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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 main (52a1f6), with Swift 6.1 for macOS (SPM) on 30 Apr 2025 12:09:34 UTC.

Swift 6 data race errors: 4

Build Command

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

Build Log

========================================
RunAll
========================================
Builder version: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/ShaftUI/swift-collections.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/ShaftUI/swift-collections
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 52a1f69 Merge pull request #426 from apple/github-actions-ci-support
Cloned https://github.com/ShaftUI/swift-collections.git
Revision (git rev-parse @):
52a1f698d5faa632df0e1219b1bbffa07cf65260
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/ShaftUI/swift-collections.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/ShaftUI/swift-collections.git
https://github.com/ShaftUI/swift-collections.git
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        "TreeDictionary/TreeDictionary+Descriptions.swift",
        "TreeDictionary/TreeDictionary+Equatable.swift",
        "TreeDictionary/TreeDictionary+ExpressibleByDictionaryLiteral.swift",
        "TreeDictionary/TreeDictionary+Filter.swift",
        "TreeDictionary/TreeDictionary+Hashable.swift",
        "TreeDictionary/TreeDictionary+Initializers.swift",
        "TreeDictionary/TreeDictionary+Keys.swift",
        "TreeDictionary/TreeDictionary+MapValues.swift",
        "TreeDictionary/TreeDictionary+Merge.swift",
        "TreeDictionary/TreeDictionary+Sendable.swift",
        "TreeDictionary/TreeDictionary+Sequence.swift",
        "TreeDictionary/TreeDictionary+Values.swift",
        "TreeDictionary/TreeDictionary.swift",
        "TreeSet/TreeSet+Codable.swift",
        "TreeSet/TreeSet+Collection.swift",
        "TreeSet/TreeSet+CustomReflectable.swift",
        "TreeSet/TreeSet+Debugging.swift",
        "TreeSet/TreeSet+Descriptions.swift",
        "TreeSet/TreeSet+Equatable.swift",
        "TreeSet/TreeSet+ExpressibleByArrayLiteral.swift",
        "TreeSet/TreeSet+Extras.swift",
        "TreeSet/TreeSet+Filter.swift",
        "TreeSet/TreeSet+Hashable.swift",
        "TreeSet/TreeSet+Sendable.swift",
        "TreeSet/TreeSet+Sequence.swift",
        "TreeSet/TreeSet+SetAlgebra Initializers.swift",
        "TreeSet/TreeSet+SetAlgebra basics.swift",
        "TreeSet/TreeSet+SetAlgebra formIntersection.swift",
        "TreeSet/TreeSet+SetAlgebra formSymmetricDifference.swift",
        "TreeSet/TreeSet+SetAlgebra formUnion.swift",
        "TreeSet/TreeSet+SetAlgebra intersection.swift",
        "TreeSet/TreeSet+SetAlgebra isDisjoint.swift",
        "TreeSet/TreeSet+SetAlgebra isEqualSet.swift",
        "TreeSet/TreeSet+SetAlgebra isStrictSubset.swift",
        "TreeSet/TreeSet+SetAlgebra isStrictSuperset.swift",
        "TreeSet/TreeSet+SetAlgebra isSubset.swift",
        "TreeSet/TreeSet+SetAlgebra isSuperset.swift",
        "TreeSet/TreeSet+SetAlgebra subtract.swift",
        "TreeSet/TreeSet+SetAlgebra subtracting.swift",
        "TreeSet/TreeSet+SetAlgebra symmetricDifference.swift",
        "TreeSet/TreeSet+SetAlgebra union.swift",
        "TreeSet/TreeSet.swift"
      ],
      "target_dependencies" : [
        "InternalCollectionsUtilities"
      ],
      "type" : "library"
    },
    {
      "c99name" : "DequeTests",
      "module_type" : "SwiftTarget",
      "name" : "DequeTests",
      "path" : "Tests/DequeTests",
      "sources" : [
        "DequeInternals.swift",
        "DequeTests.swift",
        "MutableCollectionTests.swift",
        "RangeReplaceableCollectionTests.swift"
      ],
      "target_dependencies" : [
        "DequeModule",
        "_CollectionsTestSupport"
      ],
      "type" : "test"
    },
    {
      "c99name" : "DequeModule",
      "module_type" : "SwiftTarget",
      "name" : "DequeModule",
      "path" : "Sources/DequeModule",
      "product_memberships" : [
        "DequeModule",
        "Collections"
      ],
      "sources" : [
        "Deque+Codable.swift",
        "Deque+Collection.swift",
        "Deque+CustomReflectable.swift",
        "Deque+Descriptions.swift",
        "Deque+Equatable.swift",
        "Deque+ExpressibleByArrayLiteral.swift",
        "Deque+Extras.swift",
        "Deque+Hashable.swift",
        "Deque+Sendable.swift",
        "Deque+Testing.swift",
        "Deque._Storage.swift",
        "Deque._UnsafeHandle.swift",
        "Deque.swift",
        "_DequeBuffer.swift",
        "_DequeBufferHeader.swift",
        "_DequeSlot.swift",
        "_UnsafeWrappedBuffer.swift"
      ],
      "target_dependencies" : [
        "InternalCollectionsUtilities"
      ],
      "type" : "library"
    },
    {
      "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",
        "SortedCollections"
      ],
      "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 ...
