Age of Continuations?

[Dan Sugalski <address@hidden>]

Here's a quick question--I figure this is probably the best place to 
ask, as the web's been somewhat unhelpful.

How old are continuations as a Lips language feature? I've got 
references that indicate they're going on 30 years old or more, but 
nothing definitive, and I admit my Lisp library's somewhat lacking.
-- 
                                         Dan

--------------------------------------"it's like this"-------------------
Dan Sugalski                          even samurai
dan@sidhe.org                         have teddy bears and even
                                       teddy bears get drunk