community build: add scala-parallel-collections

[SethTisue]

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[dottybot]

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[SethTisue]

this is failing for two reasons:

first, sbt.librarymanagement.ResolveException: Error downloading org.scalacheck:scalacheck_3.0.0-M2:1.15.0 — no idea what I'm expected to do here? I already included dependencies = List(scalacheck)

second, the scala-parallel-collections build requires sbt 1.4.1+ (to get the new built-in-support for src/main/scala-2 and src/main/scala-3 directories), but it appears to me that the community build forces the version to 1.3.8. is there a way to get a newer sbt version?

[griggt]

Error downloading org.scalacheck:scalacheck_3.0.0-M2:1.15.0

This is because the current version of scalacheck in the community build is 1.14.1-SNAPSHOT.

I'm the wrong person to be giving advice here, but will note that the other projects in the community build live in forks at https://github.com/dotty-staging/ and may contain adaptations to allow/keep them building inside the community build.

On a positive note, I was able to get this to work in a locally built community build by tweaking the scalacheck version and unmanagedSourceDependencies in build.sbt.

[smarter]

first, sbt.librarymanagement.ResolveException: Error downloading org.scalacheck:scalacheck_3.0.0-M2:1.15.0 — no idea what I'm expected to do here?

As mentioned by @griggt, we'll need to update the scalacheck submodule to 1.15, because we try to keep all our community-build projects on https://github.com/dotty-staging, this means creating or (non-destructively) updating a branch on https://github.com/dotty-staging/scalacheck/ (same thing for scala-parallel-collections itself: we should fork it to dotty-staging and add that fork as our submodule) I've given you access to dotty-staging if you're up for doing that, otherwise we'll take care of it.

second, the scala-parallel-collections build requires sbt 1.4.1+ (to get the new built-in-support for src/main/scala-2 and src/main/scala-3 directories), but it appears to me that the community build forces the version to 1.3.8. is there a way to get a newer sbt version?

You can change the forced version to 1.4.1 (I would avoid 1.4.2 due to sbt/sbt#6055) and see if everything works, I think that might require updating some other projects in the community build. Or you can add an extra commit in the fork of scala-parallel-collections in dotty-staging to make it not require sbt 1.4

[SethTisue]

thanks for the advice (and the powers) — I'll return to this before too much longer. marking as draft for now.

[smarter]

PR to upgrade scalacheck: #10194