Fable 4 hangs on CI

[wallymathieu]

Trying out Fable for various versions 4.23 to 4.27 it seems that Fable hangs on GitHub Actions.

Image: ubuntu-24.04
Version: 20251112.124.1

Also tested with ubuntu-22.04

version=`cat ./.config/dotnet-tools.json | jq --raw-output '.tools.fable.version'`
dotnet tool install --global Fable --version $version
cd tests
fable . --outDir bin --runScript ./bin

It runs fine locally. See for instance: fsprojects/FSharpPlus#649

However for another repository it seems to work fine:

https://github.com/mausch/Fuchu/actions/runs/19408182760/job/55525899866

[wallymathieu]

For some weird reason it works on a windows runner ..., so that is a workaround

[MangelMaxime]

Because of the CI output

Project and references (0 source files) parsed in 8103ms

It seems to be a duplicate of #4252

I think even if you didn't ask to install .NET the image include it by default now. And because, you have "rollForward": "latestFeature", in the global.json then Fable is running against .NET 10.

You can probably confirm it by running dotnet --version in the CI to see which version of .NET is picked up

[wallymathieu]

I’m a bit confused why it works locally though? I have .net 10 as well.

[MangelMaxime]

Looking at the fix from Buildalyzer it seems to impact Linux and not Windows so perhaps you are on windows locally.

I am going to close this issue to keep track of the work to be done.

[wallymathieu]

I use Mac locally. I tried on Ubuntu dev container.