Added bind-function primitive that allows us to define functions, also changed evaluation to allow for a persistent environment
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		@@ -3,15 +3,15 @@ open Printf;;
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open Lisp;;
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open Eval;;
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open Read;;
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let rec repl c =
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let rec repl env c =
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  let () = printf ">>> "; Out_channel.flush Out_channel.stdout; in
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  match In_channel.input_line c with
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  | None -> ()
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  | Some l -> 
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    let vals = (parse_str l) in
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    (* dbg_print_all vals; *)
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    dbg_print_all (eval_all vals);
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    dbg_print_all (eval_all env vals);
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    Out_channel.flush Out_channel.stdout;
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    repl c;;
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    repl env c;;
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let _ = repl (In_channel.stdin)
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let _ = repl (make_env ()) (In_channel.stdin)
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