{"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"RigidTy::FnPtr(sig)"}]}
            RigidTy::FnPtr(sig) => sig.visit(visitor),
            | RigidTy::FnDef(_, args) => args.visit(visitor),
            RigidTy::Dynamic(pred, r, _) => {