Incorrect type of a function returning a reference to an array

For the following code
```c++
int arr[5][3];

decltype(auto) f(int i)
{
    return arr[i];
}
```
Insight produces (array declaration is skipped)
```c++
int (&)[3] f(int i)
{
  return arr[i];
}
```
whilst it shall be
```c++
int (&f(int i))[3]
{
  return arr[i];
}
```