DMD64 2.095.1 unresolved _D4core8internal7switch___T14__switch_error in optimized build only

[x3g6h7k8]

On Friday, 9 April 2021 at 14:59:16 UTC, x3g6h7k8 wrote:
> Thereafter I removed the __"inline"__ from the regular dub 
> release buildOptions. With this change an executable was 
> created.

Seems I missed that I also removed the `-release` switch, which 
was the important one. It works with or w/o `inline`.
Instead of removing `-release` it's also possible to add 
`-check=switch=off`.
Using `optimize` w/o `-release` has given me some headache with 
active out-contracts in the Base64 module (Base64.encode(bytes)) 
leading to 0xc0000005 after a seemingly corrupted stack. 
Unfortunately I can't really reproduce this in a small example. 
Maybe this was simply the place where another problem manifested 
itself.