Using `os.walk` to traverse a filesystem on Windows does not terminate in the case of a recursive mountpoint existing somewhere in the path.

In my case C:\circlemount is linked to C:\, producing paths such as C:\circlemount\circlemount\circlemount\circlemount\...

A drive mount point may be set up as follows:

```diskpart (enters shell)
list volume`
select volume ${#}`
assign mount=${path}
```

Notably this only happens for Win32 python. Cygwin and MSYS2 pythons as well as the pythons distributed with some packages like Inkscape behave properly.