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4 changes: 3 additions & 1 deletion src/doc/reference.md
Original file line number Diff line number Diff line change
Expand Up @@ -3529,7 +3529,9 @@ The actual implementation for each vtable entry can vary on an object-by-object
basis.

Note that for a trait object to be instantiated, the trait must be
_object-safe_. Object safety rules are defined in [RFC 255][rfc255].
_object-safe_. Object safety rules are defined in [RFC 255].

[RFC 255]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md

Given a pointer-typed expression `E` of type `&T` or `Box<T>`, where `T`
implements trait `R`, casting `E` to the corresponding pointer type `&R` or
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