err.nim

# foundit.nim
# ......

42 proc all_perms(list:seq[int]):seq[seq[int]] =
43  var ourlist = list
44  while next_perm(ourlist):
45    result.add(ourlist)
46  return result
47  
48
49 var list = @[1,2,3]
50 var res = all_perms(list)
51 echo res
     
------------     
### Traceback (most recent call last)
foundit.nim(50)          foundit
foundit.nim(45)          all_perms
SIGSEGV: Illegal storage access. (Attempt to read from nil?)