Swift Package IndexBuild Information
Failed to build Futura.swift, reference master (1dd68c), with Swift 6.3 for macOS (SPM) on 22 Apr 2026 09:50:28 UTC.
Build Command
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64Build Log
========================================
RunAll
========================================
Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/thedavidharris/Futura.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/thedavidharris/Futura
* branch master -> FETCH_HEAD
* [new branch] master -> origin/master
HEAD is now at 1dd68ce Add documentation
Cloned https://github.com/thedavidharris/Futura.git
Revision (git rev-parse @):
1dd68cee8588d15c77dff40e699ee411bc5e1e1e
SUCCESS checkout https://github.com/thedavidharris/Futura.git at master
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
"identity": ".resolve-product-dependencies",
"name": "resolve-dependencies",
"url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
"version": "unspecified",
"path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
"traits": [
"default"
],
"dependencies": [
{
"identity": "futura",
"name": "Futura.swift",
"url": "https://github.com/thedavidharris/Futura.git",
"version": "unspecified",
"path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Futura",
"traits": [
"default"
],
"dependencies": [
]
}
]
}
Fetching https://github.com/thedavidharris/Futura.git
[1/448] Fetching futura
Fetched https://github.com/thedavidharris/Futura.git from cache (0.82s)
Creating working copy for https://github.com/thedavidharris/Futura.git
Working copy of https://github.com/thedavidharris/Futura.git resolved at master (1dd68ce)
warning: '.resolve-product-dependencies': dependency 'futura' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform: macosSpm
Swift version: 6.3
Building package at path: $PWD
https://github.com/thedavidharris/Futura.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
[3/19] Compiling Futura Promise+Void.swift
[4/20] Compiling Futura FutureError.swift
[5/20] Compiling Futura Future+Do.swift
[6/20] Compiling Futura Future+Map.swift
[7/20] Compiling Futura Future+Retry.swift
/Users/admin/builder/spi-builder-workspace/Sources/Future+Retry.swift:21:23: warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
19 | /// - Returns: existing Future object
20 | @discardableResult
21 | public func retry<Value>(attempts: Int, delay delayTime: TimeInterval = 0, retryBody: @escaping () -> Future<Value>) -> Future<Value> {
| `- warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
22 |
23 | var attemptsLeft = attempts
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:45:21: note: 'Value' previously declared here
43 |
44 | /// Generic class for a Future
45 | public class Future<Value>: FutureType {
| `- note: 'Value' previously declared here
46 |
47 | /// Generic value type
[8/20] Compiling Futura Future+Time.swift
/Users/admin/builder/spi-builder-workspace/Sources/Future+Retry.swift:21:23: warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
19 | /// - Returns: existing Future object
20 | @discardableResult
21 | public func retry<Value>(attempts: Int, delay delayTime: TimeInterval = 0, retryBody: @escaping () -> Future<Value>) -> Future<Value> {
| `- warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
22 |
23 | var attemptsLeft = attempts
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:45:21: note: 'Value' previously declared here
43 |
44 | /// Generic class for a Future
45 | public class Future<Value>: FutureType {
| `- note: 'Value' previously declared here
46 |
47 | /// Generic value type
[9/20] Compiling Futura Either.swift
[10/20] Compiling Futura Future+Always.swift
[11/20] Emitting module Futura
/Users/admin/builder/spi-builder-workspace/Sources/Future+Retry.swift:21:23: warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
19 | /// - Returns: existing Future object
20 | @discardableResult
21 | public func retry<Value>(attempts: Int, delay delayTime: TimeInterval = 0, retryBody: @escaping () -> Future<Value>) -> Future<Value> {
| `- warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
22 |
23 | var attemptsLeft = attempts
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:45:21: note: 'Value' previously declared here
43 |
44 | /// Generic class for a Future
45 | public class Future<Value>: FutureType {
| `- note: 'Value' previously declared here
46 |
47 | /// Generic value type
/Users/admin/builder/spi-builder-workspace/Sources/Future+Variadic.swift:16:28: warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
