[Bug c++/111242] Out of bounds pointer arithmetic for dynamic allocated arrays not caught in constexpr

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111242

--- Comment #3 from Tomasz Kamiński <tkaminsk at gcc dot gnu.org> ---
There is also similar issues, where out of bound writes are not detected, when
capacity is reserved:
```
constexpr bool bar() {
  std::vector<int> v;
  v.reserve(2);
  int* ptr = v.data();
  ptr[0] = 1; // UB, `int` not in lifetime, should be non-constant
  return true;
}
```

https://godbolt.org/z/9W5hdhraM