{"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"parent_host_pred:"}]}
        parent_host_pred: ty::Binder<'tcx, ty::HostEffectPredicate<'tcx>>,
        mut self,
        variant: impl FnOnce(DerivedHostCause<'tcx>) -> ObligationCauseCode<'tcx>,