help with prime pairs code

[user1234]

On Sunday, 2 February 2025 at 01:12:59 UTC, user1234 wrote:
> On Saturday, 1 February 2025 at 21:56:23 UTC, Jabari Zakiya 
> wrote:
>> On Saturday, 1 February 2025 at 00:21:22 UTC, user1234 wrote:
>>> On Friday, 31 January 2025 at 20:05:54 UTC, Jabari Zakiya 
>>> wrote:
>>>> [...]
>>>
>>> A first draft of the translation, not very idiomatic D code:
>>>
>>> ```d
>>> module prime_pairs;
>>> import std;
>>>
>>> [...]
>>
>> Thank you very much!
>>
>> As you can see, D is not my primary language, but I respect 
>> its speed and readability.
>> I also have a faster Crystal version, almost identical (96%) 
>> to the Rudy code.
>
> yeah Crystal is in my scope. Whyle I'm usualy not into dynamic 
> typed langs, there's something I like in the Crystal lang.

[Gradual 
typing](https://en.wikipedia.org/wiki/Gradual_typing#:~:text=Gradual%20typing%20allows%20software%20developers,static%20typing%20to%20be%20used.)

That's the shit I like with Crystal.