The current setup processes impl/trait items while visiting
the impl/trait. This means we basically have this setup:

    <Lots> -> TypeckItemBody(Impl) -> Tables(ImplItem{0,1,2,3})

But this was largely an artifact of the older code. By moving the
processing of items into method dedicated for their use, we produce this
setup:

    <Little> -> TypeckItemBody(ImplItem0) -> Tables(ImplItem0)
    ...
    <Little> -> TypeckItemBody(ImplItem3) -> Tables(ImplItem3)

Rollup of 6 pull requests

- Successful merges: #38930, #39212, #39251, #39267, #39276, #39278
- Failed merges:

fix book: refer to `add_two` as "tested function"

refer to `add_two` as "tested function" rather than "test function", which would be `it_works`

Add missing urls for array docs

r? @frewsxcv

doc comment rewording

Remove a FIXME in core/hash tests

Removes a FIXME

Use libc errno in Redox submodule

This fixes https://github.com/redox-os/redox/issues/830, and is necessary when using libc in Redox

Updates to src/libcore/ops.rs docs for RFC#1228 (Placement Left Arrow)

Also fixed a minor typo in docs for `core::ops::Place`.

save-analysis: polishing paths

a couple of minor changes that get us better coverage of different paths.

r? @EddyB

Update Fuchsia support for std::process.

- Adds support for try_wait.
- Miscellaneous updates to keep up with Magenta changes.

I'll begin `sys/fuchsia` soon, just been bogged down with my actual job lately (I'm not on the Fuchsia team).

Catches generic types in paths

This is actually kinda hard to hit, but it fixes missing the `foo` in `for _ in foo {}`.

exclusive range patterns

adds `..` patterns to the language under a feature gate (`exclusive_range_pattern`).

This allows turning

``` rust
match i {
    0...9 => {},
    10...19 => {},
    20...29 => {},
    _ => {}
}
```

into

``` rust
match i {
    0..10 => {},
    10..20 => {},
    20..30 => {},
    _ => {}
}
```

rustbuild: Start building --enable-extended

This commit adds a new flag to the configure script,
`--enable-extended`, which is intended for specifying a desire to
compile the full suite of Rust tools such as Cargo, the RLS, etc. This
is also an indication that the build system should create combined
installers such as the pkg/exe/msi artifacts.

Currently the `--enable-extended` flag just indicates that combined
installers should be built, and Cargo is itself not compiled just yet
but rather only downloaded from its location. The intention here is to
quickly get to feature parity with the current release process and then
we can start improving it afterwards.

All new files in this PR inside `src/etc/installer` are copied from the
rust-packaging repository.

cc #38531

This commit adds a new flag to the configure script,
`--enable-extended`, which is intended for specifying a desire to
compile the full suite of Rust tools such as Cargo, the RLS, etc. This
is also an indication that the build system should create combined
installers such as the pkg/exe/msi artifacts.

Currently the `--enable-extended` flag just indicates that combined
installers should be built, and Cargo is itself not compiled just yet
but rather only downloaded from its location. The intention here is to
quickly get to feature parity with the current release process and then
we can start improving it afterwards.

All new files in this PR inside `src/etc/installer` are copied from the
rust-packaging repository.

rather than "test function", which would be `it_works`

Updated Fuchsia support for std::process. Adds support for try_wait. Misc. updates to reflect changes in Magenta

Force backline on all where in docs

Pictures are better than words in this case:

Before:

<img width="1440" alt="screen shot 2017-01-21 at 15 34 27" src="https://cloud.githubusercontent.com/assets/3050060/22175139/6e7c75d8-dfef-11e6-9904-023d63e609d2.png">

After:

<img width="1440" alt="screen shot 2017-01-21 at 15 34 32" src="https://cloud.githubusercontent.com/assets/3050060/22175140/75cc3846-dfef-11e6-9799-fffb213653e4.png">

r? @steveklabnik

cc @rust-lang/docs

Fix multiple labels when some don't have message

The diagnostic emitter now accounts for labels with no text message, presenting the underline on its own, without drawing the line for the non existing message below it. Go from

```
error: foo
 --> test.rs:3:6
  |
3 |   a { b { c } d }
  |   ----^^^^^^^----
  |   |   |
  |   |   `b` is a good letter
  |
```

to

```
error: foo
 --> test.rs:3:6
  |
3 |   a { b { c } d }
  |   ----^^^^^^^----
  |       |
  |       `b` is a good letter
```

from

```
error: foo
 --> test.rs:3:6
  |
3 |   a { b { c } d }
  |   ^^^^-------^^^^
  |   |   |
  |   |
  |   `a` is a good letter
```

to

```
error: foo
 --> test.rs:3:6
  |
3 |   a { b { c } d }
  |   ^^^^-------^^^^ `a` is a good letter
```

and from

```
error: foo
 --> test.rs:3:6
  |
3 |   a { b { c } d }
  |   ^^^^-------^^^^
  |   |   |
  |   |
  |
```

to

```
error: foo
 --> test.rs:3:6
  |
3 |   a { b { c } d }
  |   ^^^^-------^^^^
```
r? @nikomatsakis
cc @jonathandturner, @GuillaumeGomez, @nrc

Refactor `TokenStream`

r? @nrc

Add an option to the parser so cfg'ed out modules can still be parsed

r? @jseyfried

cc @dtolnay, @erickt it would be great if we could get this picked up into Syntex asap - it fixes a pretty nasty bug in Rustfmt.

travis: Enable testing i686 musl

This fixes the final issues with the target related to unwinding by disabling
removal of frame pointers.

impl ToSocketAddrs for String

`ToSocketAddrs` is implemented for a number of different types,
including `(IpAddr, u16)`, `&str`, and various others, for the
convenience of being able to run things like
`TcpListener::bind("10.11.12.13:1415")`.  However, because this is a
generic parameter with a trait bound, if you have a `String` you cannot
pass it in, either directly as `TcpListener::bind(string)`, or the
`TcpListener::bind(&string)` as you might expect due to deref coercion;
you have to use `TcpListener::bind(&*string)`, which is noisy and hard
to discover (though #39029 suggests better error messages to make it
more discoverable).

Rather than making people stumble over this, just implement
`ToSocketAddrs` for `String`.

Rollup of 7 pull requests

- Successful merges: #38794, #38956, #38993, #39191, #39200, #39233, #39258
- Failed merges:

build: Mention rustbuild in Makefile.in comments

I think this patch will help newcomers like myself with the build system. I didn't understand that the make targets listed in the Makefile.in comments only worked with the old system, until it was pointed out to me in #39256.

Add more references between lowercase/uppercase operations.

None

Docs for atomic orderings: link to the 'nomicon article for further reading

book: size and align in trait object vtables are used

The book currently claims that the `size` and `align` fields in the
trait object vtable are not used, but this is false. These two fields
are used by the stable `mem::size_of_val` and `mem::align_of_val`
functions.

See the `ty::TyDynamic` case of the `glue::size_and_align_of_dst`
function in librustc_trans, which is used to implement both intrinsics
in the unsized case.

r? @steveklabnik

Add `&mut expr` to syntax index

Update struct_expr grammar for field init shorthand.

Part of the work for #38830 .

r? @steveklabnik

book: match enum warning

Matching enums with named fields in the previous way yielded the "non_shorthand_field_patterns" warning.
The new code shows the shorthand syntax as well as field renaming, so it should be exhaustive ;-)

Adding missing URL to release notes