{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"if"}]}
        if ecx.tcx.sess.opts.unstable_opts.extra_const_ub_checks {
    ) -> Cow<'e, RangeSet> {
            Cow::Borrowed(ecx.machine.union_data_ranges.entry(ty).or_insert_with(compute_range))