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== Problems with functionize in general ==

The functionize-based utilities are discontinuous about the way they detect underscores: The body can use _ three times, or two times, or one time, but as soon as it uses _ zero times, it means something completely different. Thanks to this, I can break several layers of code by making a single local edit. But will I? Yes:

The 'treemem function detects occurrences of _ without regard for quoting or local scopes. So if I use an _ to activate one functionize-based utility, then I'll accidentally activate all the other functionize-based utilities which surround that one. If I want to avoid refactoring several layers of code each time I edit, I pretty much have two options:

- I can avoid putting an _ anywhere in my code, in which case this functionize feature won't be very useful to me.

- I can make sure to activate each and every functionize utility as soon as I use it, in which case they would have been better off as 'let variants. For instance, I might settle on the idiom (zap (do '_ ...) foo), but it would be more convenient to say (zaplet orig foo ...).

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== Problems in Arc ==

Your Anarki commit is one of those things that is "guaranteed to break all your code." Personally, I like using the pattern (zap [map [...] _] args), which now breaks since the _ activates zap's automatic function wrapper. It seems you would want me to write (zap (map [...] _) args) instead, but for compatibility with Rainbow, Jarc, etc., I think I'll define a macro (itfn ...) and write (zap (itfn:map (itfn:...) it) args). Effectively, I'll be recreating the [...] functionality in the way I like.

Meanwhile, Arc already covers a lot of the functionality of Clojure's -> and ->> operators using (aand ...). If you still miss -> or ->>, I recommend just implementing an 'aand variant that doesn't short-circuit on nil. Call it 'ado or something.

Here's how to use 'aand/'ado with the examples from that thread you linked to (http://arclanguage.org/item?id=18044):

  (-> (range) [map [* _ _] _] [filter even? _] [take 10 _] [reduce + _])
  (-> 5 [+ _ 3] [/ 2 _] [- 1 _])
  
  (ado (range) (map [* _ _] it) (filter even? it) (take 10 it) (reduce + it))
  (aand 5 (+ it 3) (/ 2 it) (- 1 it))

== Considerations in Wart ==

Clojure's -> and ->> operators are not infix, and that might be good for their indentation. I'm not really sure.

  (-> (...)
    (...)
    (...
      ...)
    (...))
  
  (...) ->
    (...) ->
    (...
      ...) ->
    (...)
  
  (...)
    -> (...)
    -> (...
         ...)
    -> (...)

  (...)
    -> (...)
    ->> (...
          ...)
    -> (...)