std::to_address doesn't work for QList::iterator

QList<int> l;
assert(std::to_address(l.begin()) == l.data());

/usr/include/c++/9/bits/ptr_traits.h: In instantiation of ‘struct std::pointer_traits<QList<int>::iterator>’:
/usr/include/c++/9/bits/ptr_traits.h:171:54:   required by substitution of ‘template<class _Ptr> constexpr decltype (std::pointer_traits<_Ptr>::to_address(__ptr)) std::__to_address(const _Ptr&) [with _Ptr = QList<int>::iterator]’
/usr/include/c++/9/bits/ptr_traits.h:207:31:   required from ‘constexpr auto std::to_address(const _Ptr&) [with _Ptr = QList<int>::iterator]’
/usr/include/c++/9/bits/ptr_traits.h:119:21: error: static assertion failed: pointer type defines element_type or is like SomePointer<T, Args>
  119 |       static_assert(!is_same<element_type, __undefined>::value,
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~