Fix tracking issue for Once::is_completed

[SimonSapin]

#53027 was merged without a tracking issue. I just filed #54890. CC @matklad

[rust-highfive]

r? @shepmaster

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[nagisa]

@bors r+

[bors]

📌 Commit 9a9894a has been approved by nagisa

[bors]

⌛ Testing commit 9a9894a with merge 471ee60ac7bdd821a6af29f715f1d479932deb48...

[bors]

💔 Test failed - status-travis

[rust-highfive]

The job i686-gnu-nopt of your PR failed on Travis (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.

[01:46:26] test sync::mpsc::tests::stress_recv_timeout_two_threads ... ok
[01:46:26] 
[01:46:26] failures:
[01:46:26] 
[01:46:26] ---- net::tcp::tests::connect_timeout_unbound stdout ----
[01:46:26] thread 'net::tcp::tests::connect_timeout_unbound' panicked at 'called `Result::unwrap_err()` on an `Ok` value: TcpStream { addr: V4(127.0.0.1:41268), peer: V4(127.0.0.1:41268), fd: 3 }', libcore/result.rs:1009:5
[01:46:26] 
[01:46:26] failures:
[01:46:26]     net::tcp::tests::connect_timeout_unbound
[01:46:26] 
[01:46:26] 
[01:46:26] test result: FAILED. 768 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out
[01:46:26] 
[01:46:26] error: test failed, to rerun pass '--lib'
[01:46:26] 
[01:46:26] 
[01:46:26] command did not execute successfully: "/checkout/obj/build/i686-unknown-linux-gnu/stage0/bin/cargo" "test" "--target" "i686-unknown-linux-gnu" "-j" "4" "--release" "--locked" "--color" "always" "--features" "panic-unwind jemalloc backtrace" "--manifest-path" "/checkout/src/libstd/Cargo.toml" "-p" "std" "--"
[01:46:26] 
[01:46:26] 
[01:46:26] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[01:46:26] Build completed unsuccessfully in 0:35:01
[01:46:26] Build completed unsuccessfully in 0:35:01
[01:46:26] Makefile:58: recipe for target 'check' failed
[01:46:26] make: *** [check] Error 1

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:040df898
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)
---
travis_time:end:08d9e407:start=1538934963627513755,finish=1538934963637061576,duration=9547821
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:005e2c54
$ ln -s . checkout && for CORE in obj/cores/core.*; do EXE=$(echo $CORE | sed 's|obj/cores/core\.[0-9]*\.!checkout!\(.*\)|\1|;y|!|/|'); if [ -f "$EXE" ]; then printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" "$CORE"; gdb --batch -q -c "$CORE" "$EXE" -iex 'set auto-load off' -iex 'dir src/' -iex 'set sysroot .' -ex bt -ex q; echo travis_fold":"end:crashlog; fi; done || true
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:2245c530
travis_time:start:2245c530
$ cat ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
cat: ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers: No such file or directory
travis_fold:end:after_failure.5
travis_fold:start:after_failure.6
travis_time:start:2d445d2a
$ dmesg | grep -i kill

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[kennytm]

@bors retry rollup