I went through the HashMap module, fixed spelling mistakes, minor inefficiencies, added tests, and other trivial changes. Hopefully this won't be a controversial PR.

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

cc #13629

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.

- 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

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.

I went through the HashMap module, fixed spelling mistakes, minor
inefficiencies, added tests, and other trivial changes.

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

* simplify the code
* remove trace to satisfy official shootout test
* use libgreen to improve performances

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

* simplify the code
* remove trace to satisfy official shootout test
* use libgreen to improve performances

Feels strange to have the order be arbitrary here. Order them the same.

This gives a better NOTE error message when a privacy error is encountered with
a static method. Previously no note was emitted (due to lack of support), but
now a note is emitted indicating that the struct/enum itself is private.

Closes #13641

The fields of tuple structs recently gained the ability to have privacy
associated with them, but rustdoc was not updated accodingly. This moves the
struct field filtering to the rendering phase in order to preserve the ordering
of struct fields to allow tuple structs to have their private fields printed as
underscores.

Closes #13594

Refactors all uses of ty_vec and associated things to remove the vstore abstraction (still used for strings, for now). Pointers to vectors are stored as ty_rptr or ty_uniq wrapped around a ty_vec. There are no user-facing changes. Existing behaviour is preserved by special-casing many instances of pointers containing vectors. Hopefully with DST most of these hacks will go away. For now it is useful to leave them hanging around rather than abstracting them into a method or something.

Closes #13554.

The fields of tuple structs recently gained the ability to have privacy
associated with them, but rustdoc was not updated accodingly. This moves the
struct field filtering to the rendering phase in order to preserve the ordering
of struct fields to allow tuple structs to have their private fields printed as
underscores.

Closes #13594

This gives a better NOTE error message when a privacy error is encountered with
a static method. Previously no note was emitted (due to lack of support), but
now a note is emitted indicating that the struct/enum itself is private.

Closes #13641

This commit removes the compiler support for floating point modulus operations,
as well as from the language. An implementation for this operator is now
required to be provided by libraries.

Floating point modulus is rarely used, doesn't exist in C, and is always lowered
to an fmod library call by LLVM, and LLVM is considering removing support
entirely.

Closes #12278

Fixed a typo in the documentation of std::mem, and refactored a function to use match instead of if.

Also added a FIXME to the benchmarks at the end of the file stating that they should be moved to another place, because they have nothing to do with `mem` (see https://github.com/mozilla/rust/issues/13642)

Conflicts:
	src/doc/rust.md

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

Fixed a typo in the documentation of std::mem, and refactored a function to use match instead of if.

Also added a FIXME to the benchmarks at the end of the file stating that they should be moved to another place, because they have nothing to do with `mem` (see https://github.com/mozilla/rust/issues/13642)