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Add guide documentation on printing exception information.

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Suggested by badkins.
This commit is contained in:
Sam Tobin-Hochstadt 2019-08-14 11:07:31 -04:00
parent 76a7ee0ccd
commit 81bdbb19e9
1 changed files with 14 additions and 0 deletions
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14
pkgs/racket-doc/scribblings/guide/control.scrbl
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@ -117,6 +117,20 @@ predicate:
(error "user break")) (error "user break"))
] ]
Exceptions carry information about the error that occurred. The
@racket[exn-message] accessor provides a descriptive message for the
exception. The @racket[exn-continuation-marks] accessor provides
information about the point where the exception was raised.
@margin-note{The @racket[continuation-mark-set->context] procedure provides best-effort structured backtrace information.}
@interaction[
(with-handlers ([exn:fail?
(lambda (v)
((error-display-handler) (exn-message v) v))])
(car 17))
]
@; ---------------------------------------- @; ----------------------------------------
@section[#:tag "prompt"]{Prompts and Aborts} @section[#:tag "prompt"]{Prompts and Aborts}