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Build Information

Failed to build Futures with Swift 5.10 for macOS (SPM).

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.3.0-Beta.2.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.29.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/dfunckt/swift-futures.git
Reference: master
Initialized empty Git repository in /Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/dfunckt/swift-futures
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 518a3fd Update for swiftformat 0.47.2
Cloned https://github.com/dfunckt/swift-futures.git
Revision (git rev-parse @):
518a3fddab9feb068391e10302d44181e3653979
SUCCESS checkout https://github.com/dfunckt/swift-futures.git at master
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $workDir
https://github.com/dfunckt/swift-futures.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.3.0-Beta.2.app xcrun swift build --arch arm64
Building for debugging...
[0/5] Write sources
[3/5] Compiling FuturesPrivate Private.c
[4/5] Write swift-version--423B1241ED78D482.txt
[6/27] Compiling FuturesSync Backoff.swift
[7/27] Compiling FuturesSync Locking.swift
[8/27] Compiling FuturesSync PosixConditionLock.swift
[9/30] Compiling FuturesSync AtomicQueue.swift
[10/30] Compiling FuturesSync AtomicBuffer.swift
[11/30] Compiling FuturesSync AtomicList.swift
[12/30] Compiling FuturesSync AtomicMPMCQueue.swift
[13/30] Compiling FuturesSync AtomicMPSCQueue.swift
[14/30] Compiling FuturesSync AtomicSPMCQueue.swift
[15/30] Compiling FuturesSync AtomicSPSCQueue.swift
[16/30] Compiling FuturesSync AtomicUnboundedMPSCQueue.swift
[17/30] Compiling FuturesSync AtomicUnboundedSPSCQueue.swift
[18/30] Compiling FuturesSync PosixLock.swift
[19/30] Compiling FuturesSync SpinLock.swift
[20/30] Compiling FuturesSync UnfairLock.swift
[21/30] Compiling FuturesSync Mutex.swift
[22/30] Compiling FuturesSync Private.swift
[23/30] Compiling FuturesSync Thread.swift
[24/30] Compiling FuturesSync AtomicPointer.swift
[25/30] Compiling FuturesSync AtomicReference.swift
[26/30] Compiling FuturesSync AtomicValue.swift
[27/30] Compiling FuturesSync Atomic.swift
[28/30] Compiling FuturesSync AtomicBitset.swift
[29/30] Compiling FuturesSync AtomicEnum.swift
[30/30] Emitting module FuturesSync
[31/157] Compiling Futures FlattenStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[32/157] Compiling Futures ForEachStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[33/157] Compiling Futures GenerateStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[34/157] Compiling Futures HandleEventsStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[35/157] Compiling Futures JoinStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[36/157] Compiling Futures JustStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[37/157] Compiling Futures LatestStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[38/157] Compiling Futures LazyStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[39/157] Compiling Futures MapKeyPathStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[40/157] Compiling Futures MapResultStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[41/157] Compiling Futures MapStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[42/157] Compiling Futures MatchEitherStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[43/157] Compiling Futures MatchOptionalStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[44/157] Compiling Futures MatchResultStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[45/157] Compiling Futures MergeAllStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[46/157] Compiling Futures MergeStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[47/157] Compiling Futures MulticastStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[48/157] Compiling Futures NeverStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[49/175] Compiling Futures OptionalStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[50/175] Compiling Futures OutputStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[51/175] Compiling Futures PollOnStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[52/175] Compiling Futures PrefixStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[53/175] Compiling Futures PrefixUntilOutputStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[54/175] Compiling Futures PrefixWhileStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[55/175] Compiling Futures PrintStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[56/175] Compiling Futures ReferenceStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[57/175] Compiling Futures RemoveDuplicatesStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[58/175] Compiling Futures RepeatStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[59/175] Compiling Futures ReplaceEmptyStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[60/175] Compiling Futures ReplaceErrorStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[61/175] Compiling Futures ScanStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[62/175] Compiling Futures SequenceStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[63/175] Compiling Futures SetFailureTypeStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[64/175] Compiling Futures ShareStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[65/175] Compiling Futures StreamAllSatisfyFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[66/175] Compiling Futures StreamContainsFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
error: emit-module command failed with exit code 1 (use -v to see invocation)
