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docs(marker/copy): clarify that &T is also Copy

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In the current documentation about the `Copy` marker trait, there is a section
about "additional implementors", which list additional implementors of the `Copy` trait.
The fact that shared references are also `Copy` is mixed with another point,
which makes it hard to recognize and make it seem not as important.

This clarifies the fact that shared references are also `Copy`, by mentioning it as a
separate item in the list of "additional implementors".
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Jan Riemer 2020-08-02 14:57:19 +02:00 committed by GitHub
parent 1e99138078
commit 7835c8c06c
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1 changed files with 2 additions and 3 deletions
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library/core/src/marker.rs
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@ -347,9 +347,8 @@ pub trait StructuralEq {
/// * Tuple types, if each component also implements `Copy` (e.g., `()`, `(i32, bool)`)
/// * Closure types, if they capture no value from the environment
/// or if all such captured values implement `Copy` themselves.
/// Note that variables captured by shared reference always implement `Copy`
/// (even if the referent doesn't),
/// while variables captured by mutable reference never implement `Copy`.
/// * Variables captured by shared reference (e.g. `&T`) implement `Copy`, even if the referent (`T`) doesn't,
/// while variables captured by mutable reference (e.g. `&mut T`) never implement `Copy`.
///
/// [`Vec<T>`]: ../../std/vec/struct.Vec.html
/// [`String`]: ../../std/string/struct.String.html