[Bug c++/56389] Return types differs in block scope function declarations and function implementation

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56389

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> Fixed for GCC 11.  I cannot figure out which patch fixed it though. 
> There has been a bunch of fixes dealing with return types dealing with C++20
> concepts.

For an example PR 96443.