undefined symbol: _D3std7variant...

[baz]

On Tuesday, 22 October 2019 at 13:07:54 UTC, Andrey wrote:
> On Tuesday, 22 October 2019 at 12:57:45 UTC, Daniel Kozak wrote:
>> Have you try to clean all caches? Try to remove .dub folder
>
> I removed .dub folder but this error appears again.

Try the "-allinst" option. It's possibly a bug with speculative 
template instantiation.
"-allinst" deactivates speculation and everything is always 
instantiated and therefore present in the object files.