The std::io::Write::write method currensly suggests consumers guaranteed
that `0 <= n <= buf.len()`, for `Ok(n)`, however `n` is of type `usize`
causing the compiler to emit a warning:
```
warning: comparison is useless due to type limits
 --> lib.rs:6:18
  |
6 |         Ok(n) => 0 <= n && n <= output.len(),
  |                  ^^^^^^
  |
  = note: #[warn(unused_comparisons)] on by default
```

This PR removes the suggestion to check `0 <= n` since it is moot.

r? @steveklabnik

ignore process-envs.rs and process-remove-from-env.rs as there is no 'env' on vxWorks

A recent commit modified toolstate to only push updated data when the
TOOLSTATE_PUBLISH environment variable is present. This worked fine on
Windows but failed on Linux, since Linux jobs run inside Docker
containers and the variable wasn't forwarded inside it.

This changes the Docker startup code to set the TOOLSTATE_PUBLISH
enviornment variable inside the container if it's present outside.

simplify std::io::Write::write rustdoc

The std::io::Write::write method currensly suggests consumers guaranteed
that `0 <= n <= buf.len()`, for `Ok(n)`, however `n` is of type `usize`
causing the compiler to emit a warning:
```
warning: comparison is useless due to type limits
 --> lib.rs:6:18
  |
6 |         Ok(n) => 0 <= n && n <= output.len(),
  |                  ^^^^^^
  |
  = note: #[warn(unused_comparisons)] on by default
```

This PR removes the suggestion to check `0 <= n` since it is moot.

r? @steveklabnik

…obody

Add keywords item into the sidebar

Fixes rust-lang#62939.

cc @pravic

screenshot of the result:

![Screenshot from 2019-07-25 14-29-48](https://user-images.githubusercontent.com/3050060/61874545-f9512080-aee8-11e9-8e8b-aa50216aec94.png)

r? @QuietMisdreavus

Account for `maybe_whole_expr` in range patterns

Fixes rust-lang#63115 (fallout from rust-lang#62550).

r? @petrochenkov

…tril

Add test for issue-58951

Closes rust-lang#58951

r? @Centril

cleanup StringReader fields

reduce visibility and replace `Lrc<SourceFile>` with `start_pos`: the single bit we actually *need* from the file.

r? @petrochenkov

update test cases for vxWorks

issue-2214.rs: lgamma is lgamma on vxWorks
ignore process-envs.rs and process-remove-from-env.rs as there is no 'env' on vxWorks

…xes, r=Centril

Fix typos in release notes.

…r=alexcrichton

ci: fix toolstate not pushing data for Linux

A recent commit modified toolstate to only push updated data when the `TOOLSTATE_PUBLISH` environment variable is present. This worked fine on Windows but failed on Linux, since Linux jobs run inside Docker containers and the variable wasn't forwarded inside it.

This changes the Docker startup code to set the `TOOLSTATE_PUBLISH` enviornment variable inside the container if it's present outside.

r? @alexcrichton
fixes rust-lang#63190