Passing iterators as arguments

[KnorrFG]

It might be strange to ask this now, after the thread derailed a little, BUT: 
Araqs solution to my question worked until now. I tried to call that template a 
2nd time2 lines later, which yields to the error: ` Error: redefinition of 
'iter'; previous declaration here: ...` I tried to return it as an anonymous 
iter like this:
    
    
    template toFirstClassIter*(it): untyped =
      return iterator(): auto {.closure.} =
        for x in it:
          yield x
    
    
    
    Run

but then I get the error `Error: no return type declared`