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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 NIOErrorKit, reference 0.0.1 (740848), with Swift 6.0 for macOS (SPM) on 31 Oct 2024 11:15:30 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete

Build Log

========================================
RunAll
========================================
Builder version: 4.56.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/einstore/nioerrorkit.git
Reference: 0.0.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/einstore/nioerrorkit
 * tag               0.0.1      -> FETCH_HEAD
HEAD is now at 7408484 initial upload
Cloned https://github.com/einstore/nioerrorkit.git
Revision (git rev-parse @):
74084844f7def572171311f450cb7d3df0da87c4
SUCCESS checkout https://github.com/einstore/nioerrorkit.git at 0.0.1
Fetching https://github.com/Einstore/WebErrorKit.git
Fetching https://github.com/apple/swift-nio.git
[1/28] Fetching weberrorkit
[25/71126] Fetching weberrorkit, swift-nio
Fetched https://github.com/Einstore/WebErrorKit.git from cache (8.12s)
Fetched https://github.com/apple/swift-nio.git from cache (8.12s)
Computing version for https://github.com/Einstore/WebErrorKit.git
Computed https://github.com/Einstore/WebErrorKit.git at 0.0.1 (0.68s)
Computing version for https://github.com/apple/swift-nio.git
Computed https://github.com/apple/swift-nio.git at 2.4.0 (0.71s)
Creating working copy for https://github.com/Einstore/WebErrorKit.git
Working copy of https://github.com/Einstore/WebErrorKit.git resolved at 0.0.1
Creating working copy for https://github.com/apple/swift-nio.git
Working copy of https://github.com/apple/swift-nio.git resolved at 2.4.0
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "nioerrorkit",
      "name": "NIOErrorKit",
      "url": "https://github.com/einstore/nioerrorkit.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/nioerrorkit",
      "dependencies": [
        {
          "identity": "swift-nio",
          "name": "swift-nio",
          "url": "https://github.com/apple/swift-nio.git",
          "version": "2.76.1",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-nio",
          "dependencies": [
            {
              "identity": "swift-atomics",
              "name": "swift-atomics",
              "url": "https://github.com/apple/swift-atomics.git",
              "version": "1.2.0",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-atomics",
              "dependencies": [
              ]
            },
            {
              "identity": "swift-collections",
              "name": "swift-collections",
              "url": "https://github.com/apple/swift-collections.git",
              "version": "1.1.4",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-collections",
              "dependencies": [
              ]
            },
            {
              "identity": "swift-system",
              "name": "swift-system",
              "url": "https://github.com/apple/swift-system.git",
              "version": "1.4.0",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-system",
              "dependencies": [
              ]
            }
          ]
        },
        {
          "identity": "weberrorkit",
          "name": "WebError",
          "url": "https://github.com/Einstore/WebErrorKit.git",
          "version": "0.0.1",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/WebErrorKit",
          "dependencies": [
          ]
        }
      ]
    }
  ]
}
Fetching https://github.com/einstore/nioerrorkit.git
[2/14] Fetching nioerrorkit
Fetched https://github.com/einstore/nioerrorkit.git from cache (0.65s)
Fetching https://github.com/Einstore/WebErrorKit.git from cache
Fetching https://github.com/apple/swift-nio.git from cache
Fetched https://github.com/apple/swift-nio.git from cache (0.81s)
Fetched https://github.com/Einstore/WebErrorKit.git from cache (0.81s)
Computing version for https://github.com/Einstore/WebErrorKit.git
Computed https://github.com/Einstore/WebErrorKit.git at 0.0.1 (0.02s)
Computing version for https://github.com/apple/swift-nio.git
Computed https://github.com/apple/swift-nio.git at 2.76.1 (0.75s)
Fetching https://github.com/apple/swift-collections.git
Fetching https://github.com/apple/swift-atomics.git
Fetching https://github.com/apple/swift-system.git
