Why do failed contracts don't dump stack backtrace in unittests?

[Paul Backus]

On Sunday, 4 September 2022 at 14:14:55 UTC, Ali Çehreli wrote:
> The program output is different whether an Error is thrown from 
> main or from the unittest block:

Because the default test runner catches the Error, and doesn't 
print the stack trace:

https://github.com/dlang/dmd/blob/25799d3841ea87246c56532f6f91d9a1e34d8d8f/druntime/src/core/runtime.d#L599-L620

There's even a comment about it:

     // TODO: omit stack trace only if assert was thrown
     // directly by the unittest.