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minor clarification about deriving Copy and Clone #2627

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Feb 23, 2021
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minor clarification about deriving Copy and Clone #2627

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8 changes: 4 additions & 4 deletions src/appendix-03-derivable-traits.md
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Expand Up @@ -134,10 +134,10 @@ overloading those methods and violating the assumption that no arbitrary code
is being run. That way, all programmers can assume that copying a value will be
very fast.

You can derive `Copy` on any type whose parts all implement `Copy`. You can
only apply the `Copy` trait to types that also implement `Clone`, because a
type that implements `Copy` has a trivial implementation of `Clone` that
performs the same task as `Copy`.
You can derive `Copy` on any type whose parts all implement `Copy`. A type that
implements `Copy` must also implement `Clone`, because a type that implements
`Copy` has a trivial implementation of `Clone` that performs the same task as
`Copy`.

The `Copy` trait is rarely required; types that implement `Copy` have
optimizations available, meaning you don’t have to call `clone`, which makes
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