Rollup of 4 pull requests

[Centril]

Successful merges:

• Stabilize proc macros generating macro_rules items #64035 (Stabilize proc macros generating macro_rules items)
• syntax: misc extractions #65376 (syntax: misc extractions)
• Optimize BitIter #65425 (Optimize BitIter)
• Refactor: Rename db locals to diag #65428 (Refactor: Rename db locals to diag)

Failed merges:

r? @ghost

[Centril]

Fixed the conflict between #64035 and #65376 manually in b53e6d5.

@bors r+ p=4 rollup=never

[bors]

📌 Commit b53e6d5 has been approved by Centril

[bors]

⌛ Testing commit b53e6d5 with merge 28e7fff780d3af64337aad61c36aace798d26f76...

[bors]

💔 Test failed - checks-azure

[rust-highfive]

The job x86_64-gnu-aux 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.

2019-10-15T11:21:05.7728811Z    Compiling cc v1.0.35
2019-10-15T11:21:05.7729545Z    Compiling core v0.0.0 (/checkout/src/libcore)
2019-10-15T11:21:11.6793778Z [RUSTC-TIMING] cc test:false 5.909
2019-10-15T11:21:11.6836279Z    Compiling build_helper v0.1.0 (/checkout/src/build_helper)
2019-10-15T11:21:12.6246943Z thread 'rustc' panicked at 'attempt to add with overflow', /checkout/src/librustc_index/bit_set.rs:337:13
2019-10-15T11:21:12.6248022Z 
2019-10-15T11:21:12.6248090Z error: internal compiler error: unexpected panic
2019-10-15T11:21:12.6248170Z 
2019-10-15T11:21:12.6248237Z note: the compiler unexpectedly panicked. this is a bug.
2019-10-15T11:21:12.6248237Z note: the compiler unexpectedly panicked. this is a bug.
2019-10-15T11:21:12.6248286Z 
2019-10-15T11:21:12.6249307Z note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
2019-10-15T11:21:12.6249395Z 
2019-10-15T11:21:12.6249720Z note: rustc 1.40.0-dev running on x86_64-unknown-linux-gnu
2019-10-15T11:21:12.6249776Z 
2019-10-15T11:21:12.6250283Z note: compiler flags: -Z external-macro-backtrace -Z binary-dep-depinfo -Z force-unstable-if-unmarked -C opt-level=2 -C codegen-units=1 -C debuginfo=0 -C link-args=-Wl,-rpath,$ORIGIN/../lib -C prefer-dynamic -C debug-assertions=y --crate-type lib
2019-10-15T11:21:12.6250508Z note: some of the compiler flags provided by cargo are hidden
2019-10-15T11:21:12.6250562Z 
2019-10-15T11:21:12.6250816Z [RUSTC-TIMING] core test:false 6.849
2019-10-15T11:21:12.6251088Z error: could not compile `core`.
2019-10-15T11:21:12.6251088Z error: could not compile `core`.
2019-10-15T11:21:12.6251426Z warning: build failed, waiting for other jobs to finish...
2019-10-15T11:21:12.7618681Z [RUSTC-TIMING] build_helper test:false 1.074
2019-10-15T11:21:12.7674613Z error: build failed
2019-10-15T11:21:12.7697371Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "build" "-Zconfig-profile" "--target" "x86_64-unknown-linux-gnu" "-Zbinary-dep-depinfo" "-j" "2" "--release" "--locked" "--color" "always" "--features" "panic-unwind backtrace compiler-builtins-c" "--manifest-path" "/checkout/src/libtest/Cargo.toml" "--message-format" "json-render-diagnostics"
2019-10-15T11:21:12.7697756Z expected success, got: exit code: 101
2019-10-15T11:21:12.7713271Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/test/run-fail/pretty src/test/run-pass-valgrind/pretty src/tools/cargo src/tools/cargotest
2019-10-15T11:21:12.7713416Z Build completed unsuccessfully in 0:32:59
2019-10-15T11:21:12.7760918Z make: *** [check-aux] Error 1
2019-10-15T11:21:12.7761225Z Makefile:50: recipe for target 'check-aux' failed
2019-10-15T11:21:12.7788249Z   local time: Tue Oct 15 11:21:12 UTC 2019
2019-10-15T11:21:12.9280513Z   network time: Tue, 15 Oct 2019 11:21:12 GMT
2019-10-15T11:21:12.9282568Z == end clock drift check ==
2019-10-15T11:21:12.9282568Z == end clock drift check ==
2019-10-15T11:21:16.2064429Z ##[error]Bash exited with code '2'.
2019-10-15T11:21:16.2110018Z ##[section]Starting: Upload CPU usage statistics
2019-10-15T11:21:16.2122303Z ==============================================================================
2019-10-15T11:21:16.2122582Z Task         : Bash
2019-10-15T11:21:16.2122817Z Description  : Run a Bash script on macOS, Linux, or Windows

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