Just found this debugger...

[JN]

On Wednesday, 3 October 2018 at 23:51:38 UTC, tide wrote:
> On Wednesday, 3 October 2018 at 13:20:03 UTC, JN wrote:
>> On Wednesday, 3 October 2018 at 03:25:04 UTC, solidstate1991 
>> wrote:
>>> Then I had a thought: Is there anything usable on the market 
>>> besides these?
>>
>> It may not be enough for your needs, but VSCode C++ debugger 
>> somewhat works for D. I can't set breakpoints, but stepping 
>> through code works and watches also work for most simple types.
>
> Enable the setting in your user/workspace:
>
>   // Allow setting breakpoints in any file.
>   "debug.allowBreakpointsEverywhere": true,

I'll give it a try.

Stuff like that should be added to Debuggers wiki I guess. Right 
now it's full of some outdated out-of-IDE debuggers that barely 
anyone uses nowadays.