{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"canonical_goal_evaluation:"}]}
        canonical_goal_evaluation: &mut ProofTreeBuilder<D>,
        canonical_input: CanonicalInput<I>,
        f: impl FnOnce(&mut EvalCtxt<'_, D>, Goal<I, I::Predicate>) -> R,