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...
[0/11] Write sources
[10/11] Write swift-version-2F0A5646E1D333AE.txt
[12/29] Compiling InternalCollectionsUtilities UnsafeBufferPointer+Extras.swift
[13/29] Compiling InternalCollectionsUtilities RandomAccessCollection+Offsets.swift
[14/29] Compiling InternalCollectionsUtilities Specialize.swift
[15/30] Compiling InternalCollectionsUtilities _SortedCollection.swift
[16/30] Compiling InternalCollectionsUtilities _UniqueCollection.swift
[17/30] Compiling InternalCollectionsUtilities UInt+reversed.swift
[18/30] Compiling InternalCollectionsUtilities _UnsafeBitSet+Index.swift
[19/30] Compiling InternalCollectionsUtilities Debugging.swift
[20/30] Compiling InternalCollectionsUtilities Descriptions.swift
[21/30] Compiling InternalCollectionsUtilities UnsafeMutableBufferPointer+Extras.swift
[22/30] Compiling InternalCollectionsUtilities Integer rank.swift
[23/30] Compiling InternalCollectionsUtilities UInt+first and last set bit.swift
[24/30] Compiling InternalCollectionsUtilities _UnsafeBitSet+_Word.swift
[25/30] Compiling InternalCollectionsUtilities _UnsafeBitSet.swift
[26/30] Compiling InternalCollectionsUtilities UnsafeMutableBufferPointer+SE-0370.swift
[27/30] Compiling InternalCollectionsUtilities UnsafeMutablePointer+SE-0370.swift
[28/30] Compiling InternalCollectionsUtilities UnsafeRawPointer extensions.swift
[29/30] Compiling InternalCollectionsUtilities FixedWidthInteger+roundUpToPowerOfTwo.swift
[30/30] Emitting module InternalCollectionsUtilities
[31/399] Compiling DequeModule _DequeSlot.swift
[32/399] Compiling DequeModule _DequeBufferHeader.swift
[33/400] Compiling HeapModule Heap+ExpressibleByArrayLiteral.swift
[34/400] Compiling HeapModule Heap+Descriptions.swift
[35/400] Compiling HeapModule _HeapNode.swift
[36/400] Compiling HeapModule Heap+Invariants.swift
[37/400] Compiling HeapModule Heap.swift
[38/400] Compiling HeapModule Heap+UnsafeHandle.swift
[39/400] Emitting module HeapModule
[40/400] Compiling HashTreeCollections _HashNode+Structural union.swift
[41/400] Compiling HashTreeCollections _HashNode+Subtree Insertions.swift
[42/400] Compiling HashTreeCollections _HashNode+Subtree Modify.swift
[43/400] Compiling HashTreeCollections _HashNode+Subtree Removals.swift
[44/400] Compiling HashTreeCollections _HashNode+UnsafeHandle.swift
[45/400] Compiling HashTreeCollections _HashNode.swift
[46/400] Compiling HashTreeCollections _HashNodeHeader.swift
[47/400] Compiling HashTreeCollections _HashSlot.swift
[48/400] Compiling HashTreeCollections _HashStack.swift
[49/400] Compiling HashTreeCollections _HashTreeIterator.swift
[50/400] Compiling HashTreeCollections _HashTreeStatistics.swift
[51/400] Compiling HashTreeCollections _RawHashNode+UnsafeHandle.swift
[52/405] Compiling DequeModule _UnsafeWrappedBuffer.swift
[53/405] Compiling OrderedCollections OrderedSet+Partial SetAlgebra formIntersection.swift
[54/405] Compiling OrderedCollections OrderedSet+Partial SetAlgebra formSymmetricDifference.swift
[55/405] Compiling OrderedCollections OrderedSet+Partial SetAlgebra formUnion.swift
[56/405] Compiling _RopeModule BigString+UnicodeScalarView.swift
[57/405] Compiling _RopeModule BigSubstring+UTF16View.swift
[58/405] Compiling _RopeModule BigSubstring+UTF8View.swift
[62/411] Compiling _RopeModule BigSubstring+UnicodeScalarView.swift
[63/411] Compiling _RopeModule BigSubstring.swift
[64/411] Compiling HashTreeCollections TreeDictionary+ExpressibleByDictionaryLiteral.swift
