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expand Copy docs #711

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Nov 4, 2019
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expand Copy docs #711

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8 changes: 6 additions & 2 deletions src/special-types-and-traits.md
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Expand Up @@ -60,8 +60,12 @@ type is to be destroyed.

The [`Copy`] trait changes the semantics of a type implementing it. Values
whose type implements `Copy` are copied rather than moved upon assignment.
`Copy` cannot be implemented for types which implement `Drop`, or which have
fields that are not `Copy`. `Copy` is implemented by the compiler for

`Copy` can only be implemented for types which do not implement `Drop`, and whose fields are all `Copy`.
For enums, this means all fields of all variants have to be `Copy`.
For unions, this means all variants have to be `Copy`.

`Copy` is implemented by the compiler for

* [Numeric types]
* `char`, `bool`, and [`!`]
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