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Updated the documentation

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Michael Bryan 2019-07-21 02:40:58 +08:00
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book-example/src/for_developers/backends.md
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@ -261,6 +261,10 @@ in [`RenderContext`].
> **Note:** There is no guarantee that the destination directory exists or is > **Note:** There is no guarantee that the destination directory exists or is
> empty (`mdbook` may leave the previous contents to let backends do caching), > empty (`mdbook` may leave the previous contents to let backends do caching),
> so it's always a good idea to create it with `fs::create_dir_all()`. > so it's always a good idea to create it with `fs::create_dir_all()`.
>
> If the destination directory already exists, don't assume it will be empty.
> To allow backends to cache the results from previous runs, `mdbook` may leave
> old content in the directory.
There's always the possibility that an error will occur while processing a book There's always the possibility that an error will occur while processing a book
(just look at all the `unwrap()`'s we've written already), so `mdbook` will (just look at all the `unwrap()`'s we've written already), so `mdbook` will