Finding the file and unittest that triggers an ICE during dub project build only when unittests are enabled

[Luis]

On Friday, 12 June 2020 at 18:18:25 UTC, Per Nordlöw wrote:
> When I build my project as
>
>     dub run --compiler=dmd --build=unittest
>
> it crashes as
>
> Performing "unittest" build using dmd for x86_64.
> phobos-next ~master: building configuration "library"...
> Segmentation fault (core dumped)
> dmd failed with exit code 139.
>
> whereas
>
>     dub run --compiler=dmd --build=debug
>
> passes.
>
> How do I most easily track down which unittest in which file 
> that causes the crash?

Fails with dub test ?