{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"debug!(\"get_argument_index_for_region:"}]}
                    debug!("get_argument_index_for_region: arg_ty = {arg_ty:?}");
                |arg_ty| {
                    tcx.any_free_region_meets(arg_ty, |r| r.as_var() == fr)