Concat and walkDir don't work together.

[treeform]

Concat works for other iterators like in your tests, but does not work with walkDir, I don't understand why:

import os, iterutils

# works
for n in concat(toIter(1..4), toIter(20..23)):
  echo n

# does not work
for f in concat(walkDir("."), walkDir(".")):
  echo f

I don't understand the error either:

C:\p\try\iterwalkdir.nim(6, 31) Error: attempting to call routine: 'walkDir'
  found 'os.walkDir(dir: string, relative: bool, checkDir: bool) [declared in C:\Users\me\.choosenim\toolchains\nim-1.4.6\lib\pure\os.nim(2076, 10)]' of kind 'iterator

Maybe you can help?

[def-]

Looks like walkDir changed its definition and you also need to pass the parameters relative & checkDir. Maybe like this:

for f in concat(walkDir(".", true, false), walkDir(".", true, false)):
  echo f