Swift Package IndexBuild Information
Failed to build LightweightObservable, reference 2.2.2 (f7aeda), with Swift 6.3 for macOS (SPM) on 13 Apr 2026 09:14:41 UTC.
Build Command
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64Build Log
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RunAll
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Builder version: 4.70.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/fxm90/LightweightObservable.git
Reference: 2.2.2
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/fxm90/LightweightObservable
* tag 2.2.2 -> FETCH_HEAD
HEAD is now at f7aeda3 🔖 :: Bump version
Cloned https://github.com/fxm90/LightweightObservable.git
Revision (git rev-parse @):
f7aeda3ab67922bd3ad252c5a311c58ee3e37bf5
SUCCESS checkout https://github.com/fxm90/LightweightObservable.git at 2.2.2
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ResolveProductDependencies
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Resolving dependencies ...
{
"identity": ".resolve-product-dependencies",
"name": "resolve-dependencies",
"url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
"version": "unspecified",
"path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
"traits": [
"default"
],
"dependencies": [
{
"identity": "lightweightobservable",
"name": "LightweightObservable",
"url": "https://github.com/fxm90/LightweightObservable.git",
"version": "unspecified",
"path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/LightweightObservable",
"traits": [
"default"
],
"dependencies": [
]
}
]
}
Fetching https://github.com/fxm90/LightweightObservable.git
[1/1967] Fetching lightweightobservable
Fetched https://github.com/fxm90/LightweightObservable.git from cache (6.60s)
Creating working copy for https://github.com/fxm90/LightweightObservable.git
Working copy of https://github.com/fxm90/LightweightObservable.git resolved at 2.2.2 (f7aeda3)
warning: '.resolve-product-dependencies': dependency 'lightweightobservable' is not used by any target
Found 0 product dependencies
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Build
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Selected platform: macosSpm
Swift version: 6.3
Building package at path: $PWD
https://github.com/fxm90/LightweightObservable.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version--6988338F2F200930.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/8] Compiling LightweightObservable Disposable.swift
[4/8] Compiling LightweightObservable Observable+KeyPath.swift
[5/8] Compiling LightweightObservable Observable+Equatable.swift
[6/8] Compiling LightweightObservable Observable.swift
[7/8] Emitting module LightweightObservable
/Users/admin/builder/spi-builder-workspace/LightweightObservable/Sources/Extensions/Observable+Combine.swift:24:28: error: 'Subscriber' is only available in macOS 10.15 or newer
13 |
14 | @available(iOS 13.0, *)
15 | extension Observable: Publisher {
| `- note: add '@available' attribute to enclosing extension
16 |
17 | // MARK: - Types
:
22 | // MARK: - Public methods
23 |
24 | public func receive<S: Subscriber>(subscriber: S) where S.Input == Output, S.Failure == Failure {
| | `- error: 'Subscriber' is only available in macOS 10.15 or newer
| `- note: add '@available' attribute to enclosing instance method
25 | let subscription = Subscription<S>()
26 | subscription.subscriber = subscriber
/Users/admin/builder/spi-builder-workspace/LightweightObservable/Sources/Extensions/Observable+Combine.swift:39:33: error: 'Subscriber' is only available in macOS 10.15 or newer
37 | private extension Observable {
38 | /// A custom subscription to forward events from an `Observable` instance.
39 | final class Subscription<S: Subscriber> where S.Input == Output, S.Failure == Failure {
| | `- error: 'Subscriber' is only available in macOS 10.15 or newer
| |- note: add '@available' attribute to enclosing generic class
| `- note: add '@available' attribute to enclosing generic class
40 |
41 | // MARK: - Public properties
/Users/admin/builder/spi-builder-workspace/LightweightObservable/Sources/Extensions/Observable+Combine.swift:67:21: error: 'Subscribers' is only available in macOS 10.15 or newer
64 |
65 | @available(iOS 13.0, *)
66 | extension Observable.Subscription: Subscription {
| `- note: add '@available' attribute to enclosing extension
67 | func request(_: Subscribers.Demand) {
| | `- error: 'Subscribers' is only available in macOS 10.15 or newer
| `- note: add '@available' attribute to enclosing instance method
68 | // This subscription doesn't respond to demand, since it'll only emit events
69 | // according to its underlying `Observable` instance.
[8/8] Compiling LightweightObservable Observable+Combine.swift
/Users/admin/builder/spi-builder-workspace/LightweightObservable/Sources/Extensions/Observable+Combine.swift:24:28: error: 'Subscriber' is only available in macOS 10.15 or newer
13 |
14 | @available(iOS 13.0, *)
15 | extension Observable: Publisher {
| `- note: add '@available' attribute to enclosing extension
16 |
17 | // MARK: - Types
:
22 | // MARK: - Public methods
23 |
24 | public func receive<S: Subscriber>(subscriber: S) where S.Input == Output, S.Failure == Failure {
| | `- error: 'Subscriber' is only available in macOS 10.15 or newer
| `- note: add '@available' attribute to enclosing instance method
25 | let subscription = Subscription<S>()
26 | subscription.subscriber = subscriber
/Users/admin/builder/spi-builder-workspace/LightweightObservable/Sources/Extensions/Observable+Combine.swift:39:33: error: 'Subscriber' is only available in macOS 10.15 or newer
37 | private extension Observable {
38 | /// A custom subscription to forward events from an `Observable` instance.
39 | final class Subscription<S: Subscriber> where S.Input == Output, S.Failure == Failure {
| | `- error: 'Subscriber' is only available in macOS 10.15 or newer
| |- note: add '@available' attribute to enclosing generic class
| `- note: add '@available' attribute to enclosing generic class
40 |
41 | // MARK: - Public properties
/Users/admin/builder/spi-builder-workspace/LightweightObservable/Sources/Extensions/Observable+Combine.swift:67:21: error: 'Subscribers' is only available in macOS 10.15 or newer
64 |
65 | @available(iOS 13.0, *)
66 | extension Observable.Subscription: Subscription {
| `- note: add '@available' attribute to enclosing extension
67 | func request(_: Subscribers.Demand) {
| | `- error: 'Subscribers' is only available in macOS 10.15 or newer
| `- note: add '@available' attribute to enclosing instance method
68 | // This subscription doesn't respond to demand, since it'll only emit events
69 | // according to its underlying `Observable` instance.
BUILD FAILURE 6.3 macosSpm