Thanks guys :-) * Nicolas Pouillard <[email protected]> [2009-01-03 16:39:59 +0100]:
> Excerpts from Xie Hanjian's message of Sat Jan 03 16:28:30 +0100 2009:
> > Hi,
> >
> > I tried this in ghci:
> > >Prelude> 1:2:[] == 1:2:[]
> > True
> >
> > Does this mean (:) return the same object on same input, or
> > (==) is not for identity checking? If the later is true, how
> > can I check two object is the *same* object?
>
> Here (==) is the structural equality. There is generally no exposed function
> to check for identity of values. This would expose too much of the memory
> model and the compilation process to give a specification to such a function.
>
> --
> Nicolas Pouillard
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