{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"Cow::Borrowed(ecx.machine.union_data_ranges.entry(ty).or_insert_with(compute_range))"}]}
            Cow::Borrowed(ecx.machine.union_data_ranges.entry(ty).or_insert_with(compute_range))
        if ecx.tcx.sess.opts.unstable_opts.extra_const_ub_checks {
        } else {