[67/175] Compiling Futures MatchOptionalFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[68/175] Compiling Futures MatchResultFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[69/175] Compiling Futures NeverFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[70/175] Compiling Futures PeekFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[71/175] Compiling Futures PollOnFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[72/175] Compiling Futures PrintFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[73/175] Compiling Futures ReadyFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[74/175] Compiling Futures ReferenceFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[75/175] Compiling Futures ReplaceErrorFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[76/175] Compiling Futures ReplaceOutputFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[77/175] Compiling Futures SelectAnyFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[78/175] Compiling Futures SelectFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[79/175] Compiling Futures SetFailureTypeFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[80/175] Compiling Futures ThenFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[81/175] Compiling Futures TryLazyFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[82/175] Compiling Futures TryMapFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[83/175] Compiling Futures AdaptiveQueue.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[84/175] Compiling Futures CircularBuffer.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[85/175] Emitting module Futures
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[86/175] Compiling Futures SinkSendFuture.swift
[87/175] Compiling Futures Stream.swift
[88/175] Compiling Futures AbortStream.swift
[89/175] Compiling Futures AssertNoErrorStream.swift
[90/175] Compiling Futures BreakpointStream.swift
[91/175] Compiling Futures BufferStream.swift
[92/175] Compiling Futures CatchErrorStream.swift
[93/175] Compiling Futures CompactMapStream.swift
[94/175] Compiling Futures CompleteOnErrorStream.swift
[95/175] Compiling Futures ConcatenateStream.swift
[96/175] Compiling Futures DropStream.swift
[97/175] Compiling Futures DropUntilOutputStream.swift
[98/175] Compiling Futures DropWhileStream.swift
[99/175] Compiling Futures EmptyStream.swift
[100/175] Compiling Futures EnumerateStream.swift
[101/175] Compiling Futures FilterStream.swift
[102/175] Compiling Futures FlatMapStream.swift
[103/175] Compiling Futures FlattenResultStream.swift
[104/175] Compiling Futures Private.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[105/175] Compiling Futures TaskRunner.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[106/175] Compiling Futures TaskScheduler.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[107/175] Compiling Futures Poll.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[108/175] Compiling Futures Promise.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[109/175] Compiling Futures Result.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[110/175] Compiling Futures Sink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[111/175] Compiling Futures AssertNoErrorSink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[112/175] Compiling Futures BlockingSink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[113/175] Compiling Futures BufferSink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[114/175] Compiling Futures CollectSink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[115/175] Compiling Futures FlatMapInputSink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[116/175] Compiling Futures MapErrorSink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[117/175] Compiling Futures MapInputSink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[118/175] Compiling Futures SetFailureTypeSink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[119/175] Compiling Futures SinkCloseFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[120/175] Compiling Futures SinkFlushFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[121/175] Compiling Futures SinkSendAllFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[122/175] Compiling Futures Future.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[123/175] Compiling Futures AbortFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[124/175] Compiling Futures AssertNoErrorFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[125/175] Compiling Futures BreakpointFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[126/175] Compiling Futures CatchErrorFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[127/175] Compiling Futures FlatMapFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[128/175] Compiling Futures FlattenFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[129/175] Compiling Futures FlattenResultFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[130/175] Compiling Futures FutureStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[131/175] Compiling Futures HandleEventsFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[132/175] Compiling Futures IgnoreOutputFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[133/175] Compiling Futures JoinAllFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[134/175] Compiling Futures JoinFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[135/175] Compiling Futures LazyFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[136/175] Compiling Futures MapFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[137/175] Compiling Futures MapKeyPathFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[138/175] Compiling Futures MapResultFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[139/175] Compiling Futures MatchEitherFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[140/175] Compiling Futures Cancellable.swift
