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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 Superhighway, reference main (deb5bc), with Swift 6.1 for Linux on 27 Apr 2025 14:44:29 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/rhysforyou/Superhighway.git
Reference: main
Initialized empty Git repository in /host/spi-builder-workspace/.git/
hint: Using 'master' as the name for the initial branch. This default branch name
hint: is subject to change. To configure the initial branch name to use in all
hint: of your new repositories, which will suppress this warning, call:
hint:
hint: 	git config --global init.defaultBranch <name>
hint:
hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
hint: 'development'. The just-created branch can be renamed via this command:
hint:
hint: 	git branch -m <name>
From https://github.com/rhysforyou/Superhighway
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at deb5bcb add support for swift-http-types
Cloned https://github.com/rhysforyou/Superhighway.git
Revision (git rev-parse @):
deb5bcb28b34fa5f9d47f7a9dbc5e7b82a558d2f
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/rhysforyou/Superhighway.git at main
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/rhysforyou/Superhighway.git
https://github.com/rhysforyou/Superhighway.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
    {
      "identity" : "swift-http-types",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.1.0",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-http-types.git"
    },
    {
      "identity" : "swift-docc-plugin",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.2.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-docc-plugin"
    }
  ],
  "manifest_display_name" : "Superhighway",
  "name" : "Superhighway",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "watchos",
      "version" : "8.0"
    },
    {
      "name" : "tvos",
      "version" : "15.0"
    },
    {
      "name" : "macos",
      "version" : "12.0"
    }
  ],
  "products" : [
    {
      "name" : "Superhighway",
      "targets" : [
        "Superhighway"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "SuperhighwayTests",
      "module_type" : "SwiftTarget",
      "name" : "SuperhighwayTests",
      "path" : "Tests/SuperhighwayTests",
      "sources" : [
        "CombineIntegrationTests.swift",
        "ConcurrencyIntegrationTests.swift",
        "EndpointTests.swift",
        "HTTPStubURLProtocol.swift",
        "TestFixtures.swift",
        "URLSessionIntegrationTests.swift"
      ],
      "target_dependencies" : [
        "Superhighway"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Superhighway",
      "module_type" : "SwiftTarget",
      "name" : "Superhighway",
      "path" : "Sources/Superhighway",
      "product_memberships" : [
        "Superhighway"
      ],
      "sources" : [
        "Endpoint.swift",
        "URLSession+Endpoint.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "HTTPTypesSuperhighway",
      "module_type" : "SwiftTarget",
      "name" : "HTTPTypesSuperhighway",
      "path" : "Sources/HTTPTypesSuperhighway",
      "product_dependencies" : [
        "HTTPTypes",
        "HTTPTypesFoundation"
      ],
      "sources" : [
        "Endpoint+HTTPTypes.swift"
      ],
      "target_dependencies" : [
        "Superhighway"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.5"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -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 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Fetching https://github.com/apple/swift-docc-plugin
Fetching https://github.com/apple/swift-http-types.git
[1/904] Fetching swift-http-types
[905/2953] Fetching swift-http-types, swift-docc-plugin
Fetched https://github.com/apple/swift-http-types.git from cache (0.24s)
[246/2049] Fetching swift-docc-plugin
Fetched https://github.com/apple/swift-docc-plugin from cache (0.38s)
Computing version for https://github.com/apple/swift-http-types.git
Computed https://github.com/apple/swift-http-types.git at 0.2.1 (0.92s)
Computing version for https://github.com/apple/swift-docc-plugin
Computed https://github.com/apple/swift-docc-plugin at 1.4.3 (0.57s)
Fetching https://github.com/swiftlang/swift-docc-symbolkit
[1/3375] Fetching swift-docc-symbolkit
Fetched https://github.com/swiftlang/swift-docc-symbolkit from cache (0.35s)
Computing version for https://github.com/swiftlang/swift-docc-symbolkit
Computed https://github.com/swiftlang/swift-docc-symbolkit at 1.0.0 (0.97s)
Creating working copy for https://github.com/swiftlang/swift-docc-symbolkit
Working copy of https://github.com/swiftlang/swift-docc-symbolkit resolved at 1.0.0
Creating working copy for https://github.com/apple/swift-docc-plugin
Working copy of https://github.com/apple/swift-docc-plugin resolved at 1.4.3
Creating working copy for https://github.com/apple/swift-http-types.git
Working copy of https://github.com/apple/swift-http-types.git resolved at 0.2.1
[1/1] Compiling plugin Swift-DocC Preview
[2/2] Compiling plugin Swift-DocC
Building for debugging...
[2/7] Write sources
[6/7] Write swift-version-24593BA9C3E375BF.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[8/17] Emitting module Superhighway
/host/spi-builder-workspace/Sources/Superhighway/URLSession+Endpoint.swift:3:8: error: non-nominal type 'URLSession' (aka 'AnyObject') cannot be extended
  1 | import Foundation
  2 |
  3 | public extension URLSession {
    |        `- error: non-nominal type 'URLSession' (aka 'AnyObject') cannot be extended
  4 |   /// Loads an endpoint by creating (and directly resuming) a data task.
  5 |   ///
[9/17] Compiling HTTPTypes ISOLatin1String.swift
[10/17] Compiling HTTPTypes HTTPRequest.swift
[11/17] Compiling HTTPTypes HTTPResponse.swift
[12/17] Compiling HTTPTypes HTTPFieldName.swift
[13/17] Compiling HTTPTypes HTTPField.swift
[14/17] Emitting module HTTPTypes
[15/17] Compiling HTTPTypes HTTPFields.swift
[17/18] Compiling Superhighway Endpoint.swift
[18/18] Compiling Superhighway URLSession+Endpoint.swift
/host/spi-builder-workspace/Sources/Superhighway/URLSession+Endpoint.swift:3:8: error: non-nominal type 'URLSession' (aka 'AnyObject') cannot be extended
  1 | import Foundation
  2 |
  3 | public extension URLSession {
    |        `- error: non-nominal type 'URLSession' (aka 'AnyObject') cannot be extended
  4 |   /// Loads an endpoint by creating (and directly resuming) a data task.
  5 |   ///
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
[0/1] Planning build
[1/1] Compiling plugin Swift-DocC Preview
[2/2] Compiling plugin Swift-DocC
Building for debugging...
[2/3] Write swift-version-24593BA9C3E375BF.txt
[4/13] Compiling Superhighway URLSession+Endpoint.swift
/host/spi-builder-workspace/Sources/Superhighway/URLSession+Endpoint.swift:3:8: error: non-nominal type 'URLSession' (aka 'AnyObject') cannot be extended
  1 | import Foundation
  2 |
  3 | public extension URLSession {
    |        `- error: non-nominal type 'URLSession' (aka 'AnyObject') cannot be extended
  4 |   /// Loads an endpoint by creating (and directly resuming) a data task.
  5 |   ///
error: emit-module command failed with exit code 1 (use -v to see invocation)
[5/13] Emitting module Superhighway
/host/spi-builder-workspace/Sources/Superhighway/URLSession+Endpoint.swift:3:8: error: non-nominal type 'URLSession' (aka 'AnyObject') cannot be extended
  1 | import Foundation
  2 |
  3 | public extension URLSession {
    |        `- error: non-nominal type 'URLSession' (aka 'AnyObject') cannot be extended
  4 |   /// Loads an endpoint by creating (and directly resuming) a data task.
  5 |   ///
[6/13] Compiling Superhighway Endpoint.swift
BUILD FAILURE 6.1 linux