Method stack

include/libfork/core/impl/stack.hpp:208–208

* @brief Constructs a stack with a small empty stack. */

   * @brief Constructs a stack with a small empty stack.
   */
  stack() : m_fib(stacklet::next_stacklet()) { LF_LOG("Constructing a stack"); }

  /**
   * @brief Construct a new stack object taking ownership of the stack that `frag` is a top-of.