Adding initial test for gruntz

[anutosh491]

This add the following cases (https://github.com/sympy/sympy/blob/ee224c37956f6ff60f7d4328f5f9ae3a193505ca/sympy/series/gruntz.py#L255)

[anutosh491]

The c backend (c_sym) shows a segmentation fault due to reasons I'm not sure of. Might need to look into it

[certik]

I think that this looks good.

[anutosh491]

Okay I think this is why the C (c_sym) backend might not be working and we get a Segmentation fault. The C code generated is something like

void mmrv(struct list_CPtr _lpython_return_variable);
void test_mrv1();
void __main__global_stmts();



// Implementations
void mmrv(struct list_CPtr _lpython_return_variable)
{
    struct list_CPtr l;
    struct list_CPtr constname0;
    list_init_CPtr(&constname0, 0);
    constname0.current_end_point = 0;
    list_deepcopy_CPtr(&constname0, &l);

    list_deepcopy_CPtr(&l, &_lpython_return_variable);

}

void test_mrv1()
{
    struct list_CPtr __libasr__created__var__0__func_call_res;
    struct list_CPtr ans;
    mmrv(__libasr__created__var__0__func_call_res);
    list_deepcopy_CPtr(&__libasr__created__var__0__func_call_res, &ans);

    printf("");
    print_list_CPtr_(ans);
    printf("\n");
    ASSERT(ans.current_end_point == 0);
}

What we need is this I suppose

void mmrv(struct list_CPtr* _lpython_return_variable);
void test_mrv1();
void __main__global_stmts();



// Implementations
void mmrv(struct list_CPtr* _lpython_return_variable)
{
    struct list_CPtr l;
    struct list_CPtr constname0;
    list_init_CPtr(&constname0, 0);
    constname0.current_end_point = 0;
    list_deepcopy_CPtr(&constname0, &l);

    list_deepcopy_CPtr(&l, _lpython_return_variable);
    //_lpython_return_variable

}

void test_mrv1()
{
    struct list_CPtr __libasr__created__var__0__func_call_res;
    struct list_CPtr ans;
    mmrv(&__libasr__created__var__0__func_call_res);
    list_deepcopy_CPtr(&__libasr__created__var__0__func_call_res, &ans);

    printf("");
    print_list_CPtr_(ans);
    printf("\n");
    ASSERT(ans.current_end_point == 0);
}

[certik]

Yes, I think this approach is good.