I have a function computing fft2 containing this code:

```
void DoSomeThing(Tensor *x)
{
c10::optional<IntArrayRef> n_opt = c10::nullopt;
c10::optional<IntArrayRef> norm= c10::nullopt;
IntArrayRef dim_arr = {-2, 1};
Tensor z = torch::fft::fft2(*x, n_opt, dim_arr, norm);
}
```

it will fail in release mode but not in debug mode. The issue seem to be that fft2 find huge values for dim_arr. E.g. values like 10032412311. (Note that if I print the content of dim_arr I got -2 and -1.) If I change it to

```
void DoSomeThing(Tensor *x)
{
c10::optional<IntArrayRef> n_opt = c10::nullopt;
c10::optional<IntArrayRef> norm= c10::nullopt;
int64_t arr[2] = {-2,-1};
IntArrayRef dim_arr = IntArrayRef(arr, 2) ;
Tensor z = torch::fft::fft2(*x, n_opt, dim_arr, norm);
}
```

it works fine. Note that this also works fine:

```
void DoSomeThing(Tensor *x)
{
c10::optional<IntArrayRef> n_opt = c10::nullopt;
c10::optional<IntArrayRef> norm= c10::nullopt;
Tensor z = torch::fft::fft2(*x, n_opt, {-2,-1}, norm);
}
```

I probably missed some essential c++ here. That one cannot initialize a IntArrayRef using a list other than in a function argument list.

Someone who can explain what is happening?