14 | /// - Parameter futures: an array of futures of the same type
15 | /// - Returns: a single promise combining the resolved values of `futures`
16 | public static func all<Value>(_ futures: [Future<Value>]) -> Future<[Value]> {
| `- warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
17 | return Promise<[Value]>{ (fullfill, reject) in
18 | if futures.isEmpty {
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:45:21: note: 'Value' previously declared here
43 |
44 | /// Generic class for a Future
45 | public class Future<Value>: FutureType {
| `- note: 'Value' previously declared here
46 |
47 | /// Generic value type
/Users/admin/builder/spi-builder-workspace/Sources/Future+Variadic.swift:37:28: warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
35 | /// - Parameter futures: an array of futures of the same type
36 | /// - Returns: a single future combining the resolved values of `futures`
37 | public static func all<Value>(_ futures: Future<Value>...) -> Future<[Value]> {
| `- warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
38 | return all(futures)
39 | }
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:45:21: note: 'Value' previously declared here
43 |
44 | /// Generic class for a Future
45 | public class Future<Value>: FutureType {
| `- note: 'Value' previously declared here
46 |
47 | /// Generic value type
[12/20] Compiling Futura Future+Race.swift
[13/20] Compiling Futura Future+Recover.swift
[14/20] Compiling Futura Future+Validate.swift
/Users/admin/builder/spi-builder-workspace/Sources/Future+Variadic.swift:16:28: warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
14 | /// - Parameter futures: an array of futures of the same type
15 | /// - Returns: a single promise combining the resolved values of `futures`
16 | public static func all<Value>(_ futures: [Future<Value>]) -> Future<[Value]> {
| `- warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
17 | return Promise<[Value]>{ (fullfill, reject) in
18 | if futures.isEmpty {
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:45:21: note: 'Value' previously declared here
43 |
44 | /// Generic class for a Future
45 | public class Future<Value>: FutureType {
| `- note: 'Value' previously declared here
46 |
47 | /// Generic value type
/Users/admin/builder/spi-builder-workspace/Sources/Future+Variadic.swift:37:28: warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
35 | /// - Parameter futures: an array of futures of the same type
36 | /// - Returns: a single future combining the resolved values of `futures`
37 | public static func all<Value>(_ futures: Future<Value>...) -> Future<[Value]> {
| `- warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
38 | return all(futures)
39 | }
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:45:21: note: 'Value' previously declared here
43 |
44 | /// Generic class for a Future
45 | public class Future<Value>: FutureType {
| `- note: 'Value' previously declared here
46 |
47 | /// Generic value type
/Users/admin/builder/spi-builder-workspace/Sources/Future+Variadic.swift:23:32: error: value of type '[Future<Value>]' has no member 'containsOnly'
21 | futures.forEach({ (future) in
22 | future.then({ _ in
23 | if futures.containsOnly(where: { $0.state == .resolved }) {
| `- error: value of type '[Future<Value>]' has no member 'containsOnly'
24 | fullfill(futures.compactMap({ $0.value }))
25 | }
/Users/admin/builder/spi-builder-workspace/Sources/Future+Variadic.swift:23:67: error: cannot infer contextual base in reference to member 'resolved'
21 | futures.forEach({ (future) in
22 | future.then({ _ in
23 | if futures.containsOnly(where: { $0.state == .resolved }) {
| `- error: cannot infer contextual base in reference to member 'resolved'
24 | fullfill(futures.compactMap({ $0.value }))
25 | }
[15/20] Compiling Futura Future+Variadic.swift
/Users/admin/builder/spi-builder-workspace/Sources/Future+Variadic.swift:16:28: warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
14 | /// - Parameter futures: an array of futures of the same type
15 | /// - Returns: a single promise combining the resolved values of `futures`
16 | public static func all<Value>(_ futures: [Future<Value>]) -> Future<[Value]> {
| `- warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
17 | return Promise<[Value]>{ (fullfill, reject) in
18 | if futures.isEmpty {
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:45:21: note: 'Value' previously declared here
