[Bug c++/95519] [coroutines] non-functions for promise_type::return_void not supported

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95519

--- Comment #5 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #4)
> (In reply to Michael Bruck from comment #3)
> > Some of the abort messages in main were not updated after copy/paste
> > "Failed to call one of the ... cases"
> 
> I made individual test-cases for each promise entry, I'm not sure what's not
> working?

ah .. OK I see :)
I'll fix that up (but the test cases do not rely on those messages to function,
the abort() is what matters).