[1/1569] Fetching swift-atomics
[64/5470] Fetching swift-atomics, swift-system
[1293/20945] Fetching swift-atomics, swift-system, swift-collections
Fetched https://github.com/apple/swift-collections.git from cache (7.82s)
Fetched https://github.com/apple/swift-system.git from cache (7.83s)
Fetched https://github.com/apple/swift-atomics.git from cache (7.83s)
Computing version for https://github.com/apple/swift-system.git
Computed https://github.com/apple/swift-system.git at 1.4.0 (0.53s)
Computing version for https://github.com/apple/swift-atomics.git
Computed https://github.com/apple/swift-atomics.git at 1.2.0 (0.56s)
Computing version for https://github.com/apple/swift-collections.git
Computed https://github.com/apple/swift-collections.git at 1.1.4 (0.84s)
Creating working copy for https://github.com/Einstore/WebErrorKit.git
Working copy of https://github.com/Einstore/WebErrorKit.git resolved at 0.0.1
Creating working copy for https://github.com/apple/swift-system.git
Working copy of https://github.com/apple/swift-system.git resolved at 1.4.0
Creating working copy for https://github.com/apple/swift-nio.git
Working copy of https://github.com/apple/swift-nio.git resolved at 2.76.1
Creating working copy for https://github.com/apple/swift-collections.git
Working copy of https://github.com/apple/swift-collections.git resolved at 1.1.4
Creating working copy for https://github.com/einstore/nioerrorkit.git
Working copy of https://github.com/einstore/nioerrorkit.git resolved at 0.0.1 (7408484)
Creating working copy for https://github.com/apple/swift-atomics.git
Working copy of https://github.com/apple/swift-atomics.git resolved at 1.2.0
warning: '.resolve-product-dependencies': dependency 'nioerrorkit' is not used by any target
Found 2 product dependencies
  - swift-nio
  - WebError
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $PWD
https://github.com/einstore/nioerrorkit.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete
Building for debugging...
[0/12] Write sources
[5/12] Write swift-version--7754E27361AE5C74.txt
[6/12] Compiling CNIOLinux shim.c
[7/12] Compiling CNIOLinux ifaddrs-android.c
[8/20] Compiling CNIOHTTPParser c_nio_http_parser.c
[9/20] Compiling CNIODarwin shim.c
[10/20] Compiling CNIOSHA1 c_nio_sha1.c
[11/20] Compiling c-atomics.c
[13/23] Compiling NIOConcurrencyHelpers atomics.swift
[14/23] Emitting module NIOConcurrencyHelpers
[15/23] Compiling NIOConcurrencyHelpers lock.swift
[16/74] Compiling WebErrorKit WebErrorContent.swift
[17/74] Compiling NIO ByteBuffer-int.swift
[18/74] Compiling NIO ByteBuffer-views.swift
[19/74] Compiling NIO Channel.swift
[20/74] Compiling NIO ChannelHandler.swift
[21/74] Compiling NIO ChannelHandlers.swift
[22/74] Compiling NIO ChannelInvoker.swift
[23/79] Compiling WebErrorKit WebError.swift
[24/79] Compiling WebErrorKit WebError+RawRepresentable.swift
[25/79] Compiling WebErrorKit WebError+Serializable.swift
[26/79] Compiling WebErrorKit SerializableWebError.swift
[27/79] Compiling NIO SocketOptionProvider.swift
[28/79] Compiling NIO System.swift
[29/79] Compiling NIO Thread.swift
[30/79] Compiling NIO TypeAssistedChannelHandler.swift
[31/79] Compiling NIO Utilities.swift
error: emit-module command failed with exit code 1 (use -v to see invocation)
[32/79] Emitting module NIO
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
[33/79] Compiling NIO Embedded.swift
[34/79] Compiling NIO EventLoop.swift
[35/79] Compiling NIO EventLoopFuture.swift
[36/79] Compiling NIO FileDescriptor.swift
[37/79] Compiling NIO FileHandle.swift
[38/79] Compiling NIO FileRegion.swift
[39/79] Compiling NIO GetaddrinfoResolver.swift
[40/79] Compiling NIO HappyEyeballs.swift
[41/79] Compiling NIO Heap.swift
[42/79] Compiling NIO IO.swift
[43/79] Compiling NIO IOData.swift
[44/79] Compiling NIO IntegerTypes.swift
[45/79] Compiling NIO Selector.swift
[46/79] Compiling NIO ServerSocket.swift
[47/79] Compiling NIO Socket.swift
[48/79] Compiling NIO SocketAddresses.swift
[49/79] Compiling NIO SocketChannel.swift
[50/79] Compiling NIO PendingWritesManager.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/PendingWritesManager.swift:134:27: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
132 |     /// - parameters:
133 |     ///     - bytes: How many bytes of the item were written.
