Fixes rust-lang#34798

And libcore/benches

cc rust-lang#39569 -- almost certainly a fix for that

Signed-off-by: Marc-Antoine Perennou <[email protected]>

* Moved algorithm explanation to module docs
* Added ``` before and after the examples
* Explanation of the `rbox`, `ibox` and `cbox` names
* Added docs about the breaking types to `Breaks`

Signed-off-by: Marc-Antoine Perennou <[email protected]>

This landed on beta in rust-lang#39546 and this is bringing the patch back to master.

Right now all Cargo release tarballs are 'nightly', they're not on the standard
channels yet.

Even more SNAP cleanup.

Added Default impl to PathBuf

Improve error message for uninferrable types rust-lang#38812

Hello,

I tried to improve the error message for uninferrable types. The error code is `E0282`.

```rust

error[E0282]: type annotations needed
 --> /home/cengizIO/issue38812.rs:2:11
  |
2 |   let x = vec![];
  |       -   ^^^^^^ cannot infer type for `T`
  |       |
  |       consider giving `x` a type
  |
  = note: this error originates in a macro outside of the current crate
```

and

```rust

error[E0282]: type annotations needed
 --> /home/cengizIO/issue38812.rs:2:15
  |
2 |   let (x,) = (vec![],);
  |       ----    ^^^^^^ cannot infer type for `T`
  |       |
  |       consider giving a type to pattern
  |
  = note: this error originates in a macro outside of the current crate
```

Rust compiler now tries to find uninferred `local`s with type `_` and adds them into the error message.

I'm probably wrong on wording that I used. Please feel free to suggest better alternatives.

Thanks @nikomatsakis for mentoring 🍺

Any comments/feedback is more than welcome!

Thank you

Add i686-unknown-netbsdelf target

lint/ctypes: Don't warn on sized structs with PhantomData.

Fixes rust-lang#34798

doc comment rewording

A few documentation improvements for `syntax::print::pp`

* Moved algorithm explanation to module docs
* Added ``` before and after the examples
* Explanation of the `rbox`, `ibox` and `cbox` names
* Added docs about the breaking types to `Breaks`

…lexcrichton

Extract collections benchmarks to libcollections/bench

Good suggestion from @stjepang rust-lang#39484 (comment)

r? @alexcrichton

… r=michaelwoerister

Handle the case where an intermediate node can't be recreated

This solution grows the graph, but this is quite the corner case.

r? @michaelwoerister

…, r=nikomatsakis

back: Limit the number of LLVM worker threads.

This should fix issue rust-lang#39568.
Also see rust-lang#39280.

r? @nikomatsakis

rustbuild: support setting verbosity in config.toml

Most if not all the configuration is settable trhough config.toml but the verbosity isn't yet.

This avoids having to pass -v to x.py on each command if you want verbosity to be always on.

Fix branch name Cargo's downloaded from

This landed on beta in rust-lang#39546 and this is bringing the patch back to master.

…brson

Fix a manifest-generation bug on beta

Right now all Cargo release tarballs are 'nightly', they're not on the standard
channels yet.

…aarch64-unknown-freebsd, r=alexcrichton

liblibc: Update to include `aarch64-unknown-freebsd` support

Fix ICE when accessing mutably an immutable enum

Fix rust-lang#39544.

Unignore u128 test for stage 0,1

Even more SNAP cleanup.

Follow-up of rust-lang#39519.

Sorry, I didn't check twice.