https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111831
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
CC| |ppalka at gcc dot gnu.org
--- Comment #4 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Looks like this is a dup of PR109751, which has been fixed for GCC 13.3 / 14.
A workaround for earlier GCC is to turn the problematic constrained hidden
friend into a template:
template <int = 0>
friend auto operator==(list const& l, list const& r)
...
This prevents GCC from overeagerly checking the function's constraints.
*** This bug has been marked as a duplicate of bug 109751 ***