134 |     private mutating func partiallyWrittenFirst(bytes: Int) {
    |                           `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
135 |         self.pendingWrites[self.pendingWrites.startIndex].data.moveReaderIndex(forwardBy: bytes)
136 |         self.subtractOutstanding(bytes: bytes)
[51/79] Compiling NIO PriorityQueue.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/PendingWritesManager.swift:134:27: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
132 |     /// - parameters:
133 |     ///     - bytes: How many bytes of the item were written.
134 |     private mutating func partiallyWrittenFirst(bytes: Int) {
    |                           `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
135 |         self.pendingWrites[self.pendingWrites.startIndex].data.moveReaderIndex(forwardBy: bytes)
136 |         self.subtractOutstanding(bytes: bytes)
[52/79] Compiling NIO RecvByteBufferAllocator.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/PendingWritesManager.swift:134:27: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
132 |     /// - parameters:
133 |     ///     - bytes: How many bytes of the item were written.
134 |     private mutating func partiallyWrittenFirst(bytes: Int) {
    |                           `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
135 |         self.pendingWrites[self.pendingWrites.startIndex].data.moveReaderIndex(forwardBy: bytes)
136 |         self.subtractOutstanding(bytes: bytes)
[53/79] Compiling NIO Resolver.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/PendingWritesManager.swift:134:27: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
132 |     /// - parameters:
133 |     ///     - bytes: How many bytes of the item were written.
134 |     private mutating func partiallyWrittenFirst(bytes: Int) {
    |                           `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
135 |         self.pendingWrites[self.pendingWrites.startIndex].data.moveReaderIndex(forwardBy: bytes)
136 |         self.subtractOutstanding(bytes: bytes)
[54/79] Compiling NIO Selectable.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/PendingWritesManager.swift:134:27: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
132 |     /// - parameters:
133 |     ///     - bytes: How many bytes of the item were written.
134 |     private mutating func partiallyWrittenFirst(bytes: Int) {
    |                           `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
135 |         self.pendingWrites[self.pendingWrites.startIndex].data.moveReaderIndex(forwardBy: bytes)
136 |         self.subtractOutstanding(bytes: bytes)
[55/79] Compiling NIO NIOAny.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/PendingDatagramWritesManager.swift:326:17: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
324 |             while let markedIndex = self.markedIndex, self.pendingWrites.pendingWrites.distance(from: self.index,
325 |                                                                                                 to: markedIndex) >= 0 {
326 |                 let element = self.pendingWrites.pendingWrites[index]
    |                 `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
327 |                 index = self.pendingWrites.pendingWrites.index(after: index)
328 |                 return element
[56/79] Compiling NIO NIOCloseOnErrorHandler.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/PendingDatagramWritesManager.swift:326:17: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
324 |             while let markedIndex = self.markedIndex, self.pendingWrites.pendingWrites.distance(from: self.index,
325 |                                                                                                 to: markedIndex) >= 0 {
326 |                 let element = self.pendingWrites.pendingWrites[index]
    |                 `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
327 |                 index = self.pendingWrites.pendingWrites.index(after: index)
328 |                 return element
[57/79] Compiling NIO NIOThreadPool.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/PendingDatagramWritesManager.swift:326:17: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
324 |             while let markedIndex = self.markedIndex, self.pendingWrites.pendingWrites.distance(from: self.index,
325 |                                                                                                 to: markedIndex) >= 0 {
326 |                 let element = self.pendingWrites.pendingWrites[index]
    |                 `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
327 |                 index = self.pendingWrites.pendingWrites.index(after: index)
328 |                 return element
[58/79] Compiling NIO NonBlockingFileIO.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/PendingDatagramWritesManager.swift:326:17: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
324 |             while let markedIndex = self.markedIndex, self.pendingWrites.pendingWrites.distance(from: self.index,
325 |                                                                                                 to: markedIndex) >= 0 {
326 |                 let element = self.pendingWrites.pendingWrites[index]
    |                 `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
327 |                 index = self.pendingWrites.pendingWrites.index(after: index)
328 |                 return element
[59/79] Compiling NIO PendingDatagramWritesManager.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/PendingDatagramWritesManager.swift:326:17: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
324 |             while let markedIndex = self.markedIndex, self.pendingWrites.pendingWrites.distance(from: self.index,
325 |                                                                                                 to: markedIndex) >= 0 {
326 |                 let element = self.pendingWrites.pendingWrites[index]
    |                 `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
327 |                 index = self.pendingWrites.pendingWrites.index(after: index)
328 |                 return element
[60/79] Compiling NIO Interfaces.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:121:40: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
119 |     /// Returns the marked element.
