https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122674

            Bug ID: 122674
           Summary: Consider making std::basic_stacktrace memory safe
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

If we always stored one default-initialized object of type
std::stacktrace_entry as a (static?) member of std::basic_stacktrace then we
could return an iterator/reference to that object for out-of-bounds calls to
operator[]

We could also make the basic_stacktrace::iterator store a pointer back to its
parent basic_stacktrace and check the bounds, so that incrementing past the end
(or before begin) would be a no-op.

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