[Bug c++/124311] [16 Regression] [modules] Defaulted-in-class special member re-emitted across modules causes "cannot be overloaded with itself" since r16-3353

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124311

Nathaniel Shead <nshead at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Target Milestone|16.0                        |15.3
                 CC|                            |nshead at gcc dot gnu.org
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2026-03-02
           Assignee|unassigned at gcc dot gnu.org      |nshead at gcc dot 
gnu.org

--- Comment #4 from Nathaniel Shead <nshead at gcc dot gnu.org> ---
Confirmed.  The set_instantiating_module is correct, we still want to provide
the definition of this (inline) definition if it wasn't provided yet.  Rather I
think the problem is that we enter the 'is_new' branches in module streaming at
all; it looks like in 'key_mergeable' we should be checking for
DECL_DEFAULTED_FN rather than just DECL_ARTIFICIAL I think.