truffleruby-head build is failing

[anakinj]

The truffleruby build is failing for some reason. For example https://github.com/jwt/ruby-jwt/runs/1591113294

Is there something we could do? @gogainda @eregon

[eregon]

It seems to happen within SimpleCov, I'll try to investigate tomorrow.

[eregon]

It's a bug of docile, doing incorrect delegation in https://github.com/ms-ati/docile/blob/f065fc32daeaf04cef387b324a8e340119ac14d0/lib/docile/fallback_context_proxy.rb#L87

It's a bug in general, as some cases with *args, **kwargs delegation don't work in CRuby 2.7 either (https://eregon.me/blog/2019/11/10/the-delegation-challenge-of-ruby27.html#ruby-3-style-delegation).
It only triggers on TruffleRuby because it is slightly closer to 2.6 semantics when it comes to **kwargs.

As a workaround, I think you could have all the coverage logic (requires and SimpleCov calls) in spec_helper.rb under if ENV['COVERAGE'] and make sure COVERAGE is not set for TruffleRuby or adapt the condition.

I'll make a PR to docile.

[anakinj]

Thanks for the investigation (and fix). I think we'll wait it out until a compatible version is released.

Would like to move to the other direction, always have Simplecov enabled for a better local dev experience while running the tests.

[eregon]

ms-ati/docile#52 (comment) so it should work for the next build.

[anakinj]

Very nice, it seems to be working. Thanks a bunch!