{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
    let local_data_id = fx.module.declare_data_in_func(data_id, fx.bcx.func);
    let data_id = data_id_for_vtable(fx.tcx, &mut fx.constants_cx, fx.module, ty, trait_ref);
    if fx.clif_comments.enabled() {