so I got this monitor count working (winapi)\:
https://play.nim-lang.org/#pasty=PyckciMy

but as soon as I try to move `monitors` and `enum_callback` into the proc
`get_monitor_count` I get `SIGSEGV: Illegal storage access. (Attempt to read
from nil?)` for the call to  EnumDisplayMonitors.

does anybody know why?