Rollup of 8 pull requests

[Centril]

Successful merges:

• Prefer statx on linux if available #65094 (Prefer statx on linux if available)
• Fix zero-size uninitialized boxes #65174 (Fix zero-size uninitialized boxes)
• InterpCx: make memory field public #65319 (InterpCx: make memory field public)
• Add long error explanation for E0575 #65334 (Add long error explanation for E0575)
• Don't recommend ONCE_INIT in std::sync::Once #65461 (Don't recommend ONCE_INIT in std::sync::Once)
• Move syntax::ext to a syntax_expand and refactor some attribute logic #65465 (Move syntax::ext to a syntax_expand and refactor some attribute logic)
• add example for type_name #65475 (add example for type_name)
• fmt::Write is about string slices, not byte slices #65478 (fmt::Write is about string slices, not byte slices)

Failed merges:

• Add long error explanation for E0576 #65390 (Add long error explanation for E0576)

r? @ghost

[Centril]

@bors r+ p=8 rollup=never

[bors]

📌 Commit 940ae78 has been approved by Centril

[rust-highfive]

The job x86_64-gnu-llvm-6.0 of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

2019-10-16T23:18:09.4264019Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-10-16T23:18:09.4438237Z ##[command]git config gc.auto 0
2019-10-16T23:18:09.4508929Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-10-16T23:18:10.1692244Z ##[command]git config --get-all http.proxy
2019-10-16T23:18:10.1696604Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/65482/merge:refs/remotes/pull/65482/merge
---
2019-10-16T23:25:11.0236940Z    Compiling serde_json v1.0.40
2019-10-16T23:25:12.9318082Z    Compiling tidy v0.1.0 (/checkout/src/tools/tidy)
2019-10-16T23:25:25.0789755Z     Finished release [optimized] target(s) in 1m 34s
2019-10-16T23:25:25.0882079Z tidy check
2019-10-16T23:25:25.2212416Z tidy error: /checkout/src/liballoc/tests/boxed.rs: too many trailing newlines (2)
2019-10-16T23:25:27.1533214Z some tidy checks failed
2019-10-16T23:25:27.1534153Z Found 482 error codes
2019-10-16T23:25:27.1534400Z Found 0 error codes with no tests
2019-10-16T23:25:27.1534642Z Done!
2019-10-16T23:25:27.1534642Z Done!
2019-10-16T23:25:27.1538610Z 
2019-10-16T23:25:27.1538914Z 
2019-10-16T23:25:27.1540455Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/src" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "--no-vendor"
2019-10-16T23:25:27.1541454Z 
2019-10-16T23:25:27.1541661Z 
2019-10-16T23:25:27.1551314Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
2019-10-16T23:25:27.1551744Z Build completed unsuccessfully in 0:01:38
2019-10-16T23:25:27.1551744Z Build completed unsuccessfully in 0:01:38
2019-10-16T23:25:27.1597808Z == clock drift check ==
2019-10-16T23:25:27.1629841Z   local time: Wed Oct 16 23:25:27 UTC 2019
2019-10-16T23:25:27.2643019Z   network time: Wed, 16 Oct 2019 23:25:27 GMT
2019-10-16T23:25:27.2644147Z == end clock drift check ==
2019-10-16T23:25:28.7305622Z ##[error]Bash exited with code '1'.
2019-10-16T23:25:28.7342043Z ##[section]Starting: Checkout
2019-10-16T23:25:28.7343695Z ==============================================================================
2019-10-16T23:25:28.7343769Z Task         : Get sources
2019-10-16T23:25:28.7343836Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

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