LispForum

Hello all,

I'm trying to find a way in order to detect the difference between these 2 forms: I've tried to use the consp macro or the listp macro in order to be able to highlight these 2 differents forms. Unfortunatelly, the result is always the same T
I think I missed something.

Well, it depends on how you are doing things, in general.

They aren't EQUAL, because the first creates 2 cons cells, and the second only 1 (it will print as a dotted list).

Hmm, you seem to misunderstand, CONSP and LISTP a) aren't macros b) only differ over the handling of NIL (CONSP returns false for NIL, LISTP returns true)

This is because LISTP doesn't check for proper lists, but only whether its argument is a CONS or NIL

If you want to do something special for dotted pairs, then test