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reference: clarify impl #29317

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Oct 27, 2015
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reference: clarify impl #29317

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10 changes: 5 additions & 5 deletions src/doc/reference.md
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Expand Up @@ -1520,11 +1520,11 @@ impl Shape for Circle {
```

It is possible to define an implementation without referring to a trait. The
methods in such an implementation can only be used as direct calls on the
values of the type that the implementation targets. In such an implementation,
the trait type and `for` after `impl` are omitted. Such implementations are
limited to nominal types (enums, structs), and the implementation must appear
in the same crate as the `self` type:
methods in such an implementation can only be used as direct calls on the values
of the type that the implementation targets. In such an implementation, the
trait type and `for` after `impl` are omitted. Such implementations are limited
to nominal types (enums, structs, trait objects), and the implementation must
appear in the same crate as the `self` type:

```
struct Point {x: i32, y: i32}
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