Is there any real reason to use "const"?

[rempas]

On Monday, 24 January 2022 at 19:15:42 UTC, Steven Schveighoffer 
wrote:
>
> I know exactly what you were doing:
>
> ```d
> void mul_num(T)(T num) {
>    num *= 2;
> }
> ```
>
> That will fail if you just do `mul_num(number)` because 
> templates infer the type from the argument (e.g. T becomes 
> `const int`)
>
> Unfortunately, D doesn't have a "tail-const" modifier, which 
> would work really well here.
>
> -Steve

Yeah right, now I remember! I did it about 2 months ago in a 
template function that converts types and It didn't compiled. 
Now, I know why, thank you!