Unexpectedly nice case of auto return type

[Basile B.]

On Wednesday, 4 December 2019 at 12:54:34 UTC, Basile B. wrote:
> On Wednesday, 4 December 2019 at 03:17:27 UTC, Adam D. Ruppe 
> wrote:
>> On Wednesday, 4 December 2019 at 01:28:00 UTC, H. S. Teoh 
>> wrote:
>>> typeof(return) is one of the lesser known cool things about D 
>>> that make it so cool.  Somebody should write an article about 
>>> it to raise awareness of it. :-D
>>
>> you know i probably will write about that next week. so be 
>> sure to like, comment, and subscribe so you never miss my next 
>> post and then give me all your money on patreon so i can keep 
>> bringing you content :P :P
>
> I've just made the refact using typeof(null) and gained 78 SLOC
> The pattern was:
>
>     void issueError();
>
> and then in the code, in a dozen a function returning different 
> classes types
>
>    if (...) {
>         issueError();
>         return null;
>    }
>
> now this becomes:
>
>    typeof(null) issueError();
>
>    if (...)
>         return issueError();
>
> I wish I knew that trick before. I prefer typeof(null) in case 
> I would translate to another language. I tend to type the 
> static type when I know it anyway.

more -520 lines today.