I try to apply the os.walkDir() method within a closure and got the feeling
that I might have misunderstood something. In particular, running
1 import os
2
3 proc walk(obj: string): iterator(): string =
4 result = iterator(): string {.closure.} =
5 for k,p in walkDir(obj):
6 yield p
7
8 var g = walk(".")
9 while not finished(g):
10 echo "---> ", g()
crashes with the error message
...
Hint: operation successful (21553 lines compiled; 1.025 sec total;
34.004MiB; Debug Build) [SuccessX]
Hint: /home/jordan/Desktop/Devel/deadpan/src/crash . [Exec]
---> ./nim.sh
Traceback (most recent call last)
crash.nim(10) crash
crash.nim(6) :anonymous
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
Error: execution of an external program failed:
'/home/jordan/Desktop/Devel/deadpan/src/crash '
I went through a session with the GDB but have not much experience with NIM,
yet. It seems that it crashes in the GC. I tried to compile with different GCs
(including none) without luck so it might crash for another reason?
Interestingly, replacing the while loop 8..10 above with
8 for w in walk(".")():
9 echo "---> ", w
10
prints an infinite series of the same file (repeatedly restarting
walk(".")()?), in my case
---> ./nim.sh
---> ./nim.sh
...
while
8 var g = walk(".")
9 for w in g():
10 echo "---> ", w
crashes similar to the original while loop.
Has somebody come across successfully encapsulating walkDir() into a closure?
