Update new_debug_unreachable

In latest master, smallvec has been updated. So we only update new_debug_unreachable to remove unmaintained dependencies.

Prevent panic when sysroot cannot be computed

Fixes #61377.

cc @rotty @rust-lang/rustdoc

r? @Manishearth

Rollup of 7 pull requests

Successful merges:

 - #61199 (Revert "Set test flag when rustdoc is running with --test option" )
 - #61755 (Add `--pass $mode` to compiletest through `./x.py`)
 - #61818 (Issue #60709 test)
 - #62023 (publish_toolstate: don't use 'new' from inside the loop)
 - #62104 (Inform the query system about properties of queries at compile time)
 - #62163 (Avoid mem::uninitialized() in std::sys::unix)
 - #62204 (doc(libcore) Fix CS)

Failed merges:

r? @ghost

doc(libcore) Fix CS

A small PR to fix a small CS typo in `iter/traits/collect.rs`.

Avoid mem::uninitialized() in std::sys::unix

For `libc` types that will be initialized in FFI calls, we can just use
`MaybeUninit` and then pass around raw pointers.

For `sun_path_offset()`, which really wants `offset_of`, all callers
have a real `sockaddr_un` available, so we can use that reference.

r? @RalfJung

Inform the query system about properties of queries at compile time

publish_toolstate: don't use 'new' from inside the loop

I think I made a mistake in https://github.com/rust-lang/rust/pull/61938 by using `new` outside the inner loop. This PR fixes that.

However, no issue got created at all for https://github.com/rust-lang/rust/pull/62003#issuecomment-504356964, and I don't know why that is.   The script should be [triggered by Traivs](https://github.com/rust-lang/rust/blob/56a12b2ad058f22f1ef090713df15598525ba4a4/.travis.yml#L240), and I can find no trace of that in [the build log](https://travis-ci.com/rust-lang/rust/jobs/209880042).

Issue #60709 test

Adds a test for #60709, which was fixed as part of #59897.

r? @cramertj

Add `--pass $mode` to compiletest through `./x.py`

Adds a flag `--pass $mode` to compiletest, which is exposed through `./x.py`.

When `--pass $mode` is passed, `{check,build,compile,run}-pass` tests will be forced to run under the given `$mode` unless the directive `// ignore-pass` exists in the test file.

The modes are explained in https://github.com/rust-lang/rust/pull/61778:
- `check` has the same effect as `cargo check`
- `build` or `compile` have the same effect as `cargo build`
- `run` has the same effect as `cargo run`

On my machine, `./x.py -i test src/test/run-pass --stage 1 --pass check` takes 38 seconds whereas it takes 2 min 7 seconds without `--pass check`.

cc https://github.com/rust-lang/rust/issues/61712

r? @petrochenkov

Revert "Set test flag when rustdoc is running with --test option"

Reverts https://github.com/rust-lang/rust/pull/59940.

It caused doctests in this repository to no longer be tested including all of the core crate.

Update miri

Fixes #62101

r? @RalfJung

Closes #60709.

Rollup of 16 pull requests

Successful merges:

 - #61878 (improve pinning projection docs)
 - #62043 (Remove `FnBox`)
 - #62067 (Add suggestion for missing `.await` keyword)
 - #62076 (Updated RELEASES.md for 1.36.0)
 - #62102 (call out explicitly that general read needs to be called with an initialized buffer)
 - #62106 (Add more tests for async/await)
 - #62124 (refactor lexer to use idiomatic borrowing)
 - #62131 (libsyntax: Fix some Clippy warnings)
 - #62152 (Don't ICE on item in `.await` expression)
 - #62154 (Remove old fixme)
 - #62155 (Add regression test for MIR drop generation in async loops)
 - #62156 (Update books)
 - #62160 (Remove outdated question_mark_macro_sep lint)
 - #62164 (save-analysis: use buffered writes)
 - #62171 (rustc: Retry SIGILL linker invocations)
 - #62176 (Update RLS)

Failed merges:

r? @ghost

A small PR to fix a small CS typo in `iter/traits/collect.rs`.

ci: Move most builders to Azure Pipelines

This commit disables all builders on Travis and almost all builders on
AppVeyor now that they're all running on Azure Pipelines. There is one
remaining builder on AppVeyor which hasn't been migrated yet due to a
test failure on Azure, which we'll be debugging soon. One remaining
builder is left on Travis which is the tools builder whenever a
submodule is changed, but we'll probably turn that off soon since it's
just for PRs.

The other major change in this PR is that the auto builders on Azure are
now configured with "real" prod credentials which should cause them to
publish all artifacts into the official CI buckets.

