The new messages seem universally better. I think these result because
we recognize that we are in an invariant context more often.

Apparently LLVM has exponential code growth while inlining landing pads
if that attribute is present.

Fixes rust-lang#41696.

Closes rust-lang#31905

Operand: 72 -> 24 B
Statement: 192 -> 96 B
Terminator: 256 -> 112 B
librustc translation memory usage: 1795 -> 1669 MB

next step would be interning lvalues, I suppose?

…ichton

Windows io::Error: also format NTSTATUS error codes

`NTSTATUS` errors may be encoded as `HRESULT`, see [[MS-ERREF]](https://msdn.microsoft.com/en-us/library/cc231198.aspx). These error codes can still be formatted using `FormatMessageW` but require some different parameters to be passed in.

I wasn't sure if this needed a test and if so, how to test it. Presumably we wouldn't want to make our tests dependent on localization-dependent strings returned from `FormatMessageW`.

Users that get an `err: NTSTATUS` will need to do `io::Error::from_raw_os_error(err|0x1000_0000)` (the equivalent of [`HRESULT_FROM_NT`](https://msdn.microsoft.com/en-us/library/ms693780(VS.85).aspx))

enforce WF conditions after generalizing

Add a `WF(T')` obligation after generalizing `T` to `T'`, if `T'` contains an unconstrained type variable in a bivariant context.

Fixes rust-lang#41677.

Beta nominating -- regression.

r? @arielb1

bootstrap: Output name of failed config in case of errors

Remove wrong or outdated info from CString docs.

None

doc: break into 2 sentences

Number of filtered out tests in tests summary

Closes rust-lang#31905

Upgrade some comments to doc comments

Fix typo in Iterator::size_hint example comment

Annotate the license exceptions

Include the crate's root module in save-analysis

r? @eddyb

remove the #[inline] attribute from drop_in_place

Apparently LLVM has exponential code growth while inlining landing pads
if that attribute is present.

Fixes rust-lang#41696.

beta-nominating  because regression.
r? @eddyb

…steveklabnik

Fix search when looking to sources

Before:

<img width="1440" alt="screen shot 2017-05-11 at 22 33 28" src="https://cloud.githubusercontent.com/assets/3050060/25970761/03fd2ade-369a-11e7-9fd6-783c23455589.png">

After:

<img width="1440" alt="screen shot 2017-05-11 at 22 34 05" src="https://cloud.githubusercontent.com/assets/3050060/25970770/09ac71ce-369a-11e7-9038-559f414e07b5.png">

r? @rust-lang/docs

rustc_trans: do not attempt to truncate an i1 const to i1.

Fixes rust-lang#41744 by skipping the truncation when it'd be a noop anyway.

box large variants in MIR

Operand: 72 -> 24 B
Statement: 192 -> 96 B
Terminator: 256 -> 112 B
librustc translation memory usage: 1795 -> 1669 MB

next step would be interning lvalues, I suppose?

cc rust-lang#36799 (@urschrei - does ostn15_phf compile with this PR?)

r? @eddyb