Return pointer to array of 4 integers:

  int32_t (* bar(void))[4] {
      static int32_t u[4] = {1, 0, 1, 0};
      return &u;
  }

Return a pointer to a function taking a char:

  void f(char a) {
      // ...
  }

  void (* baz(void))(char) {
      return f;
  }