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I'm getting rule graph errors when adding a new synthetic targets request union rule. It seems to be related to `EnvironmentNameRequest`. I noticed `SyntheticTargetsRequest` doesn't have `EnvironmentName` marked as `in_scope_types` in it's union declaration. Presumably there's something else I have to implement to get this to work?

I'm guessing I need to add a rule that resolves to an `EnvironmentName`?

Okay I think I understand actually - something in my union rules requires `EnvironmentName`, which is not in scope yet when my union is calculated.