[Bug c++/114795] internal compiler error: in finish_member_declaration after module import in gcc 14.0.1 snapshot

["porten at kde dot org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114795

--- Comment #4 from porten at kde dot org ---
Thanks for the reminder about the workaround. I had once seen it before trying
module but did not see the relation when running into problems later.  In the
small test case, reordering the import and includes helps! It is just that the
original code base exposes another problem. In fact, the original one I
experienced:

/opt/gcc-14/include/c++/14.0.1/format: In member function ‘auto
std::__format::_Sink_iter<_CharT>::_M_reserve(std::size_t) const [with _CharT =
char]’:
/opt/gcc-14/include/c++/14.0.1/format:2632:7: error: invalid conversion in
return statement
 2632 |       _M_reserve(size_t __n) const
      |       ^~~~~~~~~~
<<< Unknown tree: template_type_parm >>>

struct _Reservation

return D.267932;
/opt/gcc-14/include/c++/14.0.1/format:2632:7: internal compiler error:
‘verify_gimple’ failed
0x138b51e verify_gimple_in_seq(gimple*, bool)
        /home/porten/git/gcc/gcc/tree-cfg.cc:5318
[...]


If of any interest, I can try to reduce a test case preserving the error.