{"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
                    let Some(dc_mpi) = downcast else {
                        move_path_children_matching(move_data, mpi, |x| x.is_downcast_to(vid));
                        return variant_needs_drop(tcx, typing_env, args, variant);