Hi! sorry if this is a very dumb question - but is it possible to insert a Subsystem into a rule? I am creating rules from

PackageFieldSet -> BuiltPackage

, but would like to include some config options? However that rule is called from python code directly, and it seems like there's no way to inject the Subsystem into the field set? I guess the other way would be for some code that could... create an instance of the subsystem or something from inside the rule?

Not at all dumb! It is possible, see https://www.pantsbuild.org/docs/rules-api-subsystems#using-options-in-rules

OH! huh something else I was doing must have caused the rule graph errors then! weird thanks so much! (I just tried off a different branch and... it worked fine! neat