lys_xpath_atomize works unexpectedly

Hi, it seems lys_xpath_atomize can not work in latest devel branch, below is my test code:

c
int main(void)
{
    struct ly_ctx *ly_ctx = ly_ctx_new(NULL, 0);

    const struct lys_module *module = lys_parse_path(ly_ctx, "a.yang", LYS_IN_YANG);
    printf("load a %s\n", module ? "success" : "failure");
    const struct lys_module *module2 = lys_parse_path(ly_ctx, "b.yang", LYS_IN_YANG);
    printf("load b %s\n", module2 ? "success" : "failure");

    struct ly_set *set = lys_xpath_atomize(module->data, LYXP_NODE_ELEM,
            "/a:A/A1/b:B[k1=1]/C[k2=1]", 0);
    assert(set);
    assert(set->number);
    printf("count: %d, last: %s\n", set->number, set->set.s[set->number - 1]->name);
    ly_set_free(set);

    ly_ctx_destroy(ly_ctx, NULL);
    return 0;
}

the output is

load a success
load b success
exe: /root/svn/nfoam/libyang/src/xpath.c:6847: eval_predicate: Assertion `exp->tokens[*exp_idx] == LYXP_TOKEN_BRACK2' failed.
Aborted

a.yang.txt b.yang.txt

该提问来源于开源项目：CESNET/libyang