iterator in anonymous proc yields empty result

[michael72]

I found a strange bug/behavior when working with an anoymous proc that contains an iterator (the proc was generated by macros).
The iterator does not yield a result.

Example code:

proc chkConversion(x: seq[int]): seq[string] =
  result = (proc (): seq[string] =
    iterator autoIter(): auto =
      for it0 in x:
        let it1 = $it0
        yield it1

    result = @[]
    for it in autoIter():
      result.add(it))()

proc chkConversion2(x: seq[int]): seq[string] =
  result = @[]
  iterator autoIter(): auto =
    for it0 in x:
      let it1 = $it0
      yield it1
  
  for it in autoIter():
    result.add(it)

when isMainModule:
  echo("calling not working iterator:")
  echo(chkConversion(@[1,2,3,4,5]))
  echo("calling working iterator:")
  echo(chkConversion2(@[1,2,3,4,5]))

The resulting output is

calling not working iterator:
@[]
calling working iterator:
@["1", "2", "3", "4", "5"]