{"ast_node_type":"variable","tokens":[{"end":57,"kind":"keyword","start":0,"text":"let"}]}
        let shift_indices = vec![shift_idx; in_len as _];
        let shift_idx = bx.cx.const_int(bx.type_ix(in_elem_bitwidth), (in_elem_bitwidth - 1) as _);
        let i_xn_msb = bx.lshr(i_xn, bx.const_vector(shift_indices.as_slice()));