OpenSSL's Configure script is missing a shebang. On some platforms,
execve falls back to execution with the shell. Some other platforms,
like musl, will fail with an exec format error. Avoid this by calling
perl explicitly (since it's a perl script).

cc rust-lang#44270

Fixes rust-lang#44429.

So that you can scroll down the list of labels along with these
explanations.

Fixes rust-lang#44461

Fixes rust-lang#44463.

Closes rust-lang#44419

It's going to be backported to beta.

Explicitly run perl for OpenSSL Configure

OpenSSL's Configure script is missing a shebang. On some platforms,
execve falls back to execution with the shell. Some other platforms,
like musl, will fail with an exec format error. Avoid this by calling
perl explicitly (since it's a perl script).

…=QuietMisdreavus

Fix rendering of const keyword for functions

Fixes rust-lang#44187.

r? @QuietMisdreavus

…crichton

Attempt to fix the component manifest problem for rls-preview

cc rust-lang#44270

See rust-lang#44270

…etMisdreavus

rustdoc: Don't counts ids twice when using --enable-commonmark

cc @GuillaumeGomez
r? @QuietMisdreavus

Implement named threads on Windows (v2)

https://msdn.microsoft.com/en-us/library/windows/desktop/mt774976(v=vs.85).aspx

Windows 10 version 1607 finally added a sensible API for naming threads, so we can now implement named threads without having to use MSVC compiler extensions like before. VS2017s debugger and the WPA profiler already use this API where available, but other tools may need some time to catch up.

![thread](https://user-images.githubusercontent.com/3153547/30133438-c92a3cda-934b-11e7-9668-915d53e8d860.png)

…=frewsxcv

Clarify the behavior of UDP sockets wrt. multiple addresses in `connect`

CC @frewsxcv rust-lang#22569 rust-lang#44209

…richton

update mdbook

This eliminates some warnings

r? @alexcrichton

Add `impl From<Vec<Span>> for MultiSpan`.

A simple `impl`.

r? @nrc

…ewsxcv

Add doc example to String::as_mut_str

Fixes rust-lang#44429.

Add short doc examples for str::from_utf8_mut

Fixes rust-lang#44462

…on, r=Mark-Simulacrum

Update label explanations

Some of the newer labels weren't covered in CONTRIBUTING.md :)

r? @Mark-Simulacrum

Add doc examples to str::from_utf8_unchecked_mut

Fixes rust-lang#44461

Added an example for `std::str::into_boxed_bytes()`

This solves issue rust-lang#44423.

Add doc example to str::from_boxed_utf8_unchecked

Fixes rust-lang#44463.

Add an example of std::str::encode_utf16

Closes rust-lang#44419

Fix drain_filter doctest.

Fixes rust-lang#44499.

Also change some of the hidden logic in the doctest as a regression test; two bugs in the original would now cause test failure.

Fix example in transmute; add safety requirement to Vec::from_raw_parts

This fixes the second bullet point on rust-lang#44281 and also removes some incorrect information.

…QuietMisdreavus

Openoptions docs

r? @QuietMisdreavus

update "since" for discriminant_value

It's [going](rust-lang#44263 (comment)) to be backported to beta.

r? @alexcrichton

Remove unneeded `loop`.

None