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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 swift-collections, reference 1.1.4 (671108), with Swift 6.1 for Linux on 29 Apr 2025 11:27:03 UTC.

Swift 6 data race errors: 3

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/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

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/apple/swift-collections.git
Reference: 1.1.4
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/apple/swift-collections
 * tag               1.1.4      -> FETCH_HEAD
HEAD is now at 671108c Merge pull request #422 from apple/riscv64
Cloned https://github.com/apple/swift-collections.git
Revision (git rev-parse @):
671108c96644956dddcd89dd59c203dcdb36cec7
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/apple/swift-collections.git at 1.1.4
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/apple/swift-collections.git
https://github.com/apple/swift-collections.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
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    {
      "c99name" : "CollectionsTestSupportTests",
      "module_type" : "SwiftTarget",
      "name" : "CollectionsTestSupportTests",
      "path" : "Tests/CollectionsTestSupportTests",
      "sources" : [
        "CombinatoricsChecks.swift",
        "IndexRangeCollectionTests.swift",
        "MinimalTypeConformances.swift",
        "UtilitiesTests.swift"
      ],
      "target_dependencies" : [
        "_CollectionsTestSupport"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Collections",
      "module_type" : "SwiftTarget",
      "name" : "Collections",
      "path" : "Sources/Collections",
      "product_memberships" : [
        "Collections"
      ],
      "sources" : [
        "Collections.swift"
      ],
      "target_dependencies" : [
        "BitCollections",
        "DequeModule",
        "HashTreeCollections",
        "HeapModule",
        "OrderedCollections",
        "_RopeModule"
      ],
      "type" : "library"
    },
    {
      "c99name" : "BitCollectionsTests",
      "module_type" : "SwiftTarget",
      "name" : "BitCollectionsTests",
      "path" : "Tests/BitCollectionsTests",
      "sources" : [
        "BitArrayTests.swift",
        "BitSet.Counted Tests.swift",
        "BitSetTests.swift"
      ],
      "target_dependencies" : [
        "BitCollections",
        "_CollectionsTestSupport",
        "OrderedCollections"
      ],
      "type" : "test"
    },
    {
      "c99name" : "BitCollections",
      "module_type" : "SwiftTarget",
      "name" : "BitCollections",
      "path" : "Sources/BitCollections",
      "product_memberships" : [
        "BitCollections",
        "Collections"
      ],
      "sources" : [
        "BitArray/BitArray+BitwiseOperations.swift",
        "BitArray/BitArray+ChunkedBitsIterators.swift",
        "BitArray/BitArray+Codable.swift",
        "BitArray/BitArray+Collection.swift",
        "BitArray/BitArray+Copy.swift",
        "BitArray/BitArray+CustomReflectable.swift",
        "BitArray/BitArray+Descriptions.swift",
        "BitArray/BitArray+Equatable.swift",
        "BitArray/BitArray+ExpressibleByArrayLiteral.swift",
        "BitArray/BitArray+ExpressibleByStringLiteral.swift",
        "BitArray/BitArray+Extras.swift",
        "BitArray/BitArray+Fill.swift",
        "BitArray/BitArray+Hashable.swift",
        "BitArray/BitArray+Initializers.swift",
        "BitArray/BitArray+Invariants.swift",
        "BitArray/BitArray+LosslessStringConvertible.swift",
        "BitArray/BitArray+RandomBits.swift",
        "BitArray/BitArray+RangeReplaceableCollection.swift",
        "BitArray/BitArray+Shifts.swift",
        "BitArray/BitArray+Testing.swift",
        "BitArray/BitArray._UnsafeHandle.swift",
        "BitArray/BitArray.swift",
        "BitSet/BitSet+BidirectionalCollection.swift",
        "BitSet/BitSet+Codable.swift",
