https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91357
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's UB, no question. The table of "Optional sequence container operations"
says a[n] is equivalent to *(a.begin() + n) so when n==a.size() you dereference
the past-the-end iterator, which is UB.
