[Bug c++/103871] [11/12 Regression] co_await causes build error

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103871

--- Comment #14 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #13)
> (In reply to Jason Merrill from comment #12)
> > Should we revert the backport for 11.3?
> 
> I think that will regress other tests (but admit I did not have time to try
> it).

(and it does not actually fix the underlying problem - which is why I hadn't
pushed on that)