clisp: avoid using NIL for null pointers.
- Work around FFI:C-POINTER in %MEM-REF, %FOREIGN-FUNCALL and %DEFCALLBACK. - Don't accept NIL in POINTERP, FOREIGN-POINTER or INC-POINTER. - New tests: CALLBACKS.NIL-FOR-NULL, FUNCALL.POINTER-NOT-NIL, POINTER.NULL and FOREIGN-POINTER-TYPE.NIL.
parent
8704427a
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