anchor.diff:  rem
   rem Examples:
   rem   1. mkdir "c:\Python36\Lib\site-packages.pycache_copy"
  -rem      copy_pycache.bat "c:\Python36\Lib\site-packages" "c:\Python36\Lib\site-packages.pycache_copy"
  +rem      call copy_pycache.bat "c:\Python36\Lib\site-packages" "c:\Python36\Lib\site-packages.pycache_copy"
   rem   2. mkdir "c:\Python36\Lib\site-packages.pycache_copy"
  -rem      copy_pycache.bat -prefix_dirs "__pycache__|__pycache__/37" -suffix_names ".cpython-37" "c:\Python36\Lib\site-packages" "c:\Python36\Lib\site-packages.pycache_copy"
  +rem      call copy_pycache.bat -prefix_dirs "__pycache__|__pycache__/37" -suffix_names ".cpython-37" "c:\Python36\Lib\site-packages" "c:\Python36\Lib\site-packages.pycache_copy"
   rem   3. mkdir "c:\Python36\Lib\site-packages.pycache_copy"
  -rem      copy_pycache.bat -prefix_dirs "" -suffix_names "" "c:\Python36\Lib\site-packages" "c:\Python36\Lib\site-packages.pycache_copy"
  +rem      call copy_pycache.bat -prefix_dirs "" -suffix_names "" "c:\Python36\Lib\site-packages" "c:\Python36\Lib\site-packages.pycache_copy"
   rem
   
   setlocal
  
positive.code: 
  rem script flags
  set "FLAG_VALUE_PREFIX_DIRS=__pycache__"
  set "FLAG_VALUE_SUFFIX_NAMES=.cpython-36|.cpython-35|.cpython-34|.cpython-33|.cpython-32"
  
  :FLAGS_LOOP
  
  
negative.code: 
  if not "%FLAG%" == "" (
    if "%FLAG%" == "-prefix_dirs" (
      set "FLAG_VALUE_PREFIX_DIRS=%~2"
      shift
      shift
    ) else if "%FLAG%" == "-suffix_names" (
      set "FLAG_VALUE_SUFFIX_NAMES=%~2"
      shift
      shift
    ) else (
      echo.%?~nx0%: error: invalid flag: %FLAG%
  