Swift Package IndexBuild Information
Failed to build StreamUI, reference main (522447), with Swift 6.1 for macOS (SPM) on 4 Oct 2026 10:09:49 UTC.
Build Command
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64Build Log
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RunAll
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Builder version: 5.1.1
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/rozd/stream-ui.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/rozd/stream-ui
* branch main -> FETCH_HEAD
* [new branch] main -> origin/main
HEAD is now at 522447a Enforce one observer per StreamValue in debug builds
Cloned https://github.com/rozd/stream-ui.git
Revision (git rev-parse @):
522447a3240c386644f61f6748da13bd190c8fe0
SUCCESS checkout https://github.com/rozd/stream-ui.git at main
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Build
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Selected platform: macosSpm
Swift version: 6.1
Building package at path: $PWD
https://github.com/rozd/stream-ui.git
https://github.com/rozd/stream-ui.git
{
"dependencies" : [
],
"manifest_display_name" : "StreamUI",
"name" : "StreamUI",
"path" : "/Users/admin/builder/spi-builder-workspace",
"platforms" : [
{
"name" : "ios",
"version" : "18.0"
},
{
"name" : "macos",
"version" : "15.0"
}
],
"products" : [
{
"name" : "StreamUI",
"targets" : [
"StreamUI"
],
"type" : {
"library" : [
"automatic"
]
}
}
],
"targets" : [
{
"c99name" : "StreamUITests",
"module_type" : "SwiftTarget",
"name" : "StreamUITests",
"path" : "Tests/StreamUITests",
"sources" : [
"DeinitFinishingSequence.swift",
"StreamBuilderTests.swift",
"StreamValueTests.swift"
],
"target_dependencies" : [
"StreamUI"
],
"type" : "test"
},
{
"c99name" : "StreamUI",
"module_type" : "SwiftTarget",
"name" : "StreamUI",
"path" : "Sources/StreamUI",
"product_memberships" : [
"StreamUI"
],
"sources" : [
"FutureValue.swift",
"StreamBuilder.swift",
"StreamValue.swift"
],
"type" : "library"
}
],
"tools_version" : "6.1"
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
[3/6] Compiling StreamUI StreamValue.swift
<unknown>:0: warning: upcoming feature 'InferSendableFromCaptures' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'GlobalActorIsolatedTypesUsability' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'DisableOutwardActorInference' is already enabled as of Swift version 6
/Users/admin/builder/spi-builder-workspace/Sources/StreamUI/StreamValue.swift:102:30: error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
100 | open class StreamValue<T: Sendable> {
101 |
102 | public typealias S = any AsyncSequence<T, any Error> & Sendable
| `- error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
103 |
104 | /// The latest snapshot of the stream: `.empty` until the first element,
/Users/admin/builder/spi-builder-workspace/Sources/StreamUI/StreamValue.swift:195:11: warning: 'catch' block is unreachable because no errors are thrown in 'do' block
193 | }
194 | // Stream ended normally: keep the last value.
195 | } catch is CancellationError {
| `- warning: 'catch' block is unreachable because no errors are thrown in 'do' block
196 | // Structured cancellation — the view went away or runID changed.
197 | } catch {
error: emit-module command failed with exit code 1 (use -v to see invocation)
[4/6] Compiling StreamUI FutureValue.swift
<unknown>:0: warning: upcoming feature 'InferSendableFromCaptures' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'GlobalActorIsolatedTypesUsability' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'DisableOutwardActorInference' is already enabled as of Swift version 6
[5/6] Emitting module StreamUI
<unknown>:0: warning: upcoming feature 'InferSendableFromCaptures' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'GlobalActorIsolatedTypesUsability' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'DisableOutwardActorInference' is already enabled as of Swift version 6
/Users/admin/builder/spi-builder-workspace/Sources/StreamUI/StreamValue.swift:102:30: error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
100 | open class StreamValue<T: Sendable> {
101 |
102 | public typealias S = any AsyncSequence<T, any Error> & Sendable
| `- error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
103 |
104 | /// The latest snapshot of the stream: `.empty` until the first element,
[6/6] Compiling StreamUI StreamBuilder.swift
<unknown>:0: warning: upcoming feature 'InferSendableFromCaptures' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'GlobalActorIsolatedTypesUsability' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'DisableOutwardActorInference' is already enabled as of Swift version 6
/Users/admin/builder/spi-builder-workspace/Sources/StreamUI/StreamValue.swift:102:30: error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
100 | open class StreamValue<T: Sendable> {
101 |
102 | public typealias S = any AsyncSequence<T, any Error> & Sendable
| `- error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
103 |
104 | /// The latest snapshot of the stream: `.empty` until the first element,
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-2F0A5646E1D333AE.txt
[2/5] Compiling StreamUI FutureValue.swift
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/5] Emitting module StreamUI
/Users/admin/builder/spi-builder-workspace/Sources/StreamUI/StreamValue.swift:102:30: error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
100 | open class StreamValue<T: Sendable> {
101 |
102 | public typealias S = any AsyncSequence<T, any Error> & Sendable
| `- error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
103 |
104 | /// The latest snapshot of the stream: `.empty` until the first element,
[4/5] Compiling StreamUI StreamBuilder.swift
/Users/admin/builder/spi-builder-workspace/Sources/StreamUI/StreamValue.swift:102:30: error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
100 | open class StreamValue<T: Sendable> {
101 |
102 | public typealias S = any AsyncSequence<T, any Error> & Sendable
| `- error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
103 |
104 | /// The latest snapshot of the stream: `.empty` until the first element,
[5/5] Compiling StreamUI StreamValue.swift
/Users/admin/builder/spi-builder-workspace/Sources/StreamUI/StreamValue.swift:102:30: error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
100 | open class StreamValue<T: Sendable> {
101 |
102 | public typealias S = any AsyncSequence<T, any Error> & Sendable
| `- error: non-protocol, non-class type 'AsyncSequence<T, any Error>' cannot be used within a protocol-constrained type
103 |
104 | /// The latest snapshot of the stream: `.empty` until the first element,
/Users/admin/builder/spi-builder-workspace/Sources/StreamUI/StreamValue.swift:195:11: warning: 'catch' block is unreachable because no errors are thrown in 'do' block
193 | }
194 | // Stream ended normally: keep the last value.
195 | } catch is CancellationError {
| `- warning: 'catch' block is unreachable because no errors are thrown in 'do' block
196 | // Structured cancellation — the view went away or runID changed.
197 | } catch {
BUILD FAILURE 6.1 macosSpm