code: def FSkip(params, ctxt, scope, stream, coord):
      
      if len(params) != 1:
          raise errors.InvalidArguments(coord, "{} args".format(len(params)), "FSkip accepts only one argument")
  
      skip_amt = PYVAL(params[0])
      pos = skip_amt + stream.tell()
      return FSeek([pos], ctxt, scope, stream, coord)
docs: Returns 0 if successful or -1 if the address is out of range