Matthias helpfully pointed me at this http://www.ccs.neu.edu/home/matthias/HtDP2e/part_two.html#%28part._i2-3%29, which made me reflect a bit more and I agree now it is fair to say that `(1 2 3) is short for (list 1 2 3). Perhaps a reflexive reaction from letting myself get confused about quotation once too many times. ;)
On May 1, 2017, 2:04 PM -0400, Scott Moore <sdmo...@fas.harvard.edu>, wrote: > Hijacking this thread a little, but a pet peeve: ‘(1 2 3) is not short for > (list 1 2 3), it just happens to evaluate to that… > > (let ([x 0]) (list x x)) -> (list 0 0) > (let ([x 0]) ‘(x x)) -> (list ‘x ‘x) > > Perhaps the reader should implement #l(, which inserts an explicit `list` at > the beginning of the list. > Then there would still be a short way to write (list 1 2 3): #l(1 2 3), > without all the hiccups involved when using ‘ as an abbreviation for list... > > On May 1, 2017, 1:08 PM -0400, Ben Greenman <benjaminlgreen...@gmail.com>, > wrote: > > '(1 2 3) is short for (list 1 2 3) > > which is short for (cons 1 (cons 2 (cons 3 null)) > > which is different from (mcons 1 (mcons 2 (mcons 3 null))) > > > > I hope this helps > > > > > > > On Mon, May 1, 2017 at 1:03 PM, <circularba...@gmail.com> wrote: > > > > I posted this question on stackoverflow but have not found an answer > > > > yet. > > > > https://stackoverflow.com/questions/43476080/self-evaluting-racket-interpreter > > > > > > > > I've been trying to write a Racket interpreter that can interpret > > > > itself. > > > > > > > > interpreter.rkt contains the code for the interpreter. It is pretty > > > > standard. Then, in interpreter-self-evaluate.rkt, I > > > > 1. import interpreter.rkt, > > > > 2. copy paste the code from interpreter.rkt and > > > > 3. evaluate the code using the eeval function defined in > > > > interpreter.rkt. > > > > > > > > However, this returns an error "; mcdr: contract violation". I suspect > > > > that the problem is in interpreter-self-evaluate.rkt and that it might > > > > have something to do with how quote works. I might be completely off > > > > base though. Any ideas? > > > > > > > > -- > > > > You received this message because you are subscribed to the Google > > > > Groups "Racket Users" group. > > > > To unsubscribe from this group and stop receiving emails from it, send > > > > an email to racket-users+unsubscr...@googlegroups.com. > > > > For more options, visit https://groups.google.com/d/optout. > > > > -- > > You received this message because you are subscribed to the Google Groups > > "Racket Users" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to racket-users+unsubscr...@googlegroups.com. > > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