[141/175] Compiling Futures Channel.swift
[142/175] Compiling Futures ChannelImpl.swift
[143/175] Compiling Futures ChannelMPSCBufferBounded.swift
[144/175] Compiling Futures ChannelMPSCBufferUnbounded.swift
[145/175] Compiling Futures ChannelMPSCPark.swift
[146/175] Compiling Futures ChannelSPSCBufferBounded.swift
[147/175] Compiling Futures ChannelSPSCBufferUnbounded.swift
[148/175] Compiling Futures ChannelSPSCPark.swift
[149/175] Compiling Futures ChannelSlotBounded.swift
[150/175] Compiling Futures ChannelSlotUnbounded.swift
[151/175] Compiling Futures Context.swift
[152/175] Compiling Futures Either.swift
[153/175] Compiling Futures Executor.swift
[154/175] Compiling Futures QueueExecutor.swift
[155/175] Compiling Futures RunLoopExecutor.swift
[156/175] Compiling Futures ThreadExecutor.swift
[157/175] Compiling Futures Extensions.swift
[158/175] Compiling Futures StreamContainsWhereFuture.swift
[159/175] Compiling Futures StreamFirstFuture.swift
[160/175] Compiling Futures StreamFirstWhereFuture.swift
[161/175] Compiling Futures StreamForwardFuture.swift
[162/175] Compiling Futures StreamFuture.swift
[163/175] Compiling Futures StreamIgnoreOutputFuture.swift
[164/175] Compiling Futures StreamLastFuture.swift
[165/175] Compiling Futures StreamLastWhereFuture.swift
[166/175] Compiling Futures StreamReduceFuture.swift
[167/175] Compiling Futures StreamReduceIntoFuture.swift
[168/175] Compiling Futures StreamReplayBuffer.swift
[169/175] Compiling Futures SwitchToLatestStream.swift
[170/175] Compiling Futures TryMapStream.swift
[171/175] Compiling Futures UnfoldStream.swift
[172/175] Compiling Futures YieldStream.swift
[173/175] Compiling Futures ZipStream.swift
[174/175] Compiling Futures Task.swift
[175/175] Compiling Futures Waker.swift
error: fatalError
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version--423B1241ED78D482.txt
[2/34] Compiling Futures LatestStream.swift
[3/34] Compiling Futures LazyStream.swift
[4/34] Compiling Futures MapKeyPathStream.swift
[5/34] Compiling Futures MapResultStream.swift
[6/34] Compiling Futures MapStream.swift
[7/34] Compiling Futures MatchEitherStream.swift
[8/34] Compiling Futures MatchOptionalStream.swift
[9/34] Compiling Futures MatchResultStream.swift
[10/45] Compiling Futures IgnoreOutputFuture.swift
[11/45] Compiling Futures JoinAllFuture.swift
[12/45] Compiling Futures JoinFuture.swift
[13/45] Compiling Futures LazyFuture.swift
[14/45] Compiling Futures MapFuture.swift
[15/52] Compiling Futures CatchErrorStream.swift
[16/52] Compiling Futures CompactMapStream.swift
[17/52] Compiling Futures CompleteOnErrorStream.swift
[18/52] Compiling Futures ConcatenateStream.swift
[19/52] Compiling Futures DropStream.swift
[20/52] Compiling Futures DropUntilOutputStream.swift
[21/52] Compiling Futures DropWhileStream.swift
[22/59] Compiling Futures Executor.swift
[23/59] Compiling Futures Extensions.swift
[24/59] Compiling Futures Stream.swift
[25/59] Compiling Futures AbortStream.swift
[26/59] Compiling Futures AssertNoErrorStream.swift
[27/59] Compiling Futures BreakpointStream.swift
[28/59] Compiling Futures BufferStream.swift
[29/66] Compiling Futures MergeAllStream.swift
[30/66] Compiling Futures MergeStream.swift
[31/66] Compiling Futures MulticastStream.swift
[32/66] Compiling Futures NeverStream.swift
[33/73] Compiling Futures EmptyStream.swift
[34/73] Compiling Futures EnumerateStream.swift
[35/73] Compiling Futures FilterStream.swift
[36/73] Compiling Futures FlatMapStream.swift
[37/73] Compiling Futures FlattenResultStream.swift
[38/73] Compiling Futures OptionalStream.swift
[39/73] Compiling Futures OutputStream.swift
[40/79] Compiling Futures GenerateStream.swift
[41/79] Compiling Futures HandleEventsStream.swift
[42/79] Compiling Futures JoinStream.swift
[43/79] Compiling Futures JustStream.swift
[44/85] Compiling Futures PollOnStream.swift
[45/85] Compiling Futures PrefixStream.swift
[46/85] Compiling Futures PrefixUntilOutputStream.swift
[47/85] Compiling Futures PrefixWhileStream.swift
[48/85] Compiling Futures PrintStream.swift
[49/85] Compiling Futures ReferenceStream.swift
[50/85] Compiling Futures RemoveDuplicatesStream.swift
error: emit-module command failed with exit code 1 (use -v to see invocation)
[51/91] Compiling Futures Future.swift
[52/91] Compiling Futures AbortFuture.swift
[53/91] Compiling Futures AssertNoErrorFuture.swift
[54/91] Compiling Futures BreakpointFuture.swift
[55/91] Compiling Futures CatchErrorFuture.swift
[56/91] Emitting module Futures
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[57/91] Compiling Futures FlatMapFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[58/91] Compiling Futures FlattenFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[59/91] Compiling Futures FlattenResultFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[60/91] Compiling Futures FutureStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[61/91] Compiling Futures HandleEventsFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/FlattenFuture.swift:17:20: error: cannot convert value of type 'Base.Output.FutureType' to closure result type 'Base.Output'
