// Invariant: On return, the top of the iterator stack is the next valid (possibly
  // end) iterator, regardless of whether or not an error is reported, and regardless of
  // whether any error is reported by exception or error code. In other words, progress
  // is always made so a loop on the iterator will always eventually terminate
  // regardless of errors.
  BOOST_FILESYSTEM_DECL
  void recur_dir_itr_imp::increment(system::error_code* ec)

#define BOOST_FILESYSTEM_VERSION 3

//  As an example program, we don't want to use any deprecated features
#ifndef BOOST_FILESYSTEM_NO_DEPRECATED 
#  define BOOST_FILESYSTEM_NO_DEPRECATED
#endif
#ifndef BOOST_SYSTEM_NO_DEPRECATED 
#  define BOOST_SYSTEM_NO_DEPRECATED
#endif

#include "boost/filesystem/operations.hpp"
#include "boost/filesystem/path.hpp"
#include "boost/progress.hpp"
#include <iostream>

namespace fs = boost::filesystem;

int main(int argc, char* argv[])
{
  fs::path p(fs::current_path());

  if (argc > 1)
    p = fs::system_complete(argv[1]);
  else
    std::cout << "\nusage:   recursive_ls [path]" << std::endl;

  unsigned long file_count = 0;
  unsigned long dir_count = 0;
  unsigned long other_count = 0;
  unsigned long err_count = 0;

  if (!fs::exists(p))
  {
    std::cout << "\nNot found: " << p << std::endl;
    return 1;
  }

  if (fs::is_directory(p))
  {
    boost::system::error_code ec;
    std::cout << "\nIn directory: " << p << "\n\n";
    fs::recursive_directory_iterator end_iter;
    for (fs::recursive_directory_iterator dir_itr(p);
          dir_itr != end_iter;)
    {
      try
      {
        if (fs::is_directory(dir_itr->status()))
        {
          ++dir_count;
          std::cout << dir_itr->path() << " [directory]\n";
        }
        else if (fs::is_regular_file(dir_itr->status()))
        {
          ++file_count;
          std::cout << dir_itr->path() << "\n";
        }
        else
        {
          ++other_count;
          std::cout << dir_itr->path() << " [other]\n";
        }

        boost::system::error_code ec;
        dir_itr.increment(ec);
        if (ec)
        {
            ++err_count;
            std::cout << "*" << dir_itr->path() << " *" << ec.message() << std::endl;
        }
      }
      catch (const std::exception & ex)
      {
        ++err_count;
        std::cout << dir_itr->path() << " " << ex.what() << std::endl;
      }
    }
    std::cout << "\n" << file_count << " files\n"
              << dir_count << " directories\n"
              << other_count << " others\n"
              << err_count << " errors\n";
  }
  else // must be a file
  {
    std::cout << "\nFound: " << p << "\n";    
  }
  return 0;
}

/Users/<user>/Downloads/iTerm.app on /private/var/folders/ys/08961svn0qx6_1g9sg6j32sw0000gn/T/AppTranslocation/317B211C-C40C-4662-8947-416AC32DD07B (nullfs, local, nodev, nosuid, read-only, nobrowse, mounted by iscan)

In directory: "/var/folders/ys/08961svn0qx6_1g9sg6j32sw0000gn/T/AppTranslocation/"

"/var/folders/ys/08961svn0qx6_1g9sg6j32sw0000gn/T/AppTranslocation/317B211C-C40C-4662-8947-416AC32DD07B" [directory]
"/var/folders/ys/08961svn0qx6_1g9sg6j32sw0000gn/T/AppTranslocation/317B211C-C40C-4662-8947-416AC32DD07B/d" [directory]
"/var/folders/ys/08961svn0qx6_1g9sg6j32sw0000gn/T/AppTranslocation/317B211C-C40C-4662-8947-416AC32DD07B/d/iTerm.app" [directory]

... shortened ...

"/var/folders/ys/08961svn0qx6_1g9sg6j32sw0000gn/T/AppTranslocation/317B211C-C40C-4662-8947-416AC32DD07B/d/iTerm.app/Contents/Frameworks/ColorPicker.framework/ColorPicker"
"/var/folders/ys/08961svn0qx6_1g9sg6j32sw0000gn/T/AppTranslocation/317B211C-C40C-4662-8947-416AC32DD07B/d/iTerm.app/Contents/Info.plist"
"/var/folders/ys/08961svn0qx6_1g9sg6j32sw0000gn/T/AppTranslocation/317B211C-C40C-4662-8947-416AC32DD07B/d/iTerm.app/Contents/PkgInfo"
Assertion failed: ((m_imp.get())&&("attempt to dereference end iterator")), function dereference, file ../../../boost/filesystem/operations.hpp, line 1013.
*Abort trap: 6

sudo -s                               # Switch to root
pip3 install fusepy
python3 memoryfs.py mountpoint/ &     # The file memoryfs.py must be downloaded to the current directory
mkdir -p mountpoint/dirxx/dir2
mkdir -p mountpoint/diryy/dir2
./recursive_ls

usage:   recursive_ls [path]

In directory: "/home/rodney/Projects/boost/libs/filesystem/test"

"/home/rodney/Projects/boost/libs/filesystem/test/mountpoint" [directory]
"/home/rodney/Projects/boost/libs/filesystem/test/mountpoint/dirxx" [directory]
*"/home/rodney/Projects/boost/libs/filesystem/test/mountpoint/dirxx" *Input/output error
"/home/rodney/Projects/boost/libs/filesystem/test/mountpoint/dirxx" [directory]
recursive_ls: ../../../boost/filesystem/operations.hpp:1013: boost::filesystem::directory_entry& boost::filesystem::directory_iterator::dereference() const: Assertion `(m_imp.get())&&("attempt to dereference end iterator")' failed.
Aborted

void directory_iterator_increment(directory_iterator& it,
    system::error_code* ec)
	
	/* .... */
	
	 if (increment_ec)  // happens if filesystem is corrupt, such as on a damaged optical disc
        {
          boost::intrusive_ptr< detail::dir_itr_imp > imp;
          imp.swap(it.m_imp);
          path error_path(imp->dir_entry.path().parent_path());  // fix ticket #5900
          if (ec == 0)
            BOOST_FILESYSTEM_THROW(
              filesystem_error("boost::filesystem::directory_iterator::operator++",
                error_path,
                increment_ec));
          *ec = increment_ec;
          return;
        }

  void recur_dir_itr_imp::increment(system::error_code* ec)
  {
    /* ..... */

    //  Do the actual increment operation on the top iterator in the iterator
    //  stack, popping the stack if necessary, until either the stack is empty or a
    //  non-end iterator is reached.
    while (!m_stack.empty())
    {
      directory_iterator& it = m_stack.top();
      detail::directory_iterator_increment(it, ec);
      if (ec && *ec)     /// <<<<<----------------- here
        return;
      if (it != directory_iterator())
        break;

      m_stack.pop();
      --m_level;
    }