22:57:37tfebjcowan: FWIW when and unless were in lisp machine lisp by 1983, see http://www.bitsavers.org/pdf/mit/cadr/chinual_5thEd_Jan83/chinualJan83_04_FlowOfCtl.pdf
22:58:02jcowanAh, I was looking in the 4th ed. Thanks.
22:59:02tfebdunno if they originated there but suspect do