        "BitSet/BitSet+CustomDebugStringConvertible.swift",
        "BitSet/BitSet+CustomReflectable.swift",
        "BitSet/BitSet+CustomStringConvertible.swift",
        "BitSet/BitSet+Equatable.swift",
        "BitSet/BitSet+ExpressibleByArrayLiteral.swift",
        "BitSet/BitSet+Extras.swift",
        "BitSet/BitSet+Hashable.swift",
        "BitSet/BitSet+Initializers.swift",
        "BitSet/BitSet+Invariants.swift",
        "BitSet/BitSet+Random.swift",
        "BitSet/BitSet+SetAlgebra basics.swift",
        "BitSet/BitSet+SetAlgebra conformance.swift",
        "BitSet/BitSet+SetAlgebra formIntersection.swift",
        "BitSet/BitSet+SetAlgebra formSymmetricDifference.swift",
        "BitSet/BitSet+SetAlgebra formUnion.swift",
        "BitSet/BitSet+SetAlgebra intersection.swift",
        "BitSet/BitSet+SetAlgebra isDisjoint.swift",
        "BitSet/BitSet+SetAlgebra isEqualSet.swift",
        "BitSet/BitSet+SetAlgebra isStrictSubset.swift",
        "BitSet/BitSet+SetAlgebra isStrictSuperset.swift",
        "BitSet/BitSet+SetAlgebra isSubset.swift",
        "BitSet/BitSet+SetAlgebra isSuperset.swift",
        "BitSet/BitSet+SetAlgebra subtract.swift",
        "BitSet/BitSet+SetAlgebra subtracting.swift",
        "BitSet/BitSet+SetAlgebra symmetricDifference.swift",
        "BitSet/BitSet+SetAlgebra union.swift",
        "BitSet/BitSet+Sorted Collection APIs.swift",
        "BitSet/BitSet.Counted.swift",
        "BitSet/BitSet.Index.swift",
        "BitSet/BitSet._UnsafeHandle.swift",
        "BitSet/BitSet.swift",
        "Shared/Range+Utilities.swift",
        "Shared/Slice+Utilities.swift",
        "Shared/UInt+Tricks.swift",
        "Shared/_Word.swift"
      ],
      "target_dependencies" : [
        "InternalCollectionsUtilities"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.7"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/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
Building for debugging...
[0/10] Write sources
[9/10] Write swift-version-24593BA9C3E375BF.txt
[11/27] Emitting module InternalCollectionsUtilities
[12/29] Compiling InternalCollectionsUtilities RandomAccessCollection+Offsets.swift
[13/29] Compiling InternalCollectionsUtilities Specialize.swift
[14/29] Compiling InternalCollectionsUtilities FixedWidthInteger+roundUpToPowerOfTwo.swift
[15/29] Compiling InternalCollectionsUtilities Integer rank.swift
[16/29] Compiling InternalCollectionsUtilities UInt+first and last set bit.swift
[17/29] Compiling InternalCollectionsUtilities _SortedCollection.swift
[18/29] Compiling InternalCollectionsUtilities _UniqueCollection.swift
[19/29] Compiling InternalCollectionsUtilities _UnsafeBitSet+_Word.swift
[20/29] Compiling InternalCollectionsUtilities _UnsafeBitSet.swift
[21/29] Compiling InternalCollectionsUtilities UInt+reversed.swift
[22/29] Compiling InternalCollectionsUtilities _UnsafeBitSet+Index.swift
[23/29] Compiling InternalCollectionsUtilities UnsafeBufferPointer+Extras.swift
[24/29] Compiling InternalCollectionsUtilities UnsafeMutableBufferPointer+Extras.swift
[25/29] Compiling InternalCollectionsUtilities Debugging.swift
[26/29] Compiling InternalCollectionsUtilities Descriptions.swift
[27/29] Compiling InternalCollectionsUtilities UnsafeMutableBufferPointer+SE-0370.swift
[28/29] Compiling InternalCollectionsUtilities UnsafeMutablePointer+SE-0370.swift
[29/29] Compiling InternalCollectionsUtilities UnsafeRawPointer extensions.swift
[31/338] Compiling HashTreeCollections _Bucket.swift
[32/338] Compiling HashTreeCollections _Hash.swift
[33/340] Compiling HashTreeCollections _HashNode+Primitive Replacement.swift
/host/spi-builder-workspace/Sources/DequeModule/_DequeBuffer.swift:44:14: warning: let '_emptyDequeStorage' is not concurrency-safe because non-'Sendable' type 'ManagedBuffer<_DequeBufferHeader, Void>' may have shared mutable state; this is an error in the Swift 6 language mode
42 | /// The type-punned empty singleton storage instance.
