[INFO] crate cgroups-fs 1.0.3 is already in cache
[INFO] extracting crate cgroups-fs 1.0.3 into work/ex/beta-1.37-6/sources/1.36.0/reg/cgroups-fs/1.0.3
[INFO] extracting crate cgroups-fs 1.0.3 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/cgroups-fs/1.0.3
[INFO] validating manifest of cgroups-fs-1.0.3 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of cgroups-fs-1.0.3 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing cgroups-fs-1.0.3
[INFO] finished frobbing cgroups-fs-1.0.3
[INFO] frobbed toml for cgroups-fs-1.0.3 written to work/ex/beta-1.37-6/sources/1.36.0/reg/cgroups-fs/1.0.3/Cargo.toml
[INFO] started frobbing cgroups-fs-1.0.3
[INFO] finished frobbing cgroups-fs-1.0.3
[INFO] frobbed toml for cgroups-fs-1.0.3 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/cgroups-fs/1.0.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing cgroups-fs-1.0.3 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/cgroups-fs/1.0.3:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] dd9a179b69e2dacd88b1e8e44ed6c78a9b65ff6f2165a7f6729e27429e1bc0c1
[INFO] running `"docker" "start" "-a" "dd9a179b69e2dacd88b1e8e44ed6c78a9b65ff6f2165a7f6729e27429e1bc0c1"`
[INFO] [stderr]    Compiling nix v0.13.1
[INFO] [stderr]    Compiling cgroups-fs v1.0.3 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_ok` that must be used
[INFO] [stderr]    --> src/lib.rs:278:13
[INFO] [stderr]     |
[INFO] [stderr] 278 |             inner.remove().is_ok();
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.06s
[INFO] running `"docker" "inspect" "dd9a179b69e2dacd88b1e8e44ed6c78a9b65ff6f2165a7f6729e27429e1bc0c1"`
[INFO] running `"docker" "rm" "-f" "dd9a179b69e2dacd88b1e8e44ed6c78a9b65ff6f2165a7f6729e27429e1bc0c1"`
[INFO] [stdout] dd9a179b69e2dacd88b1e8e44ed6c78a9b65ff6f2165a7f6729e27429e1bc0c1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/cgroups-fs/1.0.3:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 3f50b6e0c75396060f519165a170641276cfbebe0acd59e91dfb7b0d378f25db
[INFO] running `"docker" "start" "-a" "3f50b6e0c75396060f519165a170641276cfbebe0acd59e91dfb7b0d378f25db"`
[INFO] [stderr]    Compiling cgroups-fs v1.0.3 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_ok` that must be used
[INFO] [stderr]    --> src/lib.rs:278:13
[INFO] [stderr]     |
[INFO] [stderr] 278 |             inner.remove().is_ok();
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `"docker" "inspect" "3f50b6e0c75396060f519165a170641276cfbebe0acd59e91dfb7b0d378f25db"`
[INFO] running `"docker" "rm" "-f" "3f50b6e0c75396060f519165a170641276cfbebe0acd59e91dfb7b0d378f25db"`
[INFO] [stdout] 3f50b6e0c75396060f519165a170641276cfbebe0acd59e91dfb7b0d378f25db
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/cgroups-fs/1.0.3:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 2a1e6ab56fe95393c928da4ffd20909e7a9c4b0fd8aae55394edb6034dea6479
[INFO] running `"docker" "start" "-a" "2a1e6ab56fe95393c928da4ffd20909e7a9c4b0fd8aae55394edb6034dea6479"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/cgroups_fs-1a0443aafbabeae6
[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] [stderr]    Doc-tests cgroups-fs
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs - std::process::Command::cgroups (line 316) ... ok
[INFO] [stdout] test src/lib.rs -  (line 8) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "2a1e6ab56fe95393c928da4ffd20909e7a9c4b0fd8aae55394edb6034dea6479"`
[INFO] running `"docker" "rm" "-f" "2a1e6ab56fe95393c928da4ffd20909e7a9c4b0fd8aae55394edb6034dea6479"`
[INFO] [stdout] 2a1e6ab56fe95393c928da4ffd20909e7a9c4b0fd8aae55394edb6034dea6479