Hi, when I removed the line #reader(lib "htdp-beginner-abbr-reader.ss" "lang")((modname snake-full) (read-case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor repeating-decimal #f #t none #f ())))
And changed the language to pretty big. I recived this error: Welcome to DrRacket, version 7.1 [3m]. Language: Pretty Big; memory limit: 128 MB. . . check-expect: undefined; cannot reference an identifier before its definition Any idea ? Thanks, Or On Wednesday, January 23, 2019 at 10:49:01 PM UTC+2, Kieron Hardy wrote: > > It seems the metadata lines added by DrRacket (mentioned by John) are > processed when the a source file is loaded into DrRacket (via the menu > option File/Open), but are not processed if the source code is directly > copied (e.g. from a browser window) into a DrRacket window and then > executed with the 'Run' button. > > The metadata includes a #reader directive, e.g.: > (#reader(lib "htdp-beginner-abbr-reader.ss" "lang")((modname snake-full) > ...) > > This reader directive appears to be silently ignored by DrRacket when the > source is 'Run', even though DrRacket shows "#reader" in red (as when an > error is detected). The actions taken by DrRacket when 'Run' is pressed > seem to depend on the settings in effect when the code is executed, which > could be nothing, or throwing a confusing error. > > The solution for the original poster's issue is as John directs; remove > the metadata (i.e. #reader directive) and manually set the language. > > However, I feel that DrRacket should recognize and act on (and perhaps > also remove/hide from view) the metadata if the metadata occurs as from a > copy/paste directly into a DrRacket window (e.g. as from a URL). The > current behaviour is, I think, a bug and a trap (perhaps showstopping) for > a new user experimenting with Racket. > > Note that the Racket executable seems to process the metadata properly, > understanding the language to use, etc.. so that the code behaves as > intended. > > On Wed, Jan 23, 2019 at 12:32 PM K H <kieron...@gmail.com <javascript:>> > wrote: > >> Hello Or, >> >> The language is not "Pretty Big". >> >> You should be using "Beginning Student with List Abbreviations". >> >> The DrRacket metadata lines referred to by John set the correct language. >> In your case you must have changed the language somehow. Or perhaps the >> file needs to be saved before the metadata is acted upon. >> >> HTH, >> >> Kieron. >> >> >> On Wed, Jan 23, 2019 at 12:17 PM 'John Clements' via Racket Users < >> racket...@googlegroups.com <javascript:>> wrote: >> >>> Interesting problem; your screenshot shows header text that should not >>> appear in the window, which suggests to me that you copied and pasted the >>> text from somewhere else into a buffer where the language level was already >>> set. It looks to me like you should do the following: >>> >>> 1) Delete the first three lines of the file. >>> 2) Set the language level to “beginner with list abbreviations”. >>> 3) Click “run” >>> >>> John Clements >>> >>> > On Jan 23, 2019, at 10:44 AM, orenpa11 <ore...@gmail.com <javascript:>> >>> wrote: >>> > >>> > Hi David, >>> > Thanks for your swift response ,I simply do not know how to run this >>> program. >>> > I thought that when I press the run button I should see the snake GUI . >>> > >>> > Maybe the language is not pretty big ? >>> > Thanks, >>> > Or >>> > >>> > >>> > On Wednesday, January 23, 2019 at 8:25:32 PM UTC+2, David K. Storrs >>> wrote: >>> > What happens when you run it? Are you getting any error messages? >>> > >>> > On Wed, Jan 23, 2019 at 1:01 PM orenpa11 <ore...@gmail.com> wrote: >>> > > >>> > > Hi >>> > > I am trying to implemet this code of "snake game " >>> > > https://course.ccs.neu.edu/csu211/code/snake-full.ss >>> > > >>> > > in DrRacket (Pretty big) >>> > > But when I run it it is not working . >>> > > any Idea ? >>> > > >>> > > Thanks >>> > > Or >>> > > >>> > > -- >>> > > 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...@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...@googlegroups.com <javascript:>. >>> > 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...@googlegroups.com <javascript:>. >>> 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.
