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Clarify how deref coercions interact with traits #3670

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Clarify how deref coercions interact with traits #3670

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9 changes: 9 additions & 0 deletions src/ch15-02-deref.md
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Expand Up @@ -294,6 +294,15 @@ initial immutable reference is the only immutable reference to that data, but
the borrowing rules don’t guarantee that. Therefore, Rust can’t make the
assumption that converting an immutable reference to a mutable reference is
possible.

### Deref Coercion and Traits

The compiler only performs deref coercion when matching traits if the trait method is
called via the dot operator (e.g `x.into()`), and not when the method is called
using 'fully-qualified' syntax (e.g `SomeType::from(&x)`).

For more information, see the [Nomicon][nomicon-coercions].

[impl-trait]: ch10-02-traits.html#implementing-a-trait-on-a-type
[tuple-structs]: ch05-01-defining-structs.html#using-tuple-structs-without-named-fields-to-create-different-types
[nomicon-coercions]: https://doc.rust-lang.org/nomicon/coercions.html