[INFO] updating cached repository MaikKlein/false_sharing
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/MaikKlein/false_sharing
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/MaikKlein/false_sharing" "work/ex/beta-1.38-1/sources/1.37.0/gh/MaikKlein/false_sharing"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/MaikKlein/false_sharing'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/MaikKlein/false_sharing" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MaikKlein/false_sharing"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MaikKlein/false_sharing'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ec6e08eca90e211b4121e30608a11836a7536686
[INFO] sha for GitHub repo MaikKlein/false_sharing: ec6e08eca90e211b4121e30608a11836a7536686
[INFO] validating manifest of MaikKlein/false_sharing 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 MaikKlein/false_sharing 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 MaikKlein/false_sharing
[INFO] finished frobbing MaikKlein/false_sharing
[INFO] frobbed toml for MaikKlein/false_sharing written to work/ex/beta-1.38-1/sources/1.37.0/gh/MaikKlein/false_sharing/Cargo.toml
[INFO] started frobbing MaikKlein/false_sharing
[INFO] finished frobbing MaikKlein/false_sharing
[INFO] frobbed toml for MaikKlein/false_sharing written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MaikKlein/false_sharing/Cargo.toml
[INFO] crate MaikKlein/false_sharing already has a lockfile, it will not be regenerated
[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 MaikKlein/false_sharing 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/MaikKlein/false_sharing:/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] 6878105845be569a46ce7fda804dd52e981f4cd73829131b52f4709e3e4ef3fe
[INFO] running `"docker" "start" "-a" "6878105845be569a46ce7fda804dd52e981f4cd73829131b52f4709e3e4ef3fe"`
[INFO] [stderr]    Compiling itertools v0.5.8
[INFO] [stderr]    Compiling false_sharing v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:15:21
[INFO] [stderr]    |
[INFO] [stderr] 15 |                 for mut chunk in v_parallel.chunks_mut(chunk_size) {
[INFO] [stderr]    |                     ----^^^^^
[INFO] [stderr]    |                     |
[INFO] [stderr]    |                     help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:31:17
[INFO] [stderr]    |
[INFO] [stderr] 31 |             for mut chunk in v_seq.chunks_mut(chunk_size) {
[INFO] [stderr]    |                 ----^^^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.93s
[INFO] running `"docker" "inspect" "6878105845be569a46ce7fda804dd52e981f4cd73829131b52f4709e3e4ef3fe"`
[INFO] running `"docker" "rm" "-f" "6878105845be569a46ce7fda804dd52e981f4cd73829131b52f4709e3e4ef3fe"`
[INFO] [stdout] 6878105845be569a46ce7fda804dd52e981f4cd73829131b52f4709e3e4ef3fe
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/MaikKlein/false_sharing:/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] db0ae8d343447d2ef5a8d2629a3f6ffa6e4fd2223352dd08864422e81a2afac2
[INFO] running `"docker" "start" "-a" "db0ae8d343447d2ef5a8d2629a3f6ffa6e4fd2223352dd08864422e81a2afac2"`
[INFO] [stderr]    Compiling false_sharing v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:15:21
[INFO] [stderr]    |
[INFO] [stderr] 15 |                 for mut chunk in v_parallel.chunks_mut(chunk_size) {
[INFO] [stderr]    |                     ----^^^^^
[INFO] [stderr]    |                     |
[INFO] [stderr]    |                     help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:31:17
[INFO] [stderr]    |
[INFO] [stderr] 31 |             for mut chunk in v_seq.chunks_mut(chunk_size) {
[INFO] [stderr]    |                 ----^^^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `"docker" "inspect" "db0ae8d343447d2ef5a8d2629a3f6ffa6e4fd2223352dd08864422e81a2afac2"`
[INFO] running `"docker" "rm" "-f" "db0ae8d343447d2ef5a8d2629a3f6ffa6e4fd2223352dd08864422e81a2afac2"`
[INFO] [stdout] db0ae8d343447d2ef5a8d2629a3f6ffa6e4fd2223352dd08864422e81a2afac2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/MaikKlein/false_sharing:/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] 37b6e69d246712fde6cfc5f3d8a217b257c7c88c0e29dd8fa8daea7f2d9c1eef
[INFO] running `"docker" "start" "-a" "37b6e69d246712fde6cfc5f3d8a217b257c7c88c0e29dd8fa8daea7f2d9c1eef"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/false_sharing-d8786c9e2cf456dd
[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" "37b6e69d246712fde6cfc5f3d8a217b257c7c88c0e29dd8fa8daea7f2d9c1eef"`
[INFO] running `"docker" "rm" "-f" "37b6e69d246712fde6cfc5f3d8a217b257c7c88c0e29dd8fa8daea7f2d9c1eef"`
[INFO] [stdout] 37b6e69d246712fde6cfc5f3d8a217b257c7c88c0e29dd8fa8daea7f2d9c1eef