Re: [Haskell-cafe] Re: Wikipedia on first-class object

30 Dec 2007


      Am Sonntag, 30. Dezember 2007 19:31 schrieb Cristian Baboi:
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On Sun, 30 Dec 2007 20:24:23 +0200, Daniel Fischer
 wrote:
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Am Sonntag, 30. Dezember 2007 19:04 schrieb Cristian Baboi:
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On Sun, 30 Dec 2007 20:00:05 +0200, Daniel Fischer
 wrote:
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Am Sonntag, 30. Dezember 2007 18:16 schrieb Cristian Baboi:
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A simple question:
Can you write the value of x to a file where x = (1:x) ?
Not in finite time and space :)
I used the word 'value' by mistake.
A notation of the value of x.
I suppose
let x = 1:x in x
is not what you're after?
Yes! Can Haskell do the same ?
I mean this:
module Module where
a= let x=1:x in x
main = 
The function must work if one change a to let x=2:x in x, let x=1:2:3:x
and variations on the same theme.
Can Java, C?
What do you mean by 'notation'? 
Would 
main = do
	txt <- readFile "Module.hs"
	let definitions = parseModule txt
	case lookup "a" definitions of
	  Nothing -> putStrLn "No definition for a"
	  Just rhs -> writeFile "Notation.hs" (prettyprint rhs)
satisfy you?