[Ecls-list] [Suggestion] Caching expansion of type-specifier

[Tobias C. Rittweiler]

Juan Jose Garcia-Ripoll
<juanjose.garciaripoll at googlemail.com> writes:

> How can ECL decide to cache a DEFTYPE form? I mean, the following is
> utterly absurd, but it may well happen:
>
> (deftype foo () (declare (special *foo-expansion*)) *foo-expansion*)

To my knowledge, CLHS does simply not say anything about when or how
often derived types are actually expanded. So the resulting behaviour of
the above snippet is not well-specified.

  -T.