43 |
44 | /// Generic class for a Future
45 | public class Future<Value>: FutureType {
| `- note: 'Value' previously declared here
46 |
47 | /// Generic value type
/Users/admin/builder/spi-builder-workspace/Sources/Future+Variadic.swift:37:28: warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
35 | /// - Parameter futures: an array of futures of the same type
36 | /// - Returns: a single future combining the resolved values of `futures`
37 | public static func all<Value>(_ futures: Future<Value>...) -> Future<[Value]> {
| `- warning: generic parameter 'Value' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
38 | return all(futures)
39 | }
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:45:21: note: 'Value' previously declared here
43 |
44 | /// Generic class for a Future
45 | public class Future<Value>: FutureType {
| `- note: 'Value' previously declared here
46 |
47 | /// Generic value type
/Users/admin/builder/spi-builder-workspace/Sources/Future+Variadic.swift:23:32: error: value of type '[Future<Value>]' has no member 'containsOnly'
21 | futures.forEach({ (future) in
22 | future.then({ _ in
23 | if futures.containsOnly(where: { $0.state == .resolved }) {
| `- error: value of type '[Future<Value>]' has no member 'containsOnly'
24 | fullfill(futures.compactMap({ $0.value }))
25 | }
/Users/admin/builder/spi-builder-workspace/Sources/Future+Variadic.swift:23:67: error: cannot infer contextual base in reference to member 'resolved'
21 | futures.forEach({ (future) in
22 | future.then({ _ in
23 | if futures.containsOnly(where: { $0.state == .resolved }) {
| `- error: cannot infer contextual base in reference to member 'resolved'
24 | fullfill(futures.compactMap({ $0.value }))
25 | }
[16/20] Compiling Futura Future+Wrap.swift
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:86:29: error: cannot convert return expression of type 'Value??' to return type 'Value?'
84 | /// Convenience accessor for the associated value of the future
85 | public var value: Value? {
86 | return try? result?.get()
| |- error: cannot convert return expression of type 'Value??' to return type 'Value?'
| `- note: arguments to generic parameter 'Wrapped' ('Value?' and 'Value') are expected to be equal
87 | }
88 |
[17/20] Compiling Futura Future.swift
/Users/admin/builder/spi-builder-workspace/Sources/Future.swift:86:29: error: cannot convert return expression of type 'Value??' to return type 'Value?'
84 | /// Convenience accessor for the associated value of the future
85 | public var value: Value? {
86 | return try? result?.get()
| |- error: cannot convert return expression of type 'Value??' to return type 'Value?'
| `- note: arguments to generic parameter 'Wrapped' ('Value?' and 'Value') are expected to be equal
87 | }
88 |
[18/20] Compiling Futura Callback.swift
/Users/admin/builder/spi-builder-workspace/Sources/Collection+Future.swift:40:29: error: value of type 'Self' has no member 'containsOnly'
38 | for future in self {
39 | future.then(on: queue) { _ in
40 | if self.containsOnly(where: { $0.state == .resolved }) {
| `- error: value of type 'Self' has no member 'containsOnly'
41 | fullfill(self.compactMap { $0.value })
42 | }
/Users/admin/builder/spi-builder-workspace/Sources/Collection+Future.swift:40:64: error: cannot infer contextual base in reference to member 'resolved'
38 | for future in self {
39 | future.then(on: queue) { _ in
40 | if self.containsOnly(where: { $0.state == .resolved }) {
| `- error: cannot infer contextual base in reference to member 'resolved'
41 | fullfill(self.compactMap { $0.value })
42 | }
[19/20] Compiling Futura Collection+Future.swift
/Users/admin/builder/spi-builder-workspace/Sources/Collection+Future.swift:40:29: error: value of type 'Self' has no member 'containsOnly'
38 | for future in self {
39 | future.then(on: queue) { _ in
40 | if self.containsOnly(where: { $0.state == .resolved }) {
| `- error: value of type 'Self' has no member 'containsOnly'
41 | fullfill(self.compactMap { $0.value })
42 | }
/Users/admin/builder/spi-builder-workspace/Sources/Collection+Future.swift:40:64: error: cannot infer contextual base in reference to member 'resolved'
38 | for future in self {
39 | future.then(on: queue) { _ in
40 | if self.containsOnly(where: { $0.state == .resolved }) {
| `- error: cannot infer contextual base in reference to member 'resolved'
41 | fullfill(self.compactMap { $0.value })
42 | }
[20/20] Compiling Futura Promise.swift
BUILD FAILURE 6.3 macosSpm