Reference predicate is failing linter checks

[TomHennen]

This is showing up in other PRs. Example.

Ideally the linter would tell us this before merging PRs that introduce these issues, but I guess it's not (or we just missed it).

@mdeicas do you think you'd be able to fix these linter errors?

[mdeicas]

This was actually fixed in 044ba49. I also suspect that it did not run in #375 because, by default, workflows on PRs from first time contributors (which I was) require approval -- see
https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/enabling-features-for-your-repository/managing-github-actions-settings-for-a-repository#controlling-changes-from-forks-to-workflows-in-public-repositories.

[TomHennen]

Ah, that makes sense about why it wasn't run (though it seems like ideally the maintainers would have been prompted to run it).

Oh, I see, and even though the fix was 'commited' a while ago, the PR with that fix wasn't submitted until last week. Great.

I suppose we can close this then (unless there's any further tweaking to do with getting the linter to run).