Debugging with GDB?

[mszs]

I checked online and found some instructions on how the use GDB with nim. So, 
I'm using `--debugger:native` before starting `nim-gdb` and starting debugging. 
But then I'm here:
    
    
    Temporary breakpoint 1, main (argc=3, args=0x7fffffffd1f8, 
env=0x7fffffffd218)
        at 
/home/marko/.choosenim/toolchains/nim-2.0.2/lib/std/private/ospaths2.nim:217
    217      break
    (gdb) list
    212
    213  var sepPos = -1
    214  for i in countdown(len(path)-1, stop):
    215    if path[i] in {DirSep, AltSep}:
    216      sepPos = i
    217      break
    218  if sepPos >= 0:
    219    result.head = substr(path, 0,
    220      when (NimMajor, NimMinor) <= (1, 0):
    221        sepPos-1
    
    
    Run

I'm confused why I would end up at this location.