On Sun, 27 Oct 2002, Alessandro Baretta wrote:

> I typed does not raise the same exception. This seems to 
> imply that comparisons are allowed between functional 
> values, too.

If I remember well, = is implemented by doing first a == (equality of
pointers) test, and returning true if that test succeeds; otherwise,
the more complex recursive equality test is performed, which fails with
an exception if it encounters functional values.

So if x and y are the same closure, x=y succeeds and yields the true
value. Otherwise, it throws an exception.


David Monniaux            http://www.di.ens.fr/~monniaux
Laboratoire d'informatique de l'École Normale Supérieure,
Paris, France

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