{"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"let"}]}
            let branch_value_ty = branch_value.const_.ty();
        | (Copy(to_switch_on) | Move(to_switch_on), Constant(branch_value)) => {
            // we only want to apply this optimization if we are matching on integrals (and chars),