43 | @usableFromInline
44 | internal let _emptyDequeStorage = _DequeBuffer<Void>.create(
   |              |- warning: let '_emptyDequeStorage' is not concurrency-safe because non-'Sendable' type 'ManagedBuffer<_DequeBufferHeader, Void>' may have shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: add '@MainActor' to make let '_emptyDequeStorage' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
45 |   minimumCapacity: 0,
46 |   makingHeaderWith: { _ in
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
[34/340] Compiling HashTreeCollections _HashNode+Storage.swift
/host/spi-builder-workspace/Sources/DequeModule/_DequeBuffer.swift:44:14: warning: let '_emptyDequeStorage' is not concurrency-safe because non-'Sendable' type 'ManagedBuffer<_DequeBufferHeader, Void>' may have shared mutable state; this is an error in the Swift 6 language mode
42 | /// The type-punned empty singleton storage instance.
43 | @usableFromInline
44 | internal let _emptyDequeStorage = _DequeBuffer<Void>.create(
   |              |- warning: let '_emptyDequeStorage' is not concurrency-safe because non-'Sendable' type 'ManagedBuffer<_DequeBufferHeader, Void>' may have shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: add '@MainActor' to make let '_emptyDequeStorage' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
45 |   minimumCapacity: 0,
46 |   makingHeaderWith: { _ in
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
[35/340] Compiling HeapModule _HeapNode.swift
[36/340] Compiling HeapModule Heap.swift
[37/340] Emitting module HeapModule
[38/340] Compiling HashTreeCollections _HashLevel.swift
[39/340] Compiling HashTreeCollections _HashNode+Builder.swift
[40/340] Compiling HeapModule Heap+ExpressibleByArrayLiteral.swift
[41/340] Compiling HeapModule Heap+Descriptions.swift
[42/340] Compiling HeapModule Heap+Invariants.swift
[43/340] Compiling HeapModule Heap+UnsafeHandle.swift
[45/341] Compiling HashTreeCollections _HashNode+Structural union.swift
[46/341] Compiling HashTreeCollections _HashNode+Subtree Insertions.swift
[47/341] Compiling HashTreeCollections _HashNode+Subtree Modify.swift
[48/341] Compiling HashTreeCollections _HashNode+Subtree Removals.swift
[49/341] Compiling HashTreeCollections _HashNode+UnsafeHandle.swift
[50/341] Compiling HashTreeCollections _HashNode.swift
[51/341] Compiling HashTreeCollections _HashNodeHeader.swift
[52/341] Compiling HashTreeCollections _HashSlot.swift
[53/341] Compiling HashTreeCollections _HashStack.swift
[54/341] Compiling HashTreeCollections TreeDictionary+Equatable.swift
[55/341] Compiling HashTreeCollections TreeDictionary+ExpressibleByDictionaryLiteral.swift
[56/341] Compiling HashTreeCollections TreeDictionary+Filter.swift
[57/341] Compiling HashTreeCollections TreeDictionary+Hashable.swift
[58/341] Compiling HashTreeCollections TreeDictionary+Initializers.swift
[59/341] Compiling HashTreeCollections _AncestorHashSlots.swift
[60/341] Compiling HashTreeCollections _Bitmap.swift
[65/341] Compiling HashTreeCollections _HashNode+Debugging.swift
[66/341] Compiling HashTreeCollections _HashNode+Initializers.swift
[67/341] Compiling HashTreeCollections TreeDictionary+Merge.swift
[68/341] Compiling HashTreeCollections TreeDictionary+Sendable.swift
[69/341] Compiling HashTreeCollections TreeDictionary+Sequence.swift
[70/341] Compiling HashTreeCollections TreeDictionary+Values.swift
[71/341] Compiling HashTreeCollections TreeDictionary.swift
[72/341] Compiling HashTreeCollections TreeSet+Codable.swift
[73/341] Compiling HashTreeCollections TreeSet+Collection.swift
[74/341] Compiling HashTreeCollections TreeSet+Hashable.swift
[75/341] Compiling HashTreeCollections TreeSet+Sendable.swift
[76/341] Compiling HashTreeCollections TreeSet+Sequence.swift
[77/341] Compiling HashTreeCollections TreeSet+SetAlgebra Initializers.swift
[78/341] Compiling HashTreeCollections TreeSet+SetAlgebra basics.swift
[79/341] Compiling HashTreeCollections TreeSet+SetAlgebra formIntersection.swift
[80/341] Compiling HashTreeCollections TreeSet+SetAlgebra formSymmetricDifference.swift
[81/341] Compiling HashTreeCollections TreeSet+SetAlgebra formUnion.swift
[82/341] Compiling HashTreeCollections TreeSet+SetAlgebra intersection.swift
[83/341] Compiling HashTreeCollections TreeSet+SetAlgebra isDisjoint.swift
[84/365] Compiling HashTreeCollections TreeSet+CustomReflectable.swift
[85/365] Compiling HashTreeCollections TreeSet+Debugging.swift
[86/365] Compiling HashTreeCollections TreeSet+Descriptions.swift
[87/365] Compiling HashTreeCollections TreeSet+Equatable.swift
[88/365] Compiling HashTreeCollections TreeSet+ExpressibleByArrayLiteral.swift
[89/365] Compiling BitCollections BitSet.Index.swift
