Rollup of 4 pull requests

[Centril]

Successful merges:

• Stabilise weak_ptr_eq #61797 (Stabilise weak_ptr_eq)
• Provide a span if main function is not present in crate #64290 (Provide a span if main function is not present in crate)
• Ban non-extern rust intrinsics #64406 (Ban non-extern rust intrinsics)
• Deduplicate some code between miri and const prop #64419 (Deduplicate some code between miri and const prop)

Failed merges:

r? @ghost

[Centril]

@bors r+ p=4 rollup=never

[bors]

📌 Commit 8e00329 has been approved by Centril

[bors]

⌛ Testing commit 8e00329 with merge 3a7c257b532dd7da2b1917ab1a8ba277f5e7b33d...

[bors]

💔 Test failed - checks-azure

[rust-highfive]

The job dist-various-2 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.

2019-09-14T20:10:05.8916789Z [RUSTC-TIMING] backtrace test:false 0.368
2019-09-14T20:10:06.5521263Z [RUSTC-TIMING] hashbrown test:false 0.858
2019-09-14T20:10:07.4785886Z warning: dropping unsupported crate type `dylib` for target `wasm32-unknown-unknown`
2019-09-14T20:10:07.4791372Z 
2019-09-14T20:10:11.5515776Z thread 'rustc' panicked at 'Tried to access field 1 of union with 0 fields', src/librustc_mir/interpret/place.rs:386:17
2019-09-14T20:10:11.6092847Z 
2019-09-14T20:10:11.6093099Z error: internal compiler error: unexpected panic
2019-09-14T20:10:11.6093147Z 
2019-09-14T20:10:11.6093206Z note: the compiler unexpectedly panicked. this is a bug.
2019-09-14T20:10:11.6093206Z note: the compiler unexpectedly panicked. this is a bug.
2019-09-14T20:10:11.6093270Z 
2019-09-14T20:10:11.6094659Z note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
2019-09-14T20:10:11.6094762Z 
2019-09-14T20:10:11.6095130Z note: rustc 1.39.0-nightly (3a7c257b5 2019-09-14) running on x86_64-unknown-linux-gnu
2019-09-14T20:10:11.6095210Z 
2019-09-14T20:10:11.6095771Z note: compiler flags: -Z binary-dep-depinfo -Z external-macro-backtrace -Z save-analysis -Z force-unstable-if-unmarked -C prefer-dynamic -C opt-level=2 -C debuginfo=1 -C prefer-dynamic -C debug-assertions=n -C codegen-units=1 --crate-type dylib --crate-type rlib
2019-09-14T20:10:11.6095983Z note: some of the compiler flags provided by cargo are hidden
2019-09-14T20:10:11.6096034Z 
2019-09-14T20:10:11.6121728Z [RUSTC-TIMING] std test:false 5.056
2019-09-14T20:10:11.6178912Z error: Could not compile `std`.
2019-09-14T20:10:11.6178912Z error: Could not compile `std`.
2019-09-14T20:10:11.6179009Z 
2019-09-14T20:10:11.6179276Z To learn more, run the command again with --verbose.
2019-09-14T20:10:11.6209763Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "build" "--target" "wasm32-unknown-unknown" "-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"
2019-09-14T20:10:11.6223839Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap dist --target x86_64-fuchsia,aarch64-fuchsia,wasm32-unknown-unknown,wasm32-wasi,sparcv9-sun-solaris,x86_64-sun-solaris,x86_64-unknown-linux-gnux32,x86_64-unknown-cloudabi,x86_64-fortanix-unknown-sgx,nvptx64-nvidia-cuda,armv7-unknown-linux-gnueabi,armv7-unknown-linux-musleabi
2019-09-14T20:10:11.6224116Z Build completed unsuccessfully in 1:03:34
2019-09-14T20:10:11.6286106Z == clock drift check ==
2019-09-14T20:10:11.6304294Z   local time: Sat Sep 14 20:10:11 UTC 2019
2019-09-14T20:10:11.6304294Z   local time: Sat Sep 14 20:10:11 UTC 2019
2019-09-14T20:10:11.6538957Z   network time: Sat, 14 Sep 2019 20:10:11 GMT
2019-09-14T20:10:11.6543938Z == end clock drift check ==
2019-09-14T20:10:13.1921979Z ##[error]Bash exited with code '1'.
2019-09-14T20:10:13.1961136Z ##[section]Starting: Upload CPU usage statistics
2019-09-14T20:10:13.1971835Z ==============================================================================
2019-09-14T20:10:13.1971944Z Task         : Bash
2019-09-14T20:10:13.1972007Z Description  : Run a Bash script on macOS, Linux, or Windows

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