{"ast_node_type":"variable","tokens":[{"end":97,"kind":"keyword","start":0,"text":"let"}]}
        let preserve_switch_reads = matches!(body.phase, MirPhase::Built | MirPhase::Analysis(_))
        // Preserve `SwitchInt` reads on built and analysis MIR, or if `-Zmir-preserve-ub`.
            || tcx.sess.opts.unstable_opts.mir_preserve_ub;