[90/365] Compiling BitCollections BitSet._UnsafeHandle.swift
[91/365] Compiling DequeModule _DequeSlot.swift
[92/365] Compiling DequeModule _UnsafeWrappedBuffer.swift
[93/365] Emitting module BitCollections
[96/365] Compiling HashTreeCollections _HashNode+Invariants.swift
[97/365] Compiling HashTreeCollections _HashNode+Lookups.swift
[98/365] Compiling HashTreeCollections _HashNode+Primitive Insertions.swift
[99/365] Compiling HashTreeCollections _HashNode+Primitive Removals.swift
[112/365] Compiling HashTreeCollections TreeDictionary+Keys.swift
[113/365] Compiling HashTreeCollections TreeDictionary+MapValues.swift
[145/365] Compiling HashTreeCollections _HashNode+Structural intersection.swift
[146/365] Compiling HashTreeCollections _HashNode+Structural isDisjoint.swift
[147/365] Compiling HashTreeCollections _HashNode+Structural isEqualSet.swift
[148/365] Compiling HashTreeCollections _HashNode+Structural isSubset.swift
[149/365] Compiling HashTreeCollections _HashNode+Structural mapValues.swift
[150/365] Compiling HashTreeCollections _HashNode+Structural merge.swift
[151/365] Compiling HashTreeCollections _HashNode+Structural subtracting.swift
[152/365] Compiling HashTreeCollections _HashNode+Structural symmetricDifference.swift
[177/365] Emitting module DequeModule
/host/spi-builder-workspace/Sources/DequeModule/_DequeBuffer.swift:44:14: warning: let '_emptyDequeStorage' is not concurrency-safe because non-'Sendable' type 'ManagedBuffer<_DequeBufferHeader, Void>' may have shared mutable state; this is an error in the Swift 6 language mode
42 | /// The type-punned empty singleton storage instance.
43 | @usableFromInline
44 | internal let _emptyDequeStorage = _DequeBuffer<Void>.create(
   |              |- warning: let '_emptyDequeStorage' is not concurrency-safe because non-'Sendable' type 'ManagedBuffer<_DequeBufferHeader, Void>' may have shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: add '@MainActor' to make let '_emptyDequeStorage' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
45 |   minimumCapacity: 0,
46 |   makingHeaderWith: { _ in
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
[183/366] Compiling OrderedCollections OrderedSet+Sendable.swift
[184/366] Compiling OrderedCollections OrderedSet+SubSequence.swift
[185/366] Compiling OrderedCollections OrderedSet+Testing.swift
[186/366] Compiling OrderedCollections OrderedSet+UnorderedView.swift
[195/375] Compiling _RopeModule _CharacterRecognizer.swift
[196/375] Compiling HashTreeCollections TreeSet+SetAlgebra isStrictSubset.swift
[197/375] Compiling HashTreeCollections TreeSet+SetAlgebra isStrictSuperset.swift
[198/375] Compiling HashTreeCollections TreeSet+SetAlgebra isSubset.swift
[199/375] Compiling HashTreeCollections TreeSet+SetAlgebra isSuperset.swift
[200/375] Compiling HashTreeCollections TreeSet+SetAlgebra subtract.swift
[201/375] Compiling HashTreeCollections TreeSet+SetAlgebra subtracting.swift
[202/375] Compiling HashTreeCollections TreeSet+SetAlgebra symmetricDifference.swift
[203/375] Compiling HashTreeCollections TreeSet+SetAlgebra union.swift
[204/375] Compiling HashTreeCollections TreeSet.swift
[206/375] Compiling HashTreeCollections _HashTreeIterator.swift
[207/375] Compiling HashTreeCollections _HashTreeStatistics.swift
[208/375] Compiling HashTreeCollections _RawHashNode+UnsafeHandle.swift
[209/375] Compiling _RopeModule Rope+Join.swift
[210/375] Compiling _RopeModule Rope+MutatingForEach.swift
[211/375] Compiling _RopeModule Rope+Remove.swift
[212/375] Compiling _RopeModule Rope+RemoveSubrange.swift
[213/375] Compiling _RopeModule Rope+Split.swift
[214/375] Compiling _RopeModule Optional Utilities.swift
[215/375] Compiling _RopeModule String Utilities.swift
[216/375] Compiling _RopeModule String.Index+ABI.swift
[231/375] Compiling OrderedCollections OrderedSet+UnstableInternals.swift
[237/376] Compiling OrderedCollections OrderedSet.swift
[238/376] Compiling OrderedCollections _UnsafeBitset.swift
[269/376] Emitting module OrderedCollections
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
[321/381] Emitting module _RopeModule
[327/381] Compiling _CollectionsTestSupport RepeatableRandomNumberGenerator.swift
[328/381] Compiling _CollectionsTestSupport SetAPIChecker.swift
[329/381] Compiling _CollectionsTestSupport SortedCollectionAPIChecker.swift
[330/381] Compiling _CollectionsTestSupport StringConvertibleValue.swift
[365/382] Emitting module HashTreeCollections
/host/spi-builder-workspace/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift:29:14: warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
 27 | /// clean up after themselves in their `deinit` method.)
