From: Brian Candler <b.candler@...>
Date: 2009-08-10T21:10:11+09:00
Subject: Re: Kind of ParsTree for 1.9.1

Lui Core wrote:
>> I think that's the point :-) You *have* to pass it a String source for 
>> it to parse. You can't take an object which Ruby has already parsed and 
>> installed, such as method(:foo) in this case, and get the sexp from the 
>> object.
> 
> One way to generate AST from live object is to use method_missing, which 
> is applicable in 1.9 with pure ruby code.
> 
> see
> http://rubyquiz.com/quiz95.html

That's not proper Ruby; I don't see any loops or conditional branches. I 
suspect this approach requires you to solve the halting problem. e.g.

sxp {
  for i in 3..1.0/0
    for j in 3..i
      for k in j..i
        for p in 3..i
          if i**p + j**p == k**p
            puts "fermat disproved: #{i}, #{j}, #{k}, #{p}"
            break
          end
        end
      end
    end
  end
}
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