auto merge of #9636 : alexcrichton/rust/rustdoc, r=huonw

Commits have all the juicy details.

Import thing to note in this pull request is that `rustdoc html crate.rs` becomes `rustdoc crate.rs`
auto merge of #9644 : alexcrichton/rust/clarify, r=huonw

It was a little ambiguous before how explicitl positional parameters and
implicit positional parameters intermingled, and this clarifies how the two
intermingle. This also updates a little bit of documentation/code examples
elsewhere as well.
auto merge of #9645 : dckc/rust/patch-2, r=catamorphism

the switch from package `hello` to `pkg_id` is a little jarring; I'd use `<var>` but I don't see how. ALL_CAPS i.e. PKG_ID seems like a reasonable  poor-man's `<var>`.
fix tests for check-fast.
fix tests for check-fast.
incoporate suggestion from huonw to move code into lint.rs
Change the format! statics to be all-caps

This lets them get past the non_uppercase_statics lint mode (if it's turned on)

Closes #9631
Fix usage of the old debug! macros
auto merge of #9659 : alexcrichton/rust/fix-fmt, r=huonw

I was a little too trigger-happy in migrating from `format!` to `fmt!`...
auto merge of #9633 : alexcrichton/rust/issue-9631, r=huonw

Closes #9631
remove the `float` type

It is simply defined as `f64` across every platform right now.

A use case hasn't been presented for a `float` type defined as the
highest precision floating point type implemented in hardware on the
platform. Performance-wise, using the smallest precision correct for the
use case greatly saves on cache space and allows for fitting more
numbers into SSE/AVX registers.

If there was a use case, this could be implemented as simply a type
alias or a struct thanks to `#[cfg(...)]`.

Closes #6592

The mailing list thread, for reference:

https://mail.mozilla.org/pipermail/rust-dev/2013-July/004632.html
auto merge of #9519 : thestinger/rust/float, r=catamorphism

It is simply defined as `f64` across every platform right now.

A use case hasn't been presented for a `float` type defined as the
highest precision floating point type implemented in hardware on the
platform. Performance-wise, using the smallest precision correct for the
use case greatly saves on cache space and allows for fitting more
numbers into SSE/AVX registers.

If there was a use case, this could be implemented as simply a type
alias or a struct thanks to `#[cfg(...)]`.

Closes #6592

The mailing list thread, for reference:

https://mail.mozilla.org/pipermail/rust-dev/2013-July/004632.html
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librustc: Inline cross-crate tuple struct constructors
auto merge of #9560 : pcwalton/rust/xc-tuple-structs, r=pcwalton

r? @thestinger
Obsolete parsing 'loop' as 'continue'
Migrate users of 'loop' to 'continue'

Closes #9467
Move the rt::io::process tests to run-pass

Closes #9341
auto merge of #9578 : alexcrichton/rust/un-ignore-libuv-process-tests, r=brson

Closes #9341
syntax: remove some dead code.