D, Unit_Threaded, and GtkD

[Luis]

On Sunday, 17 May 2020 at 10:19:38 UTC, Russel Winder wrote:
> I am experimenting with using manual control of the Glib event 
> loop using the pending and iteration methods on the default 
> MainContext within each unit- threaded test. The alternative of 
> running a GTK application and then putting the tests in as an 
> asynchronous sequence only works with Rust and Python since D 
> has no coroutines of any sort.
>

A Fiber can't be used for this ? D Fibers don't have a scheduler. 
Yielding returns to the caller context.
https://dlang.org/phobos/core_thread_fiber.html