[INFO] crate trailing_cell 0.3.0 is already in cache
[INFO] extracting crate trailing_cell 0.3.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/trailing_cell/0.3.0
[INFO] extracting crate trailing_cell 0.3.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/trailing_cell/0.3.0
[INFO] validating manifest of trailing_cell-0.3.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of trailing_cell-0.3.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing trailing_cell-0.3.0
[INFO] finished frobbing trailing_cell-0.3.0
[INFO] frobbed toml for trailing_cell-0.3.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/trailing_cell/0.3.0/Cargo.toml
[INFO] started frobbing trailing_cell-0.3.0
[INFO] finished frobbing trailing_cell-0.3.0
[INFO] frobbed toml for trailing_cell-0.3.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/trailing_cell/0.3.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing trailing_cell-0.3.0 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/trailing_cell/0.3.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 199d862e7211edecf32190283e48f9863b20148eee5f62d9888108e3b173aa53
[INFO] running `"docker" "start" "-a" "199d862e7211edecf32190283e48f9863b20148eee5f62d9888108e3b173aa53"`
[INFO] [stderr]    Compiling atomic-option v0.1.2
[INFO] [stderr]    Compiling bus v1.4.1
[INFO] [stderr]    Compiling trailing_cell v0.3.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.92s
[INFO] running `"docker" "inspect" "199d862e7211edecf32190283e48f9863b20148eee5f62d9888108e3b173aa53"`
[INFO] running `"docker" "rm" "-f" "199d862e7211edecf32190283e48f9863b20148eee5f62d9888108e3b173aa53"`
[INFO] [stdout] 199d862e7211edecf32190283e48f9863b20148eee5f62d9888108e3b173aa53
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/trailing_cell/0.3.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] a9babbc0734c0b801c25627fa65d469e67b3001f5a23919b9be00b6abae4f74d
[INFO] running `"docker" "start" "-a" "a9babbc0734c0b801c25627fa65d469e67b3001f5a23919b9be00b6abae4f74d"`
[INFO] [stderr]    Compiling trailing_cell v0.3.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_ok` that must be used
[INFO] [stderr]   --> src/tests.rs:77:9
[INFO] [stderr]    |
[INFO] [stderr] 77 |         h.join().is_ok();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_ok` that must be used
[INFO] [stderr]    --> src/tests.rs:103:5
[INFO] [stderr]     |
[INFO] [stderr] 103 |     h1.join().is_ok();
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_ok` that must be used
[INFO] [stderr]    --> src/tests.rs:104:5
[INFO] [stderr]     |
[INFO] [stderr] 104 |     h2.join().is_ok();
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.84s
[INFO] running `"docker" "inspect" "a9babbc0734c0b801c25627fa65d469e67b3001f5a23919b9be00b6abae4f74d"`
[INFO] running `"docker" "rm" "-f" "a9babbc0734c0b801c25627fa65d469e67b3001f5a23919b9be00b6abae4f74d"`
[INFO] [stdout] a9babbc0734c0b801c25627fa65d469e67b3001f5a23919b9be00b6abae4f74d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/trailing_cell/0.3.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 267b9fffe558395a8ff4a7402aa537ec22f203860615bb5a14ff2ee68b181325
[INFO] running `"docker" "start" "-a" "267b9fffe558395a8ff4a7402aa537ec22f203860615bb5a14ff2ee68b181325"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/trailing_cell-5997dfff76e5ff47
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test tests::deref ... ok
[INFO] [stdout] test tests::staleness ... ok
[INFO] [stdout] test tests::deref_mut ... ok
[INFO] [stdout] test tests::wrapping_unwrapping ... ok
[INFO] [stdout] test tests::limited_sync ... ok
[INFO] [stdout] test tests::w1_r1_multithreaded ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests trailing_cell
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "267b9fffe558395a8ff4a7402aa537ec22f203860615bb5a14ff2ee68b181325"`
[INFO] running `"docker" "rm" "-f" "267b9fffe558395a8ff4a7402aa537ec22f203860615bb5a14ff2ee68b181325"`
[INFO] [stdout] 267b9fffe558395a8ff4a7402aa537ec22f203860615bb5a14ff2ee68b181325