Initially landed in rust-lang#48292
and reverted in rust-lang#50401.
This time, use `std::string::ParseError` as suggested in
rust-lang#44431 (comment)

Sometimes it *is* initialized!

Fixes rust-lang#55239

When inlining a function using the Mir inliner, we shouldn't rerun the
various Mir passes on it because the Mir has already been lowered and
that wil break various early Mir passes.

The issue in rust-lang#50411 is that we've inlined a function with promotions
whose Mir has already been lowered. The promotions are then copied into
the local function and we begin to run passes on their lowered Mir
which causes the ICE.

Fixes rust-lang#50411

This can be obtained via the `$mir_phase` value.

As suggested in the feedback for rust-lang#55244.

When I replaced the macro with a function, rustc started complaining
that there were two unused functions so I also removed those.

…lates to rust-lang#49098

remove unused variable i in example String::with_capacity()

This commit extends existing path suggestions to link to documentation
on the changed semantics of `use` in Rust 2018.

https://internals.rust-lang.org/t/mini-rfc-manuallydrop-take/8679

Implement FromStr for PathBuf

Initially landed in rust-lang#48292 and reverted in rust-lang#50401. This time, use `std::string::ParseError` as suggested in rust-lang#44431 (comment)

…uietMisdreavus

Fix sub-variant doc display

Fixes rust-lang#54758.

<img width="1440" alt="screen shot 2018-10-19 at 01 34 11" src="https://user-images.githubusercontent.com/3050060/47189939-43481d00-d33f-11e8-868f-cf479fc79e62.png">

r? @QuietMisdreavus

…akis

Don't rerun MIR passes when inlining

Fixes rust-lang#50411

r? @nikomatsakis

I updated your commit message with additional details. Let me know if any of that is incorrect. I also added the appropriate `compile-flags` directive to the test.

Thanks for you help on this!

cc @RalfJung related to your PR rust-lang#55086

Add MaybeUninit::new

Sometimes it *is* initialized!

Remove unnecessary mut in iterator.find_map documentation example, R…

Relates to rust-lang#49098

Removes a mut that could induce newcomers to put a mut in their code that the compiler would comply about.

https://github.com/rust-lang/rust/pull/49098/files#r227422388

Update string.rs

remove unused variable i in example String::with_capacity()

Fix an ICE in the min_const_fn analysis

fixes rust-lang#55395

cc @Centril

Add ManuallyDrop::take

Tracking issue: rust-lang#55422

Proposed in this form in https://internals.rust-lang.org/t/mini-rfc-manuallydrop-take/8679,
see that thread for some history.

A small convenience wrapper for `ManuallyDrop` that makes a pattern (taking ownership of the contained data in drop) more obvious.

path suggestions in Rust 2018 should point out the change in semantics

Fixes rust-lang#55130.

This commit extends existing path suggestions to link to documentation
on the changed semantics of `use` in Rust 2018.

Allow extern statics with an extern type

Fixes rust-lang#55239

Impl items have generics