https://www2.ccs.neu.edu/racket/pubs/icfp99-ffkf.pdf <https://www.google.com/url?q=https%3A%2F%2Fwww2.ccs.neu.edu%2Fracket%2Fpubs%2Ficfp99-ffkf.pdf&sa=D&sntz=1&usg=AFQjCNH0DXyCOOzzMl0yr17ChMJZJ2EQ3Q> I have read this paper. I encountered a problem when I tried to run the code at the end.
[image: Image.png] After reading this article , I added at the beginning #lang racket (require (lib "unitsig.ss")) ;;<- that's what i added (define SchemeEsq (unit/sig () ;; no exports (import mredˆ) ;; The repl editor class (define esq-text% Then the problem becomes unit/sig: signature not defined in: mredˆ Does anyone know what should I do？I don't know how to solve it. The f1 page doesn't work, -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/4074fbf3-0b4f-4a65-a260-5e0c8f48a7b4o%40googlegroups.com.