why compiler try use my sqrt not std.math?

[Cym13]

On Wednesday, 8 May 2019 at 08:48:40 UTC, Cym13 wrote:
> On Wednesday, 8 May 2019 at 08:28:57 UTC, KnightMare wrote:
>> [...]
>
> First of all, such questions are better suited for the Learn 
> section if you want quality answers.
>
> [...]

I hadn't noticed the type issue, my answer is off.