/RSKPlaceholderTextView.git
Reference: 8.0.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/ruslanskorb/RSKPlaceholderTextView
 * tag               8.0.1      -> FETCH_HEAD
HEAD is now at fe0f152 Version bump (8.0.1).
Cloned https://github.com/ruslanskorb/RSKPlaceholderTextView.git
Revision (git rev-parse @):
fe0f152cb4cf892cd4893fab50a61e502e5ea033
SUCCESS checkout https://github.com/ruslanskorb/RSKPlaceholderTextView.git at 8.0.1
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/ruslanskorb/RSKPlaceholderTextView.git
https://github.com/ruslanskorb/RSKPlaceholderTextView.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "RSKPlaceholderTextView",
  "name" : "RSKPlaceholderTextView",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "12.0"
    }
  ],
  "products" : [
    {
      "name" : "RSKPlaceholderTextView",
      "targets" : [
        "RSKPlaceholderTextView"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "RSKPlaceholderTextView",
      "module_type" : "SwiftTarget",
      "name" : "RSKPlaceholderTextView",
      "path" : "RSKPlaceholderTextView",
      "product_memberships" : [
        "RSKPlaceholderTextView"
      ],
      "sources" : [
        "RSKPlaceholderTextView.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.7"
}
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 -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/4] Emitting module RSKPlaceholderTextView
/Users/admin/builder/spi-builder-workspace/RSKPlaceholderTextView/RSKPlaceholderTextView.swift:17:8: error: no such module 'UIKit'
 15 | //
 16 |
 17 | import UIKit
    |        `- error: no such module 'UIKit'
 18 |
 19 | /// A light-weight UITextView subclass that adds support for placeholder.
[4/4] Compiling RSKPlaceholderTextView RSKPlaceholderTextView.swift
/Users/admin/builder/spi-builder-workspace/RSKPlaceholderTextView/RSKPlaceholderTextView.swift:17:8: error: no such module 'UIKit'
 15 | //
 16 |
 17 | import UIKit
    |        `- error: no such module 'UIKit'
 18 |
 19 | /// A light-weight UITextView subclass that adds support for placeholder.
warning: 'spi-builder-workspace': found 1 file(s) which are unhandled; explicitly declare them as resources or exclude from the target
    /Users/admin/builder/spi-builder-workspace/RSKPlaceholderTextView/Info.plist
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-2F0A5646E1D333AE.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[2/3] Emitting module RSKPlaceholderTextView
/Users/admin/builder/spi-builder-workspace/RSKPlaceholderTextView/RSKPlaceholderTextView.swift:17:8: error: no such module 'UIKit'
 15 | //
 16 |
 17 | import UIKit
    |        `- error: no such module 'UIKit'
 18 |
 19 | /// A light-weight UITextView subclass that adds support for placeholder.
[3/3] Compiling RSKPlaceholderTextView RSKPlaceholderTextView.swift
/Users/admin/builder/spi-builder-workspace/RSKPlaceholderTextView/RSKPlaceholderTextView.swift:17:8: error: no such module 'UIKit'
 15 | //
 16 |
 17 | import UIKit
    |        `- error: no such module 'UIKit'
 18 |
 19 | /// A light-weight UITextView subclass that adds support for placeholder.
warning: 'spi-builder-workspace': found 1 file(s) which are unhandled; explicitly declare them as resources or exclude from the target
    /Users/admin/builder/spi-builder-workspace/RSKPlaceholderTextView/Info.plist
BUILD FAILURE 6.1 macosSpm