Strange error raises when building SwiftPM

Development Package Manager
,
1

This error raised when I was trying to build SwiftPM locally on my Windows machine:

...
D:\workspace\repos\github.com\apple\swift-package-manager\Sources\PackageGraph\Resolution\PubGrub\PubGrubDependencyResolver.swift:615:22: error: referencing operator function '+=' on 'RangeReplaceableCollection' requires that 'OrderedSet<Term>' conform to 'RangeReplaceableCollection'
            newTerms += priorCause.terms.filter { $0.node != _mostRecentSatisfier.term.node }
                     ^
Swift.RangeReplaceableCollection:1:11: note: where 'Self' = 'OrderedSet<Term>'
extension RangeReplaceableCollection {
          ^
D:\workspace\repos\github.com\apple\swift-package-manager\Sources\PackageGraph\Resolution\PubGrub\PubGrubDependencyResolver.swift:615:22: error: referencing operator function '+=' on 'RangeReplaceableCollection' requires that 'OrderedSet<Term>' conform to 'RangeReplaceableCollection'
            newTerms += priorCause.terms.filter { $0.node != _mostRecentSatisfier.term.node }
                     ^
Swift.RangeReplaceableCollection:1:11: note: where 'Self' = 'OrderedSet<Term>'
extension RangeReplaceableCollection {
          ^
error: fatalError

I was using the latest Swift 5.10 RELEASE on Windows, building SwiftPM main branch (b49a22787). I couldn't find any posts/pages talking about such situation and it is so strange to have this error.

2

Are you using the PowerShell script to build the entire trunk toolchain or just building the trunk SwiftPM package alone with a 5.10 toolchain using swift build? I have never built Swift on Windows and do not recognize that error, but trunk SwiftPM is only ever built on the CI with a trunk Swift compiler, so it is possible it is using newer features not in Swift 5.10.

3

I was building trunk SwiftPM using swift build with the 5.10 toolchain. I was working with one downstream repo so the PowerShell script is a bit overhead to me.

trunk SwiftPM is only ever built on the CI with a trunk Swift compiler, so it is possible it is using newer features not in Swift 5.10.

Thanks for the hint, I was able to build it by switching to a more recent nightly build toolchain. I assumed that it should be able to do it with the latest release which is not actually feasible. There must be newer features in the codebase.