See rust-lang#82379 (comment)

WASI's `filestat` type includes a size field, so expose it in
`MetadataExt` via a `size()` function, similar to the corresponding Unix
function.

This adds API documentation support for `std::os::wasi` modeled after
how `std::os::unix` works, so that WASI can be documented [here] along
with the other platforms.

[here]: https://doc.rust-lang.org/stable/std/os/index.html

Two changes of particular interest:

 - This changes the `AsRawFd` for `io::Stdin` for WASI to return
   `libc::STDIN_FILENO` instead of `sys::stdio::Stdin.as_raw_fd()` (and
   similar for `Stdout` and `Stderr`), which matches how the `unix`
   version works. `STDIN_FILENO` etc. may not always be explicitly
   reserved at the WASI level, but as long as we have Rust's `std` and
   `libc`, I think it's reasonable to guarantee that we'll always use
   `libc::STDIN_FILENO` for stdin.

 - This duplicates the `osstr2str` utility function, rather than
   trying to share it across all the configurations that need it.

Fixes rust-lang#82438

This map is not guarnateed to have an entry for a closure.

Use small hash set in `mir_inliner_callees` to avoid temporary
allocation when possible and quadratic behaviour for large number of
callees.

Co-authored-by: Nathan Nguyen <43092380+nhwn@users.noreply.github.com>

WASI's `RawFd` is a `u32`, while `libc` uses `c_int`.

This ensures that these names resolve to the right place even when
building the WASI support on other platforms for generating the
documentation.

Fix rust-lang#82455.

As suggested by GuillaumeGomez

…sue, r=camelid

update tracking issue for `relaxed_struct_unsize`

forgot to do this before rust-lang#80726 got merged. The tracking issue is rust-lang#81793

…leywiser

Replace const_cstr with cstr crate

This PR replaces the `const_cstr` macro inside `rustc_data_structures` with `cstr` macro from [cstr](https://crates.io/crates/cstr) crate.

The two macros basically serve the same purpose, which is to generate `&'static CStr` from a string literal. `cstr` is better because it validates the literal at compile time, while the existing `const_cstr` does it at runtime when `debug_assertions` is enabled. In addition, the value `cstr` generates can be used in constant context (which is seemingly not needed anywhere currently, though).

…onymous-lifetime, r=estebank

Improve anonymous lifetime note to indicate the target span

Improvement for  rust-lang#81650
Cc rust-lang#81995

Message after this improvement:
(Improve note in the middle)

```
error[E0311]: the parameter type `T` may not live long enough
  --> src/main.rs:25:11
   |
24 | fn play_with<T: Animal + Send>(scope: &Scope, animal: T) {
   |              -- help: consider adding an explicit lifetime bound...: `T: 'a +`
25 |     scope.spawn(move |_| {
   |           ^^^^^
   |
note: the parameter type `T` must be valid for the anonymous lifetime defined on the function body at 24:40...
  --> src/main.rs:24:40
   |
24 | fn play_with<T: Animal + Send>(scope: &Scope, animal: T) {
   |                                        ^^^^^
note: ...so that the type `[closure@src/main.rs:25:17: 27:6]` will meet its required lifetime bounds
  --> src/main.rs:25:11
   |
25 |     scope.spawn(move |_| {
   |           ^^^^^
```

r? ``````@estebank``````

…=jonas-schievink

⬆️ rust-analyzer

Add Future trait for doc_spotlight feature doc

…mps, r=petrochenkov

Test hexagon-enum only when llvm target is present

See rust-lang#82379 (comment)

r? ``````@petrochenkov``````

``````@bors`````` rollup

expand: Preserve order of inert attributes during expansion

Fixes rust-lang#67839
Fixes rust-lang#81871
r? `````@Aaron1011`````

Enable API documentation for `std::os::wasi`.

This adds API documentation support for `std::os::wasi` modeled after
how `std::os::unix` works, so that WASI can be documented [here] along
with the other platforms.

[here]: https://doc.rust-lang.org/stable/std/os/index.html

Two changes of particular interest:

 - This changes the `AsRawFd` for `io::Stdin` for WASI to return
   `libc::STDIN_FILENO` instead of `sys::stdio::Stdin.as_raw_fd()` (and
   similar for `Stdout` and `Stderr`), which matches how the `unix`
   version works. `STDIN_FILENO` etc. may not always be explicitly
   reserved at the WASI level, but as long as we have Rust's `std` and
   `libc`, I think it's reasonable to guarantee that we'll always use
   `libc::STDIN_FILENO` for stdin.

 - This duplicates the `osstr2str` utility function, rather than
   trying to share it across all the configurations that need it.

r? ```@alexcrichton```

…lexcrichton

Add a `size()` function to WASI's `MetadataExt`.

WASI's `filestat` type includes a size field, so expose it in
`MetadataExt` via a `size()` function, similar to the corresponding Unix
function.

r? ``````@alexcrichton``````

…matthewjasper

Skip emitting closure diagnostic when closure_kind_origins has no entry

Fixes rust-lang#82438

This map is not guarnateed to have an entry for a closure.

…ou-se

Use libc::accept4 on Android instead of raw syscall.

This PR replaces the use of a raw `accept4` syscall with `libc::accept4`. This was originally added (by me) because `std` couldn't update to the latest `libc` with `accept4` support for android. By now, libc is already on 0.2.85, so the workaround can be removed.

`@rustbot` label +O-android +T-libs-impl

Use small hash set in `mir_inliner_callees`

Use small hash set in `mir_inliner_callees` to avoid temporary
allocation when possible and quadratic behaviour for large number of
callees.

Update cargo

11 commits in bf5a5d5e5d3ae842a63bfce6d070dfd438cf6070..572e201536dc2e4920346e28037b63c0f4d88b3c
2021-02-18 15:49:14 +0000 to 2021-02-24 16:51:20 +0000
- Pass the error message format to rustdoc (rust-lang/cargo#9128)
- Fix test target_in_environment_contains_lower_case (rust-lang/cargo#9203)
- Fix hang on broken stderr. (rust-lang/cargo#9201)
- Make it more clear which module is being tested when running cargo test (rust-lang/cargo#9195)
- Updates to edition handling. (rust-lang/cargo#9184)
- Add --cfg and --rustc-cfg flags to output compiler configuration (rust-lang/cargo#9002)
- Run rustdoc doctests relative to the workspace (rust-lang/cargo#9105)
- Add support for [env] section in .cargo/config.toml (rust-lang/cargo#9175)
- Add schema field and `features2` to the index. (rust-lang/cargo#9161)
- Document the default location where cargo install emitting build artifacts (rust-lang/cargo#9189)
- Do not exit prematurely if anything failed installing. (rust-lang/cargo#9185)

Substitute erased lifetimes on bad placeholder type

Fix rust-lang#82455.