Remove redundant variable in LruCache::put
Eliminate unecessary extra sigil node from LruCache.

Instead of allocating both head and tail nodes for the ends of the node
list, a single node can be allocated and linked circularly instead,
making it act as both the head and the tail of the list at the same
time.
Use more precise span when reporting semicolon hint

When reporting "consider removing this semicolon" hint message, the
offending semicolon may come from macro call site instead of macro
itself. Using the more appropriate span makes the hint more helpful.

Closes #13428.
doc: add webfonts and tweak the styles accordingly
green: Fix missing Send bounds on procedures

These were mistakenly not updated as part of the removal of the Send bound by
default on procedures.

cc #13629
mk: Pass exact compile to rustc on cross compiles

Instead of passing through CC which may have things like ccache and other
arguments (when using clang) this commit filters out the necessary arguments
from CC to pass the right linker to rustc.

Closes #13562
Eliminate the need for Options in LruEntry.

LruEntry nodes previously used Option to encapsulate the key and value
fields. This was used merely as a way avoid having values for the sigil
node. Apart from wasting a few bytes for the discriminant, this
cluttered the rest of the code, since these fields always contained
Some on regular nodes as a class invariant.

The Option wrapping was removed, and the values in the sigil field are
initialized using mem::init, so that they don't contain any real data.
Added run_flags directive to `compiletest`

Now it is possible to specify run-flags in tests. For example, by using `run-flags: --bench` the Bencher is run.
doc: unifying with rustdoc

Conflicts:
	src/doc/rust.md
Fix misspellings in comments.
shootout-threadring rewrite

* simplify the code
* remove trace to satisfy official shootout test
* use libgreen to improve performances
auto merge of #13553 : aochagavia/rust/pr, r=alexcrichton

Now it is possible to specify run-flags in tests. For example, by using `run-flags: --bench` the Bencher is run.
auto merge of #13656 : TeXitoi/rust/shootout-threadring-rewrite, r=alexcrichton

* simplify the code
* remove trace to satisfy official shootout test
* use libgreen to improve performances
auto merge of #13631 : alexcrichton/rust/fix-mk-cross, r=brson

Instead of passing through CC which may have things like ccache and other
arguments (when using clang) this commit filters out the necessary arguments
from CC to pass the right linker to rustc.

Closes #13562
Just some general cleanup in the HashMap module

I went through the HashMap module, fixed spelling mistakes, minor
inefficiencies, added tests, and other trivial changes.
auto merge of #13435 : edwardw/rust/span, r=brson

When reporting "consider removing this semicolon" hint message, the
offending semicolon may come from macro call site instead of macro
itself. Using the more appropriate span makes the hint more helpful.

Closes #13428.
auto merge of #13587 : adrientetar/rust/more-docs, r=brson

- Use Fira Sans for headlines, Heuristica for the body (Adobe Utopia derivative). Both are licensed under the SIL OFL license. (I didn't include BoldItalic because it is sparingly used.)
- Split TOC into 2 columns for the docs except manual (too tall, too wide to be readable).
- Some fixes to rustdoc, bring styles in coherency with eachother
- A few tweaks

Two examples: [modified tutorial](http://adrientetar.legtux.org/cached/rust-docs/tutorial.htm) and [modified manual](http://adrientetar.legtux.org/cached/rust-docs/manual.htm).

Rustdoc got some fixes, here is [modified `enum.FileType`](http://adrientetar.legtux.org/cached/rust-docs/enum.FileType.htm), [modified `std`](http://adrientetar.legtux.org/cached/rust-docs/std.htm) and [modified `std::io`](http://adrientetar.legtux.org/cached/rust-docs/io.htm).

#13484, #13485 follow-up.

cc @brson
auto merge of #13618 : yuriks/rust/lru-cache, r=brson

Just a few space saving optimizations that end up making the code less cluttered too. I'd like to someone to review the last commit closely, I don't have much experience with writing unsafe code, I had someone walk me through how to use cast::forget in IRC.
Fix ICE when reporting closure and proc mismatch

Closes #13599
auto merge of #13630 : alexcrichton/rust/correct-green-bounds, r=brson

These were mistakenly not updated as part of the removal of the Send bound by
default on procedures.

cc #13629