Just found this debugger...

[solidstate1991]

On Wednesday, 3 October 2018 at 13:08:50 UTC, Vladimir Panteleev 
wrote:
> On Wednesday, 3 October 2018 at 03:25:04 UTC, solidstate1991 
> wrote:
>> and I don't want to go back to VisualD after VSCode for either 
>> a usable mago or VS native debug.
>
> Visual Studio makes a decent stand-alone source-level debugger. 
> Just select the .exe file, and right-click it in the 
> project/solution pane to start a debugging session. (Of course, 
> you need to build with -m32mscoff or -m64 as well as -g). 
> VisualD isn't even needed, though VS by itself won't understand 
> D types like arrays/strings.

I cannot find that option...