[65/411] Compiling HashTreeCollections TreeDictionary+Filter.swift
[66/411] Compiling HashTreeCollections TreeDictionary+Hashable.swift
[67/411] Compiling HashTreeCollections TreeDictionary+Initializers.swift
[68/411] Compiling HashTreeCollections TreeDictionary+Keys.swift
[76/416] Compiling SortedCollections SortedSet+SubSequence.swift
[77/416] Compiling SortedCollections SortedSet+Subscripts.swift
[78/416] Compiling SortedCollections SortedSet.Index.swift
[79/416] Compiling SortedCollections SortedSet.swift
[80/416] Compiling SortedCollections Assertions.swift
[81/416] Compiling HashTreeCollections _RawHashNode.swift
[90/416] Compiling HashTreeCollections TreeSet+Equatable.swift
[91/416] Compiling HashTreeCollections TreeSet+ExpressibleByArrayLiteral.swift
[93/416] Compiling HashTreeCollections TreeSet+Extras.swift
[95/416] Compiling HashTreeCollections TreeSet+Filter.swift
[97/416] Compiling HashTreeCollections TreeSet+Hashable.swift
[98/416] Compiling HashTreeCollections TreeSet+Sendable.swift
[99/416] Compiling HashTreeCollections TreeSet+Sequence.swift
[100/416] Compiling HashTreeCollections TreeSet+SetAlgebra Initializers.swift
[101/416] Compiling HashTreeCollections TreeSet+SetAlgebra basics.swift
[102/416] Compiling HashTreeCollections TreeSet+SetAlgebra formIntersection.swift
[103/416] Compiling HashTreeCollections TreeSet+SetAlgebra formSymmetricDifference.swift
[104/416] Compiling HashTreeCollections TreeSet+SetAlgebra formUnion.swift
[105/416] Compiling HashTreeCollections TreeSet+SetAlgebra intersection.swift
[106/416] Compiling HashTreeCollections TreeSet+SetAlgebra isDisjoint.swift
[107/416] Compiling HashTreeCollections TreeSet+SetAlgebra isEqualSet.swift
[108/416] Compiling HashTreeCollections TreeSet+SetAlgebra isStrictSubset.swift
[109/424] Emitting module BitCollections
[110/424] Compiling HashTreeCollections _HashNode+Storage.swift
[111/424] Compiling HashTreeCollections _HashNode+Structural compactMapValues.swift
[112/424] Compiling HashTreeCollections _HashNode+Structural filter.swift
[113/424] Compiling HashTreeCollections _HashNode+Structural intersection.swift
[114/424] Compiling HashTreeCollections _HashNode+Structural isDisjoint.swift
[115/424] Compiling HashTreeCollections _HashNode+Structural isEqualSet.swift
[126/424] Compiling HashTreeCollections _HashNode+Initializers.swift
[127/424] Compiling HashTreeCollections _HashNode+Invariants.swift
[128/424] Compiling HashTreeCollections _HashNode+Lookups.swift
[129/424] Compiling HashTreeCollections _HashNode+Primitive Insertions.swift
[130/424] Compiling HashTreeCollections _HashNode+Primitive Removals.swift
[131/424] Compiling HashTreeCollections _HashNode+Primitive Replacement.swift
[144/424] Compiling HashTreeCollections _HashNode+Debugging.swift
[152/424] Compiling HashTreeCollections _AncestorHashSlots.swift
[153/424] Compiling HashTreeCollections _Bitmap.swift
[154/424] Compiling HashTreeCollections _HashLevel.swift
[155/424] Compiling HashTreeCollections _HashNode+Builder.swift
/Users/admin/builder/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 |     @objc @inlinable deinit
/Users/admin/builder/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 |     @objc @inlinable deinit
[158/424] Compiling HashTreeCollections _Bucket.swift
/Users/admin/builder/spi-builder-workspace/Sources/DequeModule/Deque+Collection.swift:26:18: warning: stored property '_storage' of 'Sendable'-conforming struct 'Iterator' has non-sendable type 'Deque<Element>._Storage'; this is an error in the Swift 6 language mode
