[INFO] updating cached repository FreeMasen/log_maintenance
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/FreeMasen/log_maintenance
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/FreeMasen/log_maintenance" "work/ex/beta-1.38-1/sources/1.37.0/gh/FreeMasen/log_maintenance"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/FreeMasen/log_maintenance'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/FreeMasen/log_maintenance" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FreeMasen/log_maintenance"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FreeMasen/log_maintenance'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 523162bc4d06f4d803833a052a086456a93f4ff4
[INFO] sha for GitHub repo FreeMasen/log_maintenance: 523162bc4d06f4d803833a052a086456a93f4ff4
[INFO] validating manifest of FreeMasen/log_maintenance 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 FreeMasen/log_maintenance 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 FreeMasen/log_maintenance
[INFO] finished frobbing FreeMasen/log_maintenance
[INFO] frobbed toml for FreeMasen/log_maintenance written to work/ex/beta-1.38-1/sources/1.37.0/gh/FreeMasen/log_maintenance/Cargo.toml
[INFO] started frobbing FreeMasen/log_maintenance
[INFO] finished frobbing FreeMasen/log_maintenance
[INFO] frobbed toml for FreeMasen/log_maintenance written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FreeMasen/log_maintenance/Cargo.toml
[INFO] crate FreeMasen/log_maintenance 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 FreeMasen/log_maintenance against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FreeMasen/log_maintenance:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] c8c1cdd2b7d34210a96db027108b3900c66698d4fcdfc77d0552eaca62558861
[INFO] running `"docker" "start" "-a" "c8c1cdd2b7d34210a96db027108b3900c66698d4fcdfc77d0552eaca62558861"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.19
[INFO] [stderr]    Compiling serde v1.0.79
[INFO] [stderr]    Compiling same-file v1.0.3
[INFO] [stderr]    Compiling dirs v1.0.4
[INFO] [stderr]    Compiling walkdir v2.2.7
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling syn v0.15.4
[INFO] [stderr]    Compiling serde_derive v1.0.79
[INFO] [stderr]    Compiling toml v0.4.6
[INFO] [stderr]    Compiling log_maintenance v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:39:16
[INFO] [stderr]    |
[INFO] [stderr] 39 |     for (name, mut log) in files.iter_mut() {
[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]     Finished dev [unoptimized + debuginfo] target(s) in 47.65s
[INFO] running `"docker" "inspect" "c8c1cdd2b7d34210a96db027108b3900c66698d4fcdfc77d0552eaca62558861"`
[INFO] running `"docker" "rm" "-f" "c8c1cdd2b7d34210a96db027108b3900c66698d4fcdfc77d0552eaca62558861"`
[INFO] [stdout] c8c1cdd2b7d34210a96db027108b3900c66698d4fcdfc77d0552eaca62558861
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FreeMasen/log_maintenance:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 2a357d254748ce746e64faadc9a2922eb80ed6905e6cf95ee77c622d8b4cd72a
[INFO] running `"docker" "start" "-a" "2a357d254748ce746e64faadc9a2922eb80ed6905e6cf95ee77c622d8b4cd72a"`
[INFO] [stderr]    Compiling log_maintenance v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:39:16
[INFO] [stderr]    |
[INFO] [stderr] 39 |     for (name, mut log) in files.iter_mut() {
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1.08s
[INFO] running `"docker" "inspect" "2a357d254748ce746e64faadc9a2922eb80ed6905e6cf95ee77c622d8b4cd72a"`
[INFO] running `"docker" "rm" "-f" "2a357d254748ce746e64faadc9a2922eb80ed6905e6cf95ee77c622d8b4cd72a"`
[INFO] [stdout] 2a357d254748ce746e64faadc9a2922eb80ed6905e6cf95ee77c622d8b4cd72a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FreeMasen/log_maintenance:/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] af18e60c47d6a39bc1c949ae5fee2ae74398a026106090ac156c29799e66e8f1
[INFO] running `"docker" "start" "-a" "af18e60c47d6a39bc1c949ae5fee2ae74398a026106090ac156c29799e66e8f1"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/log_maintenance-82d218781986e2d3
[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" "af18e60c47d6a39bc1c949ae5fee2ae74398a026106090ac156c29799e66e8f1"`
[INFO] running `"docker" "rm" "-f" "af18e60c47d6a39bc1c949ae5fee2ae74398a026106090ac156c29799e66e8f1"`
[INFO] [stdout] af18e60c47d6a39bc1c949ae5fee2ae74398a026106090ac156c29799e66e8f1