"Help me understand how to install arc. When I try to install in racket it says:

racket: undefined; cannot reference an identifier before its definition >"

Here's how I used it for my own issues:

    initializing arc.. (may take a minute)
    serving from C:\Users\user\anarki\apps\news
    starting app news
    load items:
    ranking stories.
    ready to serve port 8080

    To quit:
      arc> (quit)
      (or press ctrl and 'd' at once)
    For help on say 'string':
      arc> (help string)
    For a list of differences with arc 3.2:
      arc> (incompatibilities)
    To run all automatic tests:
      $ ./arc.sh
      arc> (load "tests.arc")

    If you have questions or get stuck, come to http://arclanguage.org/forum.
    Arc 3.2 documentation: https://arclanguage.github.io/ref.
    arc>

Simple problem: I have a file containing a program written in Arc. I want to run it from the shell. How do I do that? I can fire up arc and `(load)` the file, but then the file needs to be in the arc2.3 dir or else I have to load it by absolute path, even if I was just in the same directory it's in.

However, nothing happens at localhost8080 and when I run (nsv) it gives this message:

  The syntax of the command is incorrect.

  The syntax of the command is incorrect.
  
  The syntax of the command is incorrect.
  
  The syntax of the command is incorrect.

  'rm' is not recognized as an internal or external command,
  operable program or batch file.

  load items: Error: "directory-list: could not open 
  directory\n  path: C:\\Users\\Hopet Ma'at 
  Amun\\Desktop\\arc3.2\\arc\\news\\story\\\n  system error: 
  The system cannot find the path specified.; win_err=3"

  arc> load "news.arc"
 
  #<procedure: load>

  arc> "news.arc"
  
  arc> nsv

  #<procedure:zz>

  > racket -f as.scm

  ; racket: undefined;

  ;  cannot reference an identifier before its definition

  ;   in module: top-level

  ; [,bt for context]

  > ; -f: undefined;

  ;  cannot reference an identifier before its definition

  ;   in module: top-level

  ; [,bt for context]

  > ; as.scm: undefined;

  ;  cannot reference an identifier before its definition

  ;   in module: top-level

  ; [,bt for context]

  (mac npage (title . body)
    `(tag html
       (tag head
         (gen-css-url)
         (prn "<link rel=\"shortcut icon\" href=\"" favicon-url* "\">")
         (prn "<meta name=\"viewport\" content=\"width=device-width\">")
         (prn "<base target=\"_blank\">")
         (tag script (pr votejs*))
         (tag title (pr ,title)))
       (tag body
         (center
           (tag (table border 0 cellpadding 0 cellspacing 0 width "85%"
                       bgcolor sand)
             ,@body)
           (prn "Copyright blah blah")))))

   (define (f)
     (define v 10)
     ...)

   (defun f ()
     (let ((v 10)) 
       ...))

   (defun f ()
     (= v 10)
     ...)

    '(foo bar)

    (foo bar)

So in a similar way

    {foo "bar"}

  arc> (= user '{name "John Doe" age 23 id 73881})
  {(age . 23) (id . 73881) (name . "John Doe")}

  arc> (= user '#{name "John Doe" age 23 id 73881})
  #{(age . 23) (id . 73881) (name . "John Doe")}

  arc> #{foo "bar"}

Interestingly the "%else" would actually be cataphoric, as you refer to what comes next rather than before. So "co-referential macros" would be more fitting if you want to stick with the linguistics analogy. But that'd be too exotic of a term.

And yes as akkartik notes, it causes multiple evaluations right now, mostly just laziness and indecision on my part. I'll probably be giving control over this. Here's a real example of code where you actually want current behavior:

  (aif (ns-resolve *ns* 'specs)
    (let [c (compile spec :name name)]
      (swap! (var-get %test) update (:property c) set/union #{c}))
    (do (intern *ns* 'specs (atom {}))
         %then))