 24 |   public struct Iterator: IteratorProtocol {
 25 |     @usableFromInline
 26 |     internal var _storage: Deque._Storage
    |                  `- warning: stored property '_storage' of 'Sendable'-conforming struct 'Iterator' has non-sendable type 'Deque<Element>._Storage'; this is an error in the Swift 6 language mode
 27 |
 28 |     @usableFromInline
/Users/admin/builder/spi-builder-workspace/Sources/DequeModule/Deque._Storage.swift:15:10: note: consider making struct '_Storage' conform to the 'Sendable' protocol
 13 |   @frozen
 14 |   @usableFromInline
 15 |   struct _Storage {
    |          `- note: consider making struct '_Storage' conform to the 'Sendable' protocol
 16 |     @usableFromInline
 17 |     internal typealias _Buffer = ManagedBufferPointer<_DequeBufferHeader, Element>
[159/424] Compiling HashTreeCollections _Hash.swift
/Users/admin/builder/spi-builder-workspace/Sources/DequeModule/Deque+Collection.swift:26:18: warning: stored property '_storage' of 'Sendable'-conforming struct 'Iterator' has non-sendable type 'Deque<Element>._Storage'; this is an error in the Swift 6 language mode
 24 |   public struct Iterator: IteratorProtocol {
 25 |     @usableFromInline
 26 |     internal var _storage: Deque._Storage
    |                  `- warning: stored property '_storage' of 'Sendable'-conforming struct 'Iterator' has non-sendable type 'Deque<Element>._Storage'; this is an error in the Swift 6 language mode
 27 |
 28 |     @usableFromInline
/Users/admin/builder/spi-builder-workspace/Sources/DequeModule/Deque._Storage.swift:15:10: note: consider making struct '_Storage' conform to the 'Sendable' protocol
 13 |   @frozen
 14 |   @usableFromInline
 15 |   struct _Storage {
    |          `- note: consider making struct '_Storage' conform to the 'Sendable' protocol
 16 |     @usableFromInline
 17 |     internal typealias _Buffer = ManagedBufferPointer<_DequeBufferHeader, Element>
[174/424] Compiling OrderedCollections OrderedSet+SubSequence.swift
[175/424] Compiling OrderedCollections OrderedSet+Testing.swift
[176/424] Compiling OrderedCollections OrderedSet+UnorderedView.swift
[177/424] Compiling OrderedCollections OrderedSet+UnstableInternals.swift
[178/424] Compiling OrderedCollections OrderedSet.swift
[179/424] Compiling OrderedCollections _UnsafeBitset.swift
[187/424] Compiling HashTreeCollections _HashNode+Structural isSubset.swift
[188/424] Compiling HashTreeCollections _HashNode+Structural mapValues.swift
[189/424] Compiling HashTreeCollections _HashNode+Structural merge.swift
[190/424] Compiling HashTreeCollections _HashNode+Structural subtracting.swift
[191/424] Compiling HashTreeCollections _HashNode+Structural symmetricDifference.swift
[221/424] Emitting module DequeModule
/Users/admin/builder/spi-builder-workspace/Sources/DequeModule/Deque+Collection.swift:26:18: warning: stored property '_storage' of 'Sendable'-conforming struct 'Iterator' has non-sendable type 'Deque<Element>._Storage'; this is an error in the Swift 6 language mode
 24 |   public struct Iterator: IteratorProtocol {
 25 |     @usableFromInline
 26 |     internal var _storage: Deque._Storage
    |                  `- warning: stored property '_storage' of 'Sendable'-conforming struct 'Iterator' has non-sendable type 'Deque<Element>._Storage'; this is an error in the Swift 6 language mode
 27 |
 28 |     @usableFromInline
