Backport of PRs to Beta #25192
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Backport of PRs to Beta #25192
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…d behavior [breaking-change] Technically breaking, since code that had been using these transmutes before will no longer compile. However, it was undefined behavior, so really, it's a good thing. Fixing your code would require some re-working to use an UnsafeCell instead. Closes rust-lang#13146
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These implementations were intended to be unstable, but currently the stability attributes cannot handle a stable trait with an unstable `impl` block. This commit also audits the rest of the standard library for explicitly-`#[unstable]` impl blocks. No others were removed but some annotations were changed to `#[stable]` as they're defacto stable anyway. One particularly interesting `impl` marked `#[stable]` as part of this commit is the `Add<&[T]>` impl for `Vec<T>`, which uses `push_all` and implicitly clones all elements of the vector provided. Closes rust-lang#24791 Conflicts: src/libcoretest/slice.rs src/librustc_driver/lib.rs
As pointed out in rust-lang#17136 the semantics of a `BufStream` aren't always what one expects, and it looks like other [languages like C#][c-sharp] implement a buffered stream with only one underlying buffer. For now this commit destabilizes the primitive in the `std::io` module to give us some more time in figuring out what to do with it. [c-sharp]: https://msdn.microsoft.com/en-us/library/system.io.bufferedstream%28v=vs.110%29.aspx [breaking-change]
Conflicts: src/libstd/sync/rwlock.rs
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Ideally this trait implementation would be unstable, requiring crates to opt-in if they would like the functionality, but that's not currently how stability works so the implementation needs to be removed entirely. This may come back at a future date, but for now the conservative option is to remove it. [breaking-change] Conflicts: src/libcollections/vec.rs
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Backports of the following PRs: