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Example for with-handlers

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This commit is contained in:
Asumu Takikawa 2013-01-17 14:33:07 -05:00
parent 850069ec83
commit 15a73e2c00
1 changed files with 12 additions and 1 deletions
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13
collects/scribblings/reference/exns.scrbl
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@ -472,7 +472,18 @@ break). Beware, also, of catching and discarding exceptions, because
discarding an error message can make debugging unnecessarily discarding an error message can make debugging unnecessarily
difficult; instead of discarding an error message, consider logging it difficult; instead of discarding an error message, consider logging it
via @racket[log-error] or a logging form created by via @racket[log-error] or a logging form created by
@racket[define-logger].} @racket[define-logger].
@examples[
(with-handlers ([exn:fail:syntax?
(λ (e) (displayln "got a syntax error"))])
(raise-syntax-error #f "a syntax error"))
(with-handlers ([exn:fail:syntax?
(λ (e) (displayln "got a syntax error"))]
[exn:fail?
(λ (e) (displayln "fallback clause"))])
(raise-syntax-error #f "a syntax error"))
]}
@defform[(with-handlers* ([pred-expr handler-expr] ...) @defform[(with-handlers* ([pred-expr handler-expr] ...)
body ...+)]{ body ...+)]{