 28 | @usableFromInline
 29 | internal let _emptySingleton: _RawHashStorage = _RawHashStorage.create(
    |              |- warning: let '_emptySingleton' is not concurrency-safe because non-'Sendable' type '_RawHashStorage' (aka 'ManagedBuffer<_HashNodeHeader, _RawHashNode>') may have shared mutable state; this is an error in the Swift 6 language mode
    |              |- note: add '@MainActor' to make let '_emptySingleton' part of global actor 'MainActor'
    |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 30 |   minimumCapacity: 0,
 31 |   makingHeaderWith: { _ in _HashNodeHeader(byteCapacity: 0) })
Swift.ManagedBuffer:1:12: note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
1 | open class ManagedBuffer<Header, Element> where Element : ~Copyable {
  |            `- note: generic class 'ManagedBuffer' does not conform to the 'Sendable' protocol
2 |     final public var header: Header
3 |     @inlinable deinit
[368/385] Compiling Collections Collections.swift
[369/385] Emitting module Collections
[371/386] Emitting module _CollectionsTestSupport
/host/spi-builder-workspace/Tests/_CollectionsTestSupport/AssertionContexts/TestContext.swift:23:23: warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 21 |
 22 |   // FIXME: This ought to be a thread-local variable.
 23 |   internal static var _current: TestContext?
    |                       |- warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert '_current' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property '_current' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 24 |
 25 |   public init() {}
/host/spi-builder-workspace/Tests/_CollectionsTestSupport/AssertionContexts/TestContext.swift:23:23: warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 21 |
 22 |   // FIXME: This ought to be a thread-local variable.
 23 |   internal static var _current: TestContext?
    |                       |- warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert '_current' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property '_current' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 24 |
 25 |   public init() {}
/host/spi-builder-workspace/Tests/_CollectionsTestSupport/AssertionContexts/TestContext.swift:23:23: warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 21 |
 22 |   // FIXME: This ought to be a thread-local variable.
 23 |   internal static var _current: TestContext?
    |                       |- warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert '_current' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property '_current' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 24 |
 25 |   public init() {}
/host/spi-builder-workspace/Tests/_CollectionsTestSupport/AssertionContexts/TestContext.swift:23:23: warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 21 |
 22 |   // FIXME: This ought to be a thread-local variable.
 23 |   internal static var _current: TestContext?
    |                       |- warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert '_current' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property '_current' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 24 |
 25 |   public init() {}
/host/spi-builder-workspace/Tests/_CollectionsTestSupport/AssertionContexts/TestContext.swift:23:23: warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 21 |
 22 |   // FIXME: This ought to be a thread-local variable.
 23 |   internal static var _current: TestContext?
    |                       |- warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert '_current' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property '_current' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 24 |
 25 |   public init() {}
/host/spi-builder-workspace/Tests/_CollectionsTestSupport/AssertionContexts/TestContext.swift:23:23: warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 21 |
 22 |   // FIXME: This ought to be a thread-local variable.
 23 |   internal static var _current: TestContext?
    |                       |- warning: static property '_current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert '_current' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property '_current' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 24 |
 25 |   public init() {}
Build complete! (18.47s)
Build complete.
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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
Done.