[Bug libstdc++/115497] [15 Regression] __is_pointer doesn't compile with clang since 014879ea4c86b3b8ab6b61a1226ee5b31e816c8b

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115497

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Changing libstdc++ order of includes won't help abseil. If their use of
__is_pointer still comes after any standard header has included
cpp_type_traits.h, the identifier will be "poisoned" by the class template. So
they need their own workaround.