120 |     @inlinable
121 |     public var markedElement: Element? {
    |                                        `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
122 |         return self.markedElementIndex.map { self._buffer[$0] }
123 |     }
[61/79] Compiling NIO Linux.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:121:40: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
119 |     /// Returns the marked element.
120 |     @inlinable
121 |     public var markedElement: Element? {
    |                                        `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
122 |         return self.markedElementIndex.map { self._buffer[$0] }
123 |     }
[62/79] Compiling NIO LinuxCPUSet.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:121:40: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
119 |     /// Returns the marked element.
120 |     @inlinable
121 |     public var markedElement: Element? {
    |                                        `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
122 |         return self.markedElementIndex.map { self._buffer[$0] }
123 |     }
[63/79] Compiling NIO MarkedCircularBuffer.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:121:40: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
119 |     /// Returns the marked element.
120 |     @inlinable
121 |     public var markedElement: Element? {
    |                                        `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
122 |         return self.markedElementIndex.map { self._buffer[$0] }
123 |     }
[64/79] Compiling NIO MulticastChannel.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: type 'MarkedCircularBuffer<Element>' does not conform to protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:132:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
130 | }
131 |
132 | extension MarkedCircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
133 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
134 |     public typealias Index = CircularBuffer<Element>.Index
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/MarkedCircularBuffer.swift:121:40: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
119 |     /// Returns the marked element.
120 |     @inlinable
121 |     public var markedElement: Element? {
    |                                        `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
122 |         return self.markedElementIndex.map { self._buffer[$0] }
123 |     }
[65/79] Compiling NIO ChannelOption.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
[66/79] Compiling NIO ChannelPipeline.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
[67/79] Compiling NIO CircularBuffer.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
[68/79] Compiling NIO Codec.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
[69/79] Compiling NIO DatagramVectorReadManager.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
[70/79] Compiling NIO DeadChannel.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: type 'CircularBuffer<Element>' does not conform to protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-nio/Sources/NIO/CircularBuffer.swift:106:1: error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
104 |
105 | // MARK: Collection/MutableCollection implementation
106 | extension CircularBuffer: Collection, MutableCollection {
    | `- error: unavailable subscript 'subscript(_:)' was used to satisfy a requirement of protocol 'MutableCollection'
107 |     public typealias RangeType<Bound> = Range<Bound> where Bound: Strideable, Bound.Stride: SignedInteger
108 |     public typealias SubSequence = CircularBuffer<Element>
Swift.MutableCollection:8:12: note: 'subscript(_:)' declared here
 6 |     @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get set }
 7 |     @available(*, unavailable)
 8 |     public subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |            `- note: 'subscript(_:)' declared here
 9 |     @inlinable public mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
10 | }
Swift.MutableCollection:6:14: note: requirement 'subscript(_:)' declared here
 4 |     associatedtype SubSequence
 5 |     override subscript(position: Self.Index) -> Self.Element { get set }
 6 |     override subscript(bounds: Range<Self.Index>) -> Self.SubSequence { get set }
   |              `- note: requirement 'subscript(_:)' declared here
 7 |     mutating func partition(by belongsInSecondPartition: (Self.Element) throws -> Bool) rethrows -> Self.Index
 8 |     mutating func swapAt(_ i: Self.Index, _ j: Self.Index)
[71/79] Compiling NIO AddressedEnvelope.swift
[72/79] Compiling NIO BaseSocket.swift
[73/79] Compiling NIO BaseSocketChannel.swift
[74/79] Compiling NIO Bootstrap.swift
[75/79] Compiling NIO ByteBuffer-aux.swift
[76/79] Compiling NIO ByteBuffer-core.swift
[77/79] Emitting module WebErrorKit
[78/79] Compiling WebErrorKit String+Codify.swift
BUILD FAILURE 6.0 macosSpm