[Bug libstdc++/95851] New: [10/11 Regression] std::to_chars(p, p, c, 2) segfault

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95851

            Bug ID: 95851
           Summary: [10/11 Regression] std::to_chars(p, p, c, 2) segfault
           Product: gcc
           Version: 10.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

The following has undefined behaviour, trying to write past the end of the
range:

#include <charconv>
int main()
{
  char c = 0;
  std::to_chars(&c, &c, c, 2);
}