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fix eval:alts to not add context

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svn: r8383

original commit: b7a19fdc4a19e7f62a6f47f05e4ea32b6d97b98b
This commit is contained in:
Matthew Flatt 2008-01-22 14:54:37 +00:00
parent 0d52905593
commit c63cd9a943
1 changed files with 9 additions and 2 deletions
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11
collects/scribble/eval.ss
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@ -124,14 +124,21 @@
(cdr val-list+outputs)
#f)))))))
(define (extract s . ops)
(let loop ([s s][ops ops])
(cond
[(null? ops) s]
[(syntax? s) (loop (syntax-e s) ops)]
[else (loop ((car ops) s) (cdr ops))])))
(define ((do-eval ev) s)
(syntax-case s (code:comment eval:alts)
[(code:line v (code:comment . rest))
((do-eval ev) #'v)]
((do-eval ev) (extract s cdr car))]
[(code:comment . rest)
(list (list (void)) "" "")]
[(eval:alts p e)
((do-eval ev) #'e)]
((do-eval ev) (extract s cdr cdr car))]
[else
(with-handlers ([exn:fail? (lambda (e)
(list (exn-message e)