…loses rust-lang#36122

When parsing as emplacement syntax (`x<-1`), suggest the correct syntax
for comparison against a negative value (`x< -1`).

Allows for example `os_string == "something"`

Fixes rust-lang#51874.

closes rust-lang#51341

`$crate` is not resolved at def-site of a macro, but rather at "transitive def-site"

…onSapin

Implement PartialEq between &str and OsString

This fixes rust-lang#49854.

It allows equality comparison between `OsString` values and `str` references, such as `os_string == "something"`.

hygiene: Implement transparent marks and use them for call-site hygiene in proc-macros

Fixes rust-lang#50050

…xcrichton

Do not allow LLVM to increase a TLS's alignment on macOS.

This addresses the various TLS segfault on macOS 10.10.

Fix rust-lang#51794.
Fix rust-lang#51758.
Fix rust-lang#50867.
Fix rust-lang#48866.
Fix rust-lang#46355.
Fix rust-lang#44056.

…mertj

Fix some doc links

The futures crate CI always fails because of these intra doc links. I hope that this will fix this issue.

r? @steveklabnik
@cramertj

Edit: I added @steveklabnik as reviewer because this PR also adjusts a link in `src/libstd/error.rs`

…akis

Point to lifetime spans on lifetime errors

Update liblibc

This updates the libc submodule

Require type is sized in wfcheck.check_item_type for externed DSTs, c…

…loses rust-lang#36122

Continuing rust-lang#50126.

…rkor

Suggest correct comparison against negative literal

When parsing as emplacement syntax (`x<-1`), suggest the correct syntax
for comparison against a negative value (`x< -1`).

Fix rust-lang#45651.

Fix inconsequential typo in GlobalAlloc doc example

…estebank

use literal span for concrete type suggestion

Fixes rust-lang#51874.

r? @estebank

improve the error message when `#[panic_implementation]` is missing

closes rust-lang#51341

r? @nagisa
cc @phil-opp