This commit disables all builders on Travis and almost all builders on
AppVeyor now that they're all running on Azure Pipelines. There is one
remaining builder on AppVeyor which hasn't been migrated yet due to a
test failure on Azure, which we'll be debugging soon. One remaining
builder is left on Travis which is the tools builder whenever a
submodule is changed, but we'll probably turn that off soon since it's
just for PRs.

The other major change in this PR is that the auto builders on Azure are
now configured with "real" prod credentials which should cause them to
publish all artifacts into the official CI buckets.

Update RLS

Merged PRs:
* fix(cmd): make clear_env_rust_log default to false (https://github.com/rust-lang/rls/pull/1486)
  - Retain `RUST_LOG` in `rls --cli` mode
* Pass --file-lines to rustfmt only if specified (https://github.com/rust-lang/rls/pull/1497)
  - Fix entire-file formatting when using external rustfmt (specified via `rustfmt_path` config)
* Ensure that --error-format is only passed once to `rustc` (https://github.com/rust-lang/rls/pull/1500)
  - Unbreaks RLS when used together with Cargo [pipelining build](https://github.com/rust-lang/rust/issues/60988) feature (@alexcrichton I'd consider this a stabilization blocker, mind adding it to the tracking issue for the record? :bowing_man: )

rustc: Retry SIGILL linker invocations

We've seen quite a few issues with spurious illegal instructions getting
executed on OSX on CI recently. For whatever reason `cc` itself is
executing an illegal instruction and we're not really getting any other
information about what's happening. Since we're already retrying the
linker when it segfaults, let's just continue to retry everything and
automatically reinvoke the linker when it fails with an illegal instruction.

save-analysis: use buffered writes

Otherwise it ends up writing the file byte at a time, which can be very slow for large outputs.

cc @ljw1004

Remove outdated question_mark_macro_sep lint

Update books

Update nomicon, reference, book, rust-by-example, rustc-guide

## nomicon

2 commits in c656171b749b7307f21371dd0d3278efee5573b8..341c221116a8b9f1010cf1eece952b80c5ec7f54
2019-04-25 15:31:26 -0400 to 2019-06-19 09:08:47 -0700
- Fix some links.
- cleanup the intro, and clarify how it relates to the reference (rust-lang-nursery/nomicon#140)

## reference

2 commits in 08ae27a4921ca53967656a7391c82f6c0ddd1ccc..7a5aab5fd50d6290679beb4cf42fa5f46ed22aec
2019-06-17 11:24:13 -0700 to 2019-06-20 17:38:52 +0200
- Update for cfg on generic parameter. (rust-lang-nursery/reference#624)
- Link to "const functions" section from constant expressions list (rust-lang-nursery/reference#623)

## book

2 commits in 9aacfcc4c5b102c8cda195932addefd32fe955d2..6c0d83499c8e77e06a71d28c5e1adccec278d4f3
2019-06-16 21:27:26 -0400 to 2019-06-23 20:25:30 -0400
- fancy quotes
- Edits made in copyedit

## rust-by-example

2 commits in b27472962986e85c94f4183b1a6d2207660d3ed6..62b3ff2cb44dd8b648c3ef2a9347c3706d148014
2019-06-17 15:52:07 -0300 to 2019-06-24 09:17:21 -0300
- A couple of fixes for the `Box, stack and heap` chapter. (rust-lang/rust-by-example#1206)
- [typo] Note, that it is -> Note that, it is (rust-lang/rust-by-example#1207)

## rustc-guide

38 commits in f55e97c145cf37fd664db2e0e2f2d05df328bf4f..abf512fc9cc969dcbea69aa15b44586bbeb13c2d
2019-06-15 17:29:12 -0500 to 2019-06-26 11:05:58 -0500
- fix long line
- add `point` to the glossary and link a use of it
- fix indentation
- Update src/borrow_check/region_inference/placeholders_and_universes.md
- Update src/borrow_check/region_inference/placeholders_and_universes.md
- Update src/borrow_check/region_inference/placeholders_and_universes.md
- Update src/borrow_check/region_inference/member_constraints.md
- Update src/borrow_check/region_inference/constraint_propagation.md
- Update src/borrow_check/region_inference/member_constraints.md
- Update src/borrow_check/region_inference/constraint_propagation.md
- Update src/borrow_check/region_inference/member_constraints.md
- Update src/borrow_check/region_inference/member_constraints.md
- Update src/borrow_check/region_inference/lifetime_parameters.md
- Update src/borrow_check/region_inference/member_constraints.md
- Update src/borrow_check/region_inference/constraint_propagation.md
- Update src/borrow_check/region_inference/constraint_propagation.md
- Update src/borrow_check/region_inference/constraint_propagation.md
- Update src/borrow_check/region_inference/constraint_propagation.md
- Update src/borrow_check/region_inference/constraint_propagation.md
- Update src/borrow_check/region_inference/constraint_propagation.md
- Update src/borrow_check/region_inference/constraint_propagation.md
- Update src/borrow_check/region_inference/lifetime_parameters.md
- Update src/borrow_check/region_inference/lifetime_parameters.md
- Update src/borrow_check/region_inference/lifetime_parameters.md
- Update src/borrow_check/region_inference/constraint_propagation.md
- adjust overview slightly
- describe region inference and member constraints in some detail
- start filling out the constraint propagation chapter in more detail
- break out parts of the region inference chapter into sub-chapters
- fix typo
- avoid ftp links
- fix broken links
- add bibligraphy appendix
- Update to mdbook-linkcheck 0.3.0
- Update mdbook
- Change stage0 cfg_attr to bootstrap
- fix compiler-team
- Added Rustc Debugger Support Chapter

