Pop Quiz what is wrong with this code?

[Patrick Schluter]

On Saturday, 20 June 2020 at 23:36:25 UTC, Avrina wrote:
> On Saturday, 20 June 2020 at 18:15:27 UTC, Steven Schveighoffer 
> wrote:
>> On 6/20/20 12:00 PM, Danni Coy wrote:
>>
>>> I tried explicitly making x and y ints and I got a 
>>> depreciation warning.
>>
>> foreach(ptrdiff_t y, ref row; offsetMap)
>>
>> is that what you wanted?
>>
>> ptrdiff_t is the signed version of size_t. The complaint is 
>> not that you are converting from unsigned to signed, but that 
>> you are converting from 64-bit to 32-bit.
>>
>> -Steve
>
> Why isn't that deprecated as well? implicitly converting from 
> ulong to long is an error as much as ulong to uint.

No. conversion of ulong to uint loses 32 times more data than 
conversion to long does.