https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118390
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
There is still
pr118390.ii: In function ‘int main()’:
pr118390.ii:13604:67: error: too many initializers for ‘char [4]’
13604 | static constexpr auto std_to_char_array = std::to_array<char>({
| ~~~~~~~~~~~~~~~~~~~^~
13605 | #embed __FILE__
| ~~~~~~~~~~~~~~~
13606 | , '\0'
| ~~~~~~
13607 | });
| ~~
error with all the 3 patches, the first one in PR118124 makes the second error
go away.