Add regression test for MIR drop generation in async loops

Fixes #61986.

r? @Centril

Remove old fixme

fixed in https://github.com/rust-lang/rust/pull/60160

r? @Centril

Don't ICE on item in `.await` expression

The code for lowering a `.await` expression missed that item IDs may already have been assigned for items inside of an `async` block, or for closures. This change means we no longer exit early after finding a `.await` in a block that isn't `async` and instead just emit the error. This avoids an ICE generated due to item IDs not being densely generated. (The `YieldSource` of the generated `yield` expression is  used to avoid errors generated about having `yield` expressions outside of generator literals.)

r? @cramertj

Resolves #62009 and resolves #61685

libsyntax: Fix some Clippy warnings

When I was working on it before a lot of these popped up in the RLS so I figured I'll send a small patch fixing only the (hopefully) uncontroversial ones.

Others that could be also fixed included also [`clippy::print_with_newline`](https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline) and [`clippy::cast_lossless`](https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless). Should I add them as well?

since most of it touches libsyntax...
r? @petrochenkov

refactor lexer to use idiomatic borrowing

Add more tests for async/await

I'll follow up with more of these, but here's an initial few.

r? @Centril

call out explicitly that general read needs to be called with an initialized buffer

Updated RELEASES.md for 1.36.0

[Rendered](https://github.com/XAMPPRocky/rust/blob/master/RELEASES.md)

r? @Mark-Simulacrum

cc @rust-lang/release

Add suggestion for missing `.await` keyword

This commit adds a suggestion diagnostic for missing `.await`. In order to do this, the trait `Future` is promoted to a lang item.

Compiling code of the form:

```rust
#![feature(async_await)]

fn take_u32(x: u32) {}

async fn make_u32() -> u32 {
    22
}

async fn foo() {
    let x = make_u32();
    take_u32(x)
}

fn main() {}
```

Will now result in the suggestion:

```
error[E0308]: mismatched types
  --> src/main.rs:11:18
   |
11 |         take_u32(x)
   |                  ^
   |                  |
   |                  expected u32, found opaque type
   |                  help: consider using `.await` here: `x.await`
   |
   = note: expected type `u32`
              found type `impl std::future::Future`
```

This commit does not cover chained expressions and therefore only covers the case originally pointed out in #61076. Cases I can think of that still need to be covered:

- [ ] Return places for functions
- [ ] Field access
- [ ] Method invocation

I'm planning to submit PRs for each of these separately as and when I have figured them out.

Remove `FnBox`

Remove `FnBox` since we now have `Box<dyn FnOnce>`.

Closes https://github.com/rust-lang/rust/issues/28796.

r? @cramertj

improve pinning projection docs

This tries to improve the explanation of structural pinning and pinning projections based on [this URLO thread](https://users.rust-lang.org/t/when-is-it-safe-to-move-a-member-value-out-of-a-pinned-future/28182).

Fixes https://github.com/rust-lang/rust/issues/61272.

submodules: Update clippy from 8c80b65f to e3cb40e4

r? @Manishearth

We've seen quite a few issues with spurious illegal instructions getting
executed on OSX on CI recently. For whatever reason `cc` itself is
executing an illegal instruction and we're not really getting any other
information about what's happening. Since we're already retrying the
linker when it segfaults, let's just continue to retry everything and
automatically reinvoke the linker when it fails with an illegal instruction.

[CI] Rollup of 5 pull requests

Successful merges:

 - #62140 (ci: Turn off PR builds on Travis)
 - #62141 (ci: Disable assertions in PR builds)
 - #62142 (ci: Switch official `try` builds to happen on Azure)
 - #62143 (ci: Publish toolstate changes from Azure)
 - #62145 (ci: Sync AppVeyor/Travis with Azure configuration)

Failed merges:

r? @ghost

Otherwise it ends up writing the file byte at a time, which can be very slow for large outputs.