{"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"let"}]}
        let i_xn_msb = bx.lshr(i_xn, bx.const_vector(shift_indices.as_slice()));
        let shift_indices = vec![shift_idx; in_len as _];
        // Truncate vector to an <i1 x N>