…are now exactly the same as that produced by AST borrowck. Bravo!

This reverts commit d6ba1b9, reversing
changes made to 8de5353.

It has no effect on deployment error and may cause further network issues.

Tries to workaround travis-ci/travis-ci#9696.

…derr-files, r=oli-obk

Remove two redundant .nll.stderr files

It turns out that the diagnostics generated from NLL for these cases are now exactly the same as that produced by AST borrowck, and thus we can just fallback on those `.stderr` files that already exist for AST-borrowck.

Bravo!

(it is a good idea to remove these files, because it slightly reduces the amount of time humans will spend reviewing the .nll.stderr fileset...)

((it *might* be worthwhile trying to change the `compiletest` code to even issue a warning when two such files have equivalent contents... but I am not going so far as to try to implement that right now...))

…ng-song-and-dance, r=nikomatsakis

Deny #[cfg] and #[cfg_attr] on generic parameters.

Fix rust-lang#51279.

Attributes on generic parameters are not expanded, meaning `#[cfg]`, `#[cfg_attr]` and attribute proc macros are entirely ignored on them.

This PR makes using the first two attributes an error, because if they are correctly expanded will affect the AST and change code behavior.

I'm beta-nominating this, because generic parameter attributes are stabilizing in 1.27, and if we did not reserve their usage, we may never be able to repurpose the meaning of these attributes in the Rust 2015 edition.

…s, r=eddyb

Fix the use of closures within #[panic_implementation]

Fixes rust-lang#51365.

…r=oli-obk

Remove dependency on fmt_macros from typeck

None

…b, r=QuietMisdreavus

rustdoc: Fix missing stability and src links for inlined external macros

Fixes rust-lang#38951

r? @QuietMisdreavus

NLL performance boost

This makes compilation of the [inflate](https://github.com/rust-lang-nursery/rustc-perf/tree/master/collector/benchmarks/inflate) benchmark compile 2 times faster on my computer when NLL is enabled.
This does not fix the rust-lang#51377 perfectly, it's still 4-5 times slower than without NLL, but it's a start.

Update RLS and Rustfmt

r? @Mark-Simulacrum

Fixes tests

…tsakis

Revert rust-lang#49719

This also needs to be backported into beta.

Fixes rust-lang#51416.
r? @nikomatsakis

…-Simulacrum

Tries to address the recent network issues

1. Set the DNS server to 8.8.8.8/8.8.4.4/1.1.1.1/1.0.0.1 to workaround the daily "Cannot resolve host" error these two weeks.
2. Remove the unnecessary command `gem update --system` (originally added as experiment of the "Could not find a valid gem" error, which turns out to be useless).