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bring htdp/*sl languages up-to-date with #true, #false, '()

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This commit is contained in:
Matthias Felleisen 2014-10-19 17:24:33 -04:00
parent bbd9c432b6
commit dede06f2a0
1 changed files with 6 additions and 4 deletions
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10
pkgs/htdp-pkgs/htdp-lib/htdp/bsl/runtime.rkt
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@ -11,7 +11,8 @@
(define (configure options)
;; Set print-convert options:
(booleans-as-true/false #t)
(booleans-as-true/false #f)
(print-boolean-long-form #t)
(constructor-style-printing #t)
(add-make-prefix-to-constructor #f)
(abbreviate-cons-as-list (memq 'abbreviate-cons-as-list options))
@ -19,9 +20,10 @@
(let ([ph (current-print-convert-hook)])
(lambda (val basic sub)
(cond
[(equal? val set!-result) '(void)]
[(is-image? val) val]
[else (ph val basic sub)]))))
[(equal? val '()) ''()]
[(equal? val set!-result) '(void)]
[(is-image? val) val]
[else (ph val basic sub)]))))
(use-named/undefined-handler
(lambda (x)
(and (memq 'use-function-output-syntax options)