Removes unused macros from:
  * libcore
  * libcollections
    The last use of these two macros was removed in commit
    b64c9d5
    when the char_range_at_reverse function was been removed.
  * librustc_errors
    Their last use was removed by commits
    2f2c3e1
    and 11dc974.
  * libsyntax_ext
  * librustc_trans
    Also, put the otry macro in back/msvc/mod.rs under the
    same cfg argument as the places that use it.

…full bootstrap

This fix an issue where the compiler panics even if there is no
error when passed with the `-Z treat-err-as-bug` option.

Fixes rust-lang#35886.

This prevents long names from overflowing.

Addresses rust-lang#18439.

bootstrap: Output name of failed config in case of errors

Remove wrong or outdated info from CString docs.

None

…agisa

Refactor suggestion diagnostic API to allow for multiple suggestions

r? @jonathandturner

cc @nrc @petrochenkov

doc: break into 2 sentences

Upgrade some comments to doc comments

Fix typo in Iterator::size_hint example comment

Annotate the license exceptions

…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.

Remove unused macros from the codebase

Thanks to the lint I've implemented in rust-lang#41907 I've found some unused macros inside the rustc codebase.

…Simulacrum

Add tidy check to detect empty files

Addresses rust-lang#18439.

config.toml.example: point out that optimize = false won't speed up a full bootstrap

Originally I've learned about this by @eddyb pointing this out to me over IRC, and after having told someone today the same over IRC I've thought that this is a common mistake and should be prevented by a note in config.toml.example

r? @eddyb

Fix unexpected panic with the -Z treat-err-as-bug option

This fix an issue where the compiler panics even if there is no error when passed with the `-Z treat-err-as-bug` option.

Fixes rust-lang#35886.

r? @Mark-Simulacrum

…chton

bootstrap: openssl android support

rustdoc: Break words in the location box of the sidebar.

This prevents long names from overflowing.

Before:
![before](https://img.bananium.fr/eijebong/afcfe18b-393e-4d3b-bc11-fe3def6659b9.png)

After:
![after](https://img.bananium.fr/eijebong/9483466b-3b6c-4509-ab0f-fd0c6572ef27.png)