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,
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