[Bug libstdc++/126716] under _GLIBCXX_DEBUG, std::erase_if on unordered container with transparent comparator fails to compile in C++23

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126716

Nathan Myers <ncm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
                 CC|                            |ncm at gcc dot gnu.org
   Last reconfirmed|                            |2026-09-04
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Nathan Myers <ncm at gcc dot gnu.org> ---
The call to unordered_set::erase(iterator) in __erase_nodes_if matches 
the heterogeneous-key member erase(_Kt&&) because iterator somehow 
satisfies the concept __heterogeneous_hash_key<unordered_set>, and 
(further) somehow that member is preferred over the exactly-matching 
erase(iterator).