Fix broken links in various parts of the docs.
I also found a dead link [here](http://doc.rust-lang.org/nightly/alloc/boxed/) (the first link on the page), but the chapter of the book that it used to point at seems to be gone, and I'm not sure what should happen to that link.
When emmitting a note, previously it was not known if the note was for an error or a
warning. If it was for a warning, then with `-Awarnings` it should not have been print.
The `emit_for` function allows someone to specify which level should determine its visibility.
An example:
```rust
extern crate \"std\" as std2;
fn main() {}
```
When compiling with `-Awarnings`, this would previously emit `note: use an identifier not in quotes instead` (and nothing else).
With this patch, it will be completely silent as expected.
Fix Debug impl for RangeFull
The Debug impl was using quotes, which was inconsistent:
=> (.., 1.., 2..3, ..4)
(\"..\", 1.., 2..3, ..4)
Fix to use just ..
typeck: Do high-level structural/signature checks before function body checks.
This avoids various ICEs, e.g. premature calls to cat_expr that yield the dreaded "cat_expr Errd" ICE.
However, it also means that some early error feedback is now not provided. This may be for the best, because the error feedback were were providing in some of those cases were false positives -- it was spurious feedback and a distraction from the real problem.
So it is not 100% clear whether we actually want to put this change in or not. I think its a net win, but others might disagree.
(Kudos to @arielb1 for suggesting this modification.)
(The cast from the 64-bit value to isize was using the lower 32-bits,
which led to it being treated as a large positive value rather than a
smallish negative one. The fix was to use the same bits for the upper-
and lower- 32 bits.)
A few final improvements to rustdoc for 1.0:
* Improve how rustdoc handles stability
* Fix cross-crate macro source links
* Improve experience of types inheriting methods through `Deref`
Some more details can be found in the commits.
[Preview](http://people.mozilla.org/~acrichton/doc/std/)
Whenever a type implements Deref, rustdoc will now add a section to the "methods
available" sections for "Methods from Deref<Target=Foo>", listing all the
inherent methods of the type `Foo`.
Closes#19190