/Users/admin/builder/spi-builder-workspace/Sources/DequeModule/Deque._Storage.swift:15:10: note: consider making struct '_Storage' conform to the 'Sendable' protocol
 13 |   @frozen
 14 |   @usableFromInline
 15 |   struct _Storage {
    |          `- note: consider making struct '_Storage' conform to the 'Sendable' protocol
 16 |     @usableFromInline
 17 |     internal typealias _Buffer = ManagedBufferPointer<_DequeBufferHeader, Element>
/Users/admin/builder/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 |     @objc @inlinable deinit
[222/424] Compiling HashTreeCollections TreeSet+SetAlgebra isStrictSuperset.swift
[223/424] Compiling HashTreeCollections TreeSet+SetAlgebra isSubset.swift
[224/424] Compiling HashTreeCollections TreeSet+SetAlgebra isSuperset.swift
[225/424] Compiling HashTreeCollections TreeSet+SetAlgebra subtract.swift
[226/424] Compiling HashTreeCollections TreeSet+SetAlgebra subtracting.swift
[227/424] Compiling HashTreeCollections TreeSet+SetAlgebra symmetricDifference.swift
[228/424] Compiling HashTreeCollections TreeSet+SetAlgebra union.swift
[229/424] Compiling HashTreeCollections TreeSet.swift
[352/431] Emitting module OrderedCollections
/Users/admin/builder/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 |     @objc @inlinable deinit
/Users/admin/builder/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 |     @objc @inlinable deinit
/Users/admin/builder/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 |     @objc @inlinable deinit
/Users/admin/builder/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 |     @objc @inlinable deinit
/Users/admin/builder/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 |     @objc @inlinable deinit
/Users/admin/builder/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 |     @objc @inlinable deinit
/Users/admin/builder/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 |     @objc @inlinable deinit
/Users/admin/builder/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 |     @objc @inlinable deinit
/Users/admin/builder/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 |     @objc @inlinable deinit
[371/431] Emitting module _RopeModule
[372/431] Compiling _RopeModule Rope+Remove.swift
[373/431] Compiling _RopeModule Rope+RemoveSubrange.swift
[374/431] Compiling _RopeModule Rope+Split.swift
[375/431] Compiling _RopeModule Optional Utilities.swift
[376/431] Compiling _RopeModule String Utilities.swift
[377/431] Compiling _RopeModule String.Index+ABI.swift
[378/431] Compiling _RopeModule _CharacterRecognizer.swift
[379/431] Emitting module SortedCollections
[396/431] Emitting module HashTreeCollections
/Users/admin/builder/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 |     @objc @inlinable deinit
[397/433] Emitting module Collections
[398/433] Compiling Collections Collections.swift
[411/436] Compiling _CollectionsTestSupport SetAPIChecker.swift
[412/436] Compiling _CollectionsTestSupport SortedCollectionAPIChecker.swift
[413/436] Compiling _CollectionsTestSupport StringConvertibleValue.swift
[432/436] Emitting module _CollectionsTestSupport
/Users/admin/builder/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() {}
/Users/admin/builder/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() {}
/Users/admin/builder/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() {}
/Users/admin/builder/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() {}
/Users/admin/builder/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! (13.48s)
Build complete.
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Done.