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 <[email protected] <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 < >> [email protected] <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 <[email protected] <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 <[email protected]> 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 [email protected]. >>> > > 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 [email protected] <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 [email protected] <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 [email protected]. For more options, visit https://groups.google.com/d/optout.
