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Rollup merge of #81879 - imbrem:make-reverse-repr-transparent, r=m-ou-se

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Added #[repr(transparent)] to core::cmp::Reverse

I found casting from an `&T` to an `&Reverse<T>` potentially useful, but found that `Reverse` was not `#[repr(transparent)]`, so after asking about it [on Reddit](https://www.reddit.com/r/rust/comments/le60uv/make_stdcmpreverse_reprtransparent_and_add_a/), I decided to go ahead and make a pull request which simply adds the attribute to the struct.
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Mara Bos 2021-03-09 09:05:19 +00:00 committed by GitHub
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library/core/src/cmp.rs
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@ -579,6 +579,7 @@ impl Ordering {
/// ``` /// ```
#[derive(PartialEq, Eq, Debug, Copy, Clone, Default, Hash)] #[derive(PartialEq, Eq, Debug, Copy, Clone, Default, Hash)]
#[stable(feature = "reverse_cmp_key", since = "1.19.0")] #[stable(feature = "reverse_cmp_key", since = "1.19.0")]
#[repr(transparent)]
pub struct Reverse<T>(#[stable(feature = "reverse_cmp_key", since = "1.19.0")] pub T); pub struct Reverse<T>(#[stable(feature = "reverse_cmp_key", since = "1.19.0")] pub T);
#[stable(feature = "reverse_cmp_key", since = "1.19.0")] #[stable(feature = "reverse_cmp_key", since = "1.19.0")]