{"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"let"}]}
    let discr_size = Size::from_bits(match discr_ty.kind() {
    let discr_ty = discr.ty(body, tcx);
        ty::Uint(uint) => uint.normalize(tcx.sess.target.pointer_width).bit_width().unwrap(),