[Haskell-cafe] Wikipedia on first-class object
cristi at ot.onrc.ro
Fri Dec 28 01:49:14 EST 2007
On Thu, 27 Dec 2007 18:19:47 +0200, Wolfgang Jeltsch
<g9ks157k at acme.softbase.org> wrote:
> Am Donnerstag, 27. Dezember 2007 16:34 schrieb Cristian Baboi:
>> I'll have to trust you, because I cannot test it.
>> let x=(1:x); y=(1:y) in x==y .
>> I also cannot test this:
>> let x=(1:x); y=1:1:y in x==y
> In these examples, x and y denote the same value but the result of x ==
> y is
> _|_ (undefined) in both cases. So (==) is not really equality in
> Haskell but
> a kind of weak equality: If x doesn’t equal y, x == y is False, but if x
> equals y, x == y might be True or undefined.
I can only notice that y always has an even number of 1, which is not the
case for x :-)
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