book: improve pointer box borrowing examples #23447
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These two borrowing examples were confusing/misleading. This changes it to more clearly show how you _can_ borrow a box, and also uses & instead of &*.
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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @steveklabnik (or someone else) soon. If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. The way Github handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes. Please see CONTRIBUTING.md for more information. |
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@bors: r+ rollup |
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📌 Commit 5429f94 has been approved by |
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Thanks. |
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| ``` | ||
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| Or as long as it's not a mutable borrow. This will error: | ||
| We can mutably borrow `x` multiple times, but only if x itself is mutable, and | ||
| it may not be *simultaneously* borrowed: | ||
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| ```{rust,ignore} |
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This compiles now right? Does it still need ignore? Also, is rust still needed?
…labnik These two borrowing examples were confusing/misleading. This changes it to more clearly show how you _can_ borrow a box, and also uses & instead of &*.
These two borrowing examples were confusing/misleading. This changes it
to more clearly show how you can borrow a box, and also uses & instead
of &*.