Detecting exception unwinding

[Ola Fosheim Grøstad via Digitalmars-d-learn]

On Wednesday, 3 February 2016 at 12:44:39 UTC, Jacob Carlborg 
wrote:
> * Worst case scenario, override "_d_throwc" [2]
>
> For the trace handler and overriding "_d_throwc" you would just 
> use the default implementation plus store a boolean (or 
> counter) in a TLS variable indicating an exception has been 
> thrown.

Yes, if there is no such feature planned then maybe creating a 
new runtime is the most sensible option.