Anyone know why

TargetRootsToFieldSets

needs to be exclusively in a

@goal_rule

rather than just a regular

@rule

?

target_roots_to_field_sets_get = [Get(
        TargetRootsToFieldSets,
        TargetRootsToFieldSetsRequest(
            field_set_superclass=fs,
            goal_description="",
            no_applicable_targets_behavior=NoApplicableTargetsBehavior.ignore,
        ),
    ) for fs in peekable_field_sets]

    target_roots_to_field_sets = await MultiGet(target_roots_to_field_sets_get)

Are you referring to the

goal_description

part? It can be used anywhere. Only the

goal_description

is to make a better error message

No, if I try to run this from an

@rule

function, it bombs out with a ruleerror - but works fine when I run it in an

@goal_rule

https://github.com/pantsbuild/pants/pull/20331/files/a01c4f349bcdae1e4e00625f2d8a84750b634a79#r1435506639