alien pointer types and nil

Bug #727661 reported by Nikodemus Siivola on 2011-03-02
This bug affects 1 person
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Bug Description

This is wrong:

  (typep nil '(alien (* t))) => nil

especially given that the type translators accept NIL just fine -- translating it to NULL.

Secondly, it would be very convenient to be able to define an alien pointer type that excludes NIL / NULL. See bug 721087 for the special case of C-STRINGs.

tags: added: alien
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