                $0.makeFuture()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[62/91] Compiling Futures MapKeyPathFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[63/91] Compiling Futures MapResultFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[64/91] Compiling Futures MatchEitherFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[65/91] Compiling Futures FlattenStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[66/91] Compiling Futures ForEachStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/FlattenStream.swift:17:20: error: cannot convert value of type 'Base.Output.StreamType' to closure result type 'Base.Output'
                $0.makeStream()
                ~~~^~~~~~~~~~~~
                                as! Base.Output
[67/103] Compiling Futures StreamAllSatisfyFuture.swift
[68/103] Compiling Futures StreamContainsFuture.swift
[69/103] Compiling Futures StreamContainsWhereFuture.swift
[70/103] Compiling Futures StreamFirstFuture.swift
[71/103] Compiling Futures StreamFirstWhereFuture.swift
[72/103] Compiling Futures StreamForwardFuture.swift
[73/105] Compiling Futures RepeatStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[74/105] Compiling Futures ReplaceEmptyStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[75/105] Compiling Futures ReplaceErrorStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[76/105] Compiling Futures ScanStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[77/105] Compiling Futures SequenceStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[78/105] Compiling Futures SetFailureTypeStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[79/105] Compiling Futures ShareStream.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Stream/SetFailureTypeStream.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[80/107] Compiling Futures SelectFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[81/107] Compiling Futures SetFailureTypeFuture.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:27: warning: will never be executed
            $0.mapError { $0 as! Failure }
                          ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Future/SetFailureTypeFuture.swift:35:25: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
            $0.mapError { $0 as! Failure }
                        ^
[82/109] Compiling Futures ReplaceErrorFuture.swift
[83/109] Compiling Futures ReplaceOutputFuture.swift
[84/109] Compiling Futures SelectAnyFuture.swift
[85/111] Compiling Futures NeverFuture.swift
[86/111] Compiling Futures PeekFuture.swift
[87/111] Compiling Futures PollOnFuture.swift
[88/114] Compiling Futures Either.swift
[89/114] Compiling Futures MatchOptionalFuture.swift
[90/114] Compiling Futures MatchResultFuture.swift
[91/114] Compiling Futures PrintFuture.swift
[92/114] Compiling Futures ReadyFuture.swift
[93/114] Compiling Futures ReferenceFuture.swift
[94/120] Compiling Futures ThenFuture.swift
[95/120] Compiling Futures TryLazyFuture.swift
[96/123] Compiling Futures StreamFuture.swift
[97/123] Compiling Futures StreamIgnoreOutputFuture.swift
[98/123] Compiling Futures StreamLastFuture.swift
[99/123] Compiling Futures StreamLastWhereFuture.swift
[100/123] Compiling Futures StreamReduceFuture.swift
[101/123] Compiling Futures StreamReduceIntoFuture.swift
[102/125] Compiling Futures StreamReplayBuffer.swift
[103/125] Compiling Futures SwitchToLatestStream.swift
[104/125] Compiling Futures TryMapStream.swift
[105/125] Compiling Futures UnfoldStream.swift
[106/125] Compiling Futures YieldStream.swift
[107/125] Compiling Futures ZipStream.swift
[108/127] Compiling Futures FlatMapInputSink.swift
[109/127] Compiling Futures MapErrorSink.swift
[110/129] Compiling Futures BlockingSink.swift
[111/129] Compiling Futures BufferSink.swift
[112/129] Compiling Futures CollectSink.swift
[113/131] Compiling Futures TryMapFuture.swift
[114/131] Compiling Futures TaskScheduler.swift
[115/131] Compiling Futures TaskRunner.swift
[116/131] Compiling Futures Result.swift
[117/131] Compiling Futures Sink.swift
[118/131] Compiling Futures RunLoopExecutor.swift
[119/131] Compiling Futures ThreadExecutor.swift
[120/131] Compiling Futures Private.swift
[121/131] Compiling Futures SinkCloseFuture.swift
[122/131] Compiling Futures SinkFlushFuture.swift
[123/131] Compiling Futures MapInputSink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[124/131] Compiling Futures SetFailureTypeSink.swift
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:25:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:24:56: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollSend(&context, item).mapError {
                                                       ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:32:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:31:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollFlush(&context).mapError {
                                                  ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:39:13: warning: will never be executed
            .failure(.failure($0 as! Failure)) // swiftlint:disable:this force_cast
            ^
/Users/builder/builds/UKfvDsi8u/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Futures/Sink/SetFailureTypeSink.swift:38:51: note: '$0' is of type 'Never' which cannot be constructed because it is an enum with no cases
        return _base.pollClose(&context).mapError {
                                                  ^
[125/131] Compiling Futures SinkSendAllFuture.swift
[126/131] Compiling Futures SinkSendFuture.swift
[127/131] Compiling Futures Promise.swift
[128/131] Compiling Futures Task.swift
[129/131] Compiling Futures ChannelImpl.swift
[130/131] Compiling Futures Context.swift
[131/131] Compiling Futures QueueExecutor.swift
error: fatalError
BUILD FAILURE 5.10 macosSpm

Build Machine: Mac 7