{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(_))"}]}
                ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(_)) => GoalSource::Misc,
                // FIXME(-Znext-solver=coinductive): should these WF goals also be unproductive?
                p => unreachable!("unexpected nested goal in `relate`: {p:?}"),