Given a generic address/target

project/hello/main:cmds

I want to get possible targets it could generate (if any, otherwise I get itself back). I can't seem to figure out how from grokking the code

I think _TargetParametrizations

Ah that didn't work originally because I was missing the rules in the rule runner which generates the targets

you could copy and paste a rulerunner from working tests and then prune from there (or not)

I know the one rule I need, it just feels dirty to use it directly