FYI I added a new debugging guide for Rule Graph issues, feedback welcomed. It includes a new script to help isolate where issues come from: https://www.pantsbuild.org/docs/rules-api-tips#debugging-rule-graph-issues

Thanks for the debugging script, @hundreds-father-404 That's certainly helpful for folks like me who try to understand the root cause of their problem

You're welcome! It was super useful to me debugging yesterday. In particular, getting each backend on its own to work made things a lot easier to reason about. It meant that I knew the issue was from the interaction of backends, rather than a particular backend itself.

Let's put out a tweet alerting people to this helpful new guide. Suggestions on wording?

I don't think we want to publicize the rule graph debugging guide - it's meant to make a really confusing experience less confusing. But it's still confusing at the end of the day. And we are planning to fix it through much better rule graph errors