https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97828

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |ppalka at gcc dot 
gnu.org
   Last reconfirmed|                            |2020-11-16
   Target Milestone|---                         |10.3

--- Comment #6 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Confirmed, your analysis makes sense to me.

For the implementation bug, I guess it would be better to mirror how
std::search_n updates __remainder and do

   __remainder = __count + 1 - (__first - __backtrack);

right after the while loop.

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