etl: can't create etl::vector of etl::delegate

Hi, is it somehow possible to create a vector of functions like in the following example?

#include <iostream>
#include <etl/vector.h>
#include <etl/delegate.h>

int func(int a) {
    return a * 2;
}

int main() {

    etl::vector<etl::delegate<int(int)>, 5> fvec;

    fvec.push_back(etl::delegate<int(int)>::create<func>());

    std::cout << fvec.front()(21) << std::endl;

}

Trying this I get some weird error messages:

.../include/etl/vector.h:975:19: error: no matching function for call to ‘destroy(etl::delegate<int(int)>*&, etl::delegate<int(int)>*&)’
  975 |       etl::destroy(p_buffer, p_end);
      |       ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~

and

/include/etl/memory.h:1035:27: error: incomplete type ‘etl::is_trivially_destructible<etl::delegate<int(int)>, false>’ used in nested name specifier
 1035 |   typename etl::enable_if<!etl::is_trivially_destructible<typename etl::iterator_traits<TIterator>::value_type>::value, void>::type
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~