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Original file line number Diff line number Diff line change @@ -1431,7 +1431,8 @@ For a more in-depth explanation of borrowed pointers, read the
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## Freezing
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Lending an immutable pointer to an object freezes it and prevents mutation.
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- `Owned` objects have freezing enforced statically at compile-time.
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+ `Freeze` objects have freezing enforced statically at compile-time. Examples
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+ of non-`Freeze` types are `@mut` and [`RefCell<T>`][refcell].
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~~~~
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let mut x = 5;
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// the box is now unfrozen again
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~~~~
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+ [refcell]: http://static.rust-lang.org/doc/master/std/cell/struct.RefCell.html
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# Dereferencing pointers
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Rust uses the unary star operator (`*`) to access the contents of a
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