Alex Yes, that is what happens. (with BSL) But if I remove the erroneous (define and...) then it again flags pair? as "function not defined". I think maybe it only prints one error msg, the last one found.
Sorry for the delay. I am rebuilding the laundry room here at my sister's house during the day and now I'm trying to read up on the evolution of program languages - I find that getting a handle on how/why people did things helps me a lot to actually understand the concepts and methods we have arrived at today. And I need all the help I can get. <g> It's 30 yrs since I touched a line of code and I was never into the theory stuff anyway. Regards Rufus On 03/04/2015 04:17 PM, Alexander D. Knauth wrote: > > On Mar 4, 2015, at 1:18 PM, Rufus <rlagg...@mail.com> wrote: > >> If I then add Alexander's example define so the def file appears as follows: >> --------- >> (define rufus 0) >> >> (define atom? (lambda (arg1) >> (and (not (pair? arg1)) >> (not (null? arg1))))) >> ------------- >> >> and hit Run I get an error in the I-pane: >> >> "pair?; this function is not defined”. > > When you include this: > (define and ‘dummy) > Do you get: > define: expected a variable name, or a function name and its variables (in > parentheses), but found a keyword > instead of the `pair?` error? > ____________________ Racket Users list: http://lists.racket-lang.org/users
