Blocking actor API seems to not work

caf-test.c

#include <caf/all.hpp>
using std::chrono::seconds;
using namespace caf;

void my_blocking_actor_fn(blocking_actor *self)
{
  self->receive(
    [](int val) -> int { return val*2; } /* never called */
  );
}


void caf_main(actor_system &system)
{
  auto actor1 = system.spawn(my_blocking_actor_fn);
  scoped_actor self{system};
  /* always times out */
  self->request(actor1, seconds(1), 99).receive(
    [&](int val) { aout(self) << "return value was " << val << std::endl; },
    [&](error &err) { aout(self) << err << std::endl; }
  );
}

CAF_MAIN()