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Rollup merge of #47125 - daboross:patch-3, r=estebank

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Mention SliceConcatExt's stability in its docs

Just saw someone in IRC mention there being no stable way to join string slices! It isn't entirely clear from the rust documentation that `SliceConcatExt` is usable. While this is mentioned in https://doc.rust-lang.org/std/prelude/, the trait has nothing to indicate that it's currently usable if found via a documentation search.

The wording on this could probably be improved, but I'm hoping its better than nothing.
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kennytm 2018-01-03 16:58:02 +08:00 committed by GitHub
commit bf3fd1744c
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src/liballoc/slice.rs
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@ -1725,6 +1725,14 @@ impl [u8] {
reason = "trait should not have to exist",
issue = "27747")]
/// An extension trait for concatenating slices
///
/// While this trait is unstable, the methods are stable. `SliceConcatExt` is
/// included in the [standard library prelude], so you can use [`join()`] and
/// [`concat()`] as if they existed on `[T]` itself.
///
/// [standard library prelude]: ../../std/prelude/index.html
/// [`join()`]: #tymethod.join
/// [`concat()`]: #tymethod.concat
pub trait SliceConcatExt<T: ?Sized> {
#[unstable(feature = "slice_concat_ext",
reason = "trait should not have to exist",