Debugging silent exit of threads in Phobos calls

[ketmar]

Russel Winder wrote:

> On Fri, 2018-06-01 at 16:37 +0300, ketmar via Digitalmars-d-learn
> wrote:
>> 
> […]
>> yeah. if it receives something it doesn't expect (and there is no
>> `Variant` clause to catch it), it throws. and exceptions from threads are
>> silently dropped on the floor -- along with the dead threads. so it is 
>> better
>> to always wrap your threads in `try/catch`, and at least log an
>> exception.
>
> It seems that in the case he presence of the Variant doesn't matter.
>
> The message sent is of type frontend_manager.FrontendAppeared and one
> of the receive types is frontend_manager.FrontendAppreared yet this
> fails to match but it is not treated as a Variant. 
>
> The stack trace is:

it looks like "// type T is not constructible from A" phobos assertion 
triggered. that is, std.variant cannot wrap the struct, and all hell breaks 
loose.