The args() and args_os() docs include a line about how the first element
is usually the program name. Include that line in the struct docs too.

… r? @steveklabnik

Makes the sidebar a light grey and highlights the currently viewed item
in the sidebar more prominently.

All visual design credit goes to @johnwhelchel (rust-lang#37856)

Fixes rust-lang#39733.

Fixes rust-lang#39201.

I've been seeing failures on the bots when building jemalloc and my assumption
is that it's because cwd isn't created. That may be possible if this
`create_dir_all` call change in this commit fails, in which case we ignore the
error.

This commit updates the location to call `create_dir_racy` which handles
concurrent invocations, as multiple build scripts may be trying to create the
`native` dir.

…tsakis

Add catch {} to AST

Part of rust-lang#39849. Builds on rust-lang#39864.

…frewsxcv

add unstable book to the bookshelf

r? @frewsxcv @GuillaumeGomez

…xcrichton

Extract nomicon to its own repo

part of rust-lang#39588

same as rust-lang#40213 but for the nomicon

r? @alexcrichton

… r=alexcrichton

Restore creating the channel-rust-$channel-date.txt files

I have **not** run this (because I don't know how to 😇), but it *does* compile.

r? @alexcrichton

Issue rust-lang#39688 - Help people find String::as_bytes() for UTF-8

Added in links for the inverse functions so people will know that as_bytes() is the inverse of from_utf8() and vice versa.
?r @steveklabnik

Fix description of closure coercion feature

Thanks to @whitequark for pointing this out.

…umeGomez

Improve the style of the sidebar in rustdoc output

Makes the sidebar a light grey and highlights the currently viewed item in the sidebar more prominently.

All visual design credit goes to @johnwhelchel (rust-lang#37856)

Sample screenshots:

![screen shot 2017-03-04 at 12 29 48 pm](https://cloud.githubusercontent.com/assets/831192/23580829/db6c26c2-00d6-11e7-8d89-822e25ba79f0.png)

![screen shot 2017-03-04 at 12 30 10 pm](https://cloud.githubusercontent.com/assets/831192/23580828/db69eeca-00d6-11e7-9f89-1e06fd3bf098.png)

![screen shot 2017-03-04 at 12 30 31 pm](https://cloud.githubusercontent.com/assets/831192/23580830/db6d00ce-00d6-11e7-89ca-cd03e148a121.png)

clarify docs for Args and ArgsOs

The args() and args_os() docs include a line about how the first element
is usually the program name. Include that line in the struct docs too.

Fix text formatting in README

There was a missing backtick in the README.

Remove extra space in test description (of a mod test)

Fix a typo in the docs

Update libc to 0.2.21

Update to include android aarch64 and x86 improvements.

…turon

README formatting in configure/make section

Tiny change to render the `config.mk` correctly

Added remove_from to vec.rs (rust-lang#38143)

Turns out that if you push to someone's PR branch and cause the PR to close, you lose delegation 😞.

@madseagames I'm really sorry about that 😭

…chton

Update link to COMPILER_TESTS.md in CONTRIBUTING.md

Link to compiler test documentation was broken after the file was moved by rust-lang#40086.
This updates the link to the new location of the file.

Add missing urls in some macros doc

r? @frewsxcv

Clarify handling of `src` in `ptr::write`

Fixes rust-lang#39733.

…eklabnik

Document why `str.to_{lower,upper}case` return `String`

Fixes rust-lang#39201.

rustbuild: Assert directory creation succeeds

I've been seeing failures on the bots when building jemalloc and my assumption
is that it's because cwd isn't created. That may be possible if this
`create_dir_all` call change in this commit fails, in which case we ignore the
error.

This commit updates the location to call `create_dir_racy` which handles
concurrent invocations, as multiple build scripts may be trying to create the
`native` dir.