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svn: r3712
This commit is contained in:
John Clements 2006-07-15 15:50:01 +00:00
parent 1c302a2902
commit e5511ae1ed
1 changed files with 6 additions and 4 deletions
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10
collects/stepper/private/reconstruct.ss
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@ -196,8 +196,8 @@
(length (cdr (syntax->list (syntax terms)))))
(or (and (render-settings-constructor-style-printing? render-settings)
(if (render-settings-abbreviate-cons-as-list? render-settings)
(eq? fun-val (find-special-value 'list '(3)))
(and (eq? fun-val (find-special-value 'cons '(3 empty)))
(eq? fun-val special-list-value)
(and (eq? fun-val special-cons-value)
(second-arg-is-list? mark-list))))
;(model-settings:special-function? 'vector fun-val)
(and (eq? fun-val void)
@ -209,14 +209,16 @@
;; like 'list' should not be shown as steps, because the before and after steps will be the same.
;; it might be easier simply to discover and discard these at display time.
(define (find-special-value name valid-args)
#f
#;(let* ([expanded-application (expand (cons name valid-args))]
(let* ([expanded-application (expand (cons name valid-args))]
[stepper-safe-expanded (skipto/auto expanded-application 'discard (lambda (x) x))]
[just-the-fn (kernel:kernel-syntax-case stepper-safe-expanded #f
[(#%app fn . rest)
#`fn]
[else (error 'find-special-name "couldn't find expanded name for ~a" name)])])
(eval just-the-fn)))
(define special-list-value (find-special-value 'list '(3)))
(define special-cons-value (find-special-value 'cons '(3 empty)))
(define (second-arg-is-list? mark-list)
(let ([arg-val (lookup-binding mark-list (get-arg-var 2))])