[Bug c++/97438] [accepts-invalid] coroutines accepts prmomise type with both return_value() and return_void()

[avi--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97438

--- Comment #2 from Avi Kivity <a...@cloudius-systems.com> ---
Created attachment 49379
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49379&action=edit
test case