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box.md: clarify that box provides needed indirection (#2283)

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The last to-do for #64.
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Frances Wingerter 2024-08-13 14:29:11 +00:00 committed by GitHub
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src/smart-pointers/box.md
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@ -31,7 +31,8 @@ fn main() {
[call methods
from `T` directly on a `Box<T>`](https://doc.rust-lang.org/std/ops/trait.Deref.html#more-on-deref-coercion).
Recursive data types or data types with dynamic sizes need to use a `Box`:
Recursive data types or data types with dynamic sizes cannot be stored inline
without a pointer indirection, which can be worked around using `Box`:
```rust,editable
#[derive(Debug)]