InternalError on packages with -latest component in their version

[stephencelis]

Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?

• Confirmed reproduction steps with SwiftPM CLI.

Description

The following package fails to resolve:

// swift-tools-version: 6.0

import PackageDescription

let package = Package(
  name: "FigureOutDependencies",
  platforms: [.macOS(.v10_15)],
  dependencies: [
    .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", exact: "1.16.1"),
    .package(url: "https://github.com/apple/swift-syntax", from: "600.0.0-latest"),
  ],
  swiftLanguageVersions: [.v6]
)

But removing the swiftLanguageVersions parameter causes it to resolve just fine.

Expected behavior

I expect the package to resolve in both Swift 5 and 6 language modes.

Actual behavior

Failure to resolve:

🛑 Showing Recent Issues
InternalError(description: "Internal error. Please file a bug at https://github.com/apple/swift-package-manager/issues with this info. Expected root cause {swift-snapshot-testing[everything] 1.16.1, ¬swift-syntax[everything] 508.0.1..<601.0.0} to almost satisfy the current partial solution:\n * [Decision 0: figureoutdependencies[everything] 1.0.0]\n * [Derivation: swift-syntax[everything] 600.0.0-latest..<601.0.0 ← {figureoutdependencies[everything] 1.0.0, ¬swift-syntax[everything] 600.0.0-latest..<601.0.0}]\n * [Derivation: swift-snapshot-testing[everything] 1.16.1..<2.0.0 ← {figureoutdependencies[everything] 1.0.0, ¬swift-snapshot-testing[everything] 1.16.1..<2.0.0}]\n * [Derivation: ¬swift-snapshot-testing[everything] 1.16.2..<2.0.0 ← {swift-snapshot-testing[everything] 1.16.2..<2.0.0}]\n")

Steps to reproduce

Create a new package with the above Package.swift file, or simply download and open FigureOutDependencies.zip.

Swift Package Manager version/commit hash

Swift Package Manager - Swift 6.0.0-dev (Xcode 16 beta 1)

Swift & OS version (output of swift --version ; uname -a)

swift-driver version: 1.109.2 Apple Swift version 6.0 (swiftlang-6.0.0.3.300 clang-1600.0.20.10)
Target: arm64-apple-macosx14.0
Darwin MacBook-Pro.lan 23.5.0 Darwin Kernel Version 23.5.0: Wed May 1 20:14:38 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T6020 arm64

[abidon]

I was coming here to report the same thing. Adding another Package.swift in case it can help resolve the issue.

Description

The following package fails to resolve:

// swift-tools-version: 6.0

import PackageDescription

let package = Package(
    name: "ReproSPMBug",
    products: [
    ],
    dependencies: [
        .package(
            url: "https://github.com/abidon/Mockable.git",
            branch: "2d1a7a48665b2719f3abf812ac97f4daf23685a8"
        ),
        .package(
            url: "https://github.com/apple/swift-testing.git",
            exact: "0.10.0"
        ),
        .package(
            url: "https://github.com/pointfreeco/swift-dependencies.git",
            exact: "1.3.1"
        ),
    ]
)

Adding or removing the swiftLanguageVersions: [.v6] parameter doesn't seem to have an impact in this case.

Expected behavior

I expect the package to resolve in both Swift 5 and 6 language modes.

Actual behavior

Failure to resolve:

InternalError(description: "Internal error. Please file a bug at https://github.com/apple/swift-package-manager/issues with this info. Expected root cause {swift-dependencies[everything] 1.3.1, ¬swift-syntax[everything] 509.0.0..<601.0.0} to almost satisfy the current partial solution:\n * [Decision 0: repro-spm-bug[everything] 1.0.0]\n * [Derivation: swift-syntax[everything] 600.0.0-latest..<601.0.0 ← {repro-spm-bug[everything] 1.0.0, ¬swift-syntax[everything] 600.0.0-latest..<601.0.0}]\n * [Derivation: swift-dependencies[everything] 1.3.1 ← {repro-spm-bug[everything] 1.0.0, ¬swift-dependencies[everything] 1.3.1}]\n * [Derivation: swift-testing[everything] 0.10.0 ← {repro-spm-bug[everything] 1.0.0, ¬swift-testing[everything] 0.10.0}]\n")

Steps to reproduce

Create a new package with the above Package.swift file.

Swift Package Manager version/commit hash

Swift Package Manager - Swift 6.0.0-dev (Xcode 16 beta 1)

Swift & OS version

MacOS 15.0 Beta (24A5264n) // Xcode 16.0 Beta (16A5171c)

swift-driver version: 1.109.2 Apple Swift version 6.0 (swiftlang-6.0.0.3.300 clang-1600.0.20.10)
Target: arm64-apple-macosx15.0
Darwin Beam.local 24.0.0 Darwin Kernel Version 24.0.0: Thu May 30 21:30:12 PDT 2024; root:xnu-11215.0.31.511.2~1/RELEASE_ARM64_T6000 arm64

[xedin]

Looks like the problem here is not 6.0 but the fast that one of the depedencies is using -latest now. There is a Swift forums thread about this behavior - https://forums.swift.org/t/what-does-this-dependency-resolution-error-mean/72278/8

[kabiroberai]

Looks like this is partly intentional

https://github.com/apple/swift-tools-support-core/blob/b170d46b94d6c1cd91db97d2e3a1e0bdb5b79a24/Sources/TSCUtility/Version.swift#L347-L360

But I believe the InternalError is still considered a bug — the diagnostic here should be better. Possibly related to TSCUtility.Version.< and Range<Version>.contains (overload defined in TSCUtility) having different version ordering semantics?

[MaxDesiatov]

But removing the swiftLanguageVersions parameter causes it to resolve just fine.

I don't find this to be the case, removing swiftLanguageVersions has no effect with swift-DEVELOPMENT-SNAPSHOT-2024-06-13-a.