anchor.diff:  set BEFORE_DEVICES=%tmp%\outlineinstaller-tap-devices-before.txt
   set AFTER_DEVICES=%tmp%\outlineinstaller-tap-devices-after.txt
   
  +echo Creating TAP network device...
   echo Storing current network device list...
   wmic nic where "netconnectionid is not null" get netconnectionid > "%BEFORE_DEVICES%"
   if %errorlevel% neq 0 (
  
positive.code: if %errorlevel% neq 0 goto :loop
  
  :configure
  echo Configuring new TAP network device...
  
  :: Give the device an IP address.
  :: 10.0.85.x is a guess which we hope will work for most users (Docker for
  
negative.code: :: Check whether the device already exists.
  netsh interface show interface name=%DEVICE_NAME% >nul
  if %errorlevel% equ 0 (
    echo TAP network device already exists.
    goto :configure
  )
  
  :: Add the device, recording the names of devices before and after to help
  