At Wed, 26 Sep 2018 15:57:12 -0700, Jordan Johnson wrote: > > (require racket/sandbox) > > (make-evaluator "beginner-lang.rkt") > . . ../../../../../../../../Applications/Racket > v7.0/collects/racket/private/kw-file.rkt:102:2: open-input-file: `read' > access > denied for /Users/jteach/Library/Racket/7.0/pkgs/.LOCKpkgs.rktd
That was a problem with creating a sandbox in DrRacket, as opposed to `racket` at the command line or with the handin server. It's fixed for the next release. > In doing a trial run of submitting my test solutions, I found my checker.rkt > signaling errors from the check: form: Using :language '(special > htdp-beginner), I get an error from the student’s (require 2htdp/image) line, > saying that image? is being imported twice. Long story short, this appears to be a bug in the sandbox evaluator setup, too, also fixed for the next release. A workaround is to use `'lang/htdp-beginner` as the language instead of `'(special beginner)`. That happens to avoid a redundant and troublemaking `require`. Roughly, the problem was that with `'(special beginner)` or `'(lib "lang/htdp-beginner.rkt")` the sandbox constructs a module that uses the language --- but also `require`s the language. That redundancy is a problem if there are bindings that other `require`s are intended to shadow, such as `image?` shadowed by requiring `2htdp/image`. -- 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.
