[INFO] updating cached repository fuszenecker/TaskStats
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/fuszenecker/TaskStats
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/fuszenecker/TaskStats" "work/ex/beta-1.38-1/sources/1.37.0/gh/fuszenecker/TaskStats"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/fuszenecker/TaskStats'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/fuszenecker/TaskStats" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/fuszenecker/TaskStats"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/fuszenecker/TaskStats'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a8754d3be473dd91b44772fb7dbec73dc7c69a77
[INFO] sha for GitHub repo fuszenecker/TaskStats: a8754d3be473dd91b44772fb7dbec73dc7c69a77
[INFO] validating manifest of fuszenecker/TaskStats 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 fuszenecker/TaskStats 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 fuszenecker/TaskStats
[INFO] finished frobbing fuszenecker/TaskStats
[INFO] frobbed toml for fuszenecker/TaskStats written to work/ex/beta-1.38-1/sources/1.37.0/gh/fuszenecker/TaskStats/Cargo.toml
[INFO] started frobbing fuszenecker/TaskStats
[INFO] finished frobbing fuszenecker/TaskStats
[INFO] frobbed toml for fuszenecker/TaskStats written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/fuszenecker/TaskStats/Cargo.toml
[INFO] crate fuszenecker/TaskStats 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 fuszenecker/TaskStats 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-6/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/fuszenecker/TaskStats:/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] 254f1d848bc14ce8f6f0473dfaa9d93cdbdebf00c0b854d1a6704743e949dd42
[INFO] running `"docker" "start" "-a" "254f1d848bc14ce8f6f0473dfaa9d93cdbdebf00c0b854d1a6704743e949dd42"`
[INFO] [stderr]    Compiling cc v1.0.7
[INFO] [stderr]    Compiling regex v0.2.9
[INFO] [stderr]    Compiling termcolor v0.3.5
[INFO] [stderr]    Compiling termios v0.2.2
[INFO] [stderr]    Compiling clicolors-control v0.2.0
[INFO] [stderr]    Compiling num-integer v0.1.36
[INFO] [stderr]    Compiling serde_json v1.0.11
[INFO] [stderr]    Compiling itertools v0.7.7
[INFO] [stderr]    Compiling parking_lot_core v0.2.13
[INFO] [stderr]    Compiling num-iter v0.1.35
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling chrono v0.4.0
[INFO] [stderr]    Compiling parking_lot v0.5.4
[INFO] [stderr]    Compiling openssl-sys v0.9.27
[INFO] [stderr]    Compiling openssl v0.9.24
[INFO] [stderr]    Compiling console v0.6.1
[INFO] [stderr]    Compiling env_logger v0.5.5
[INFO] [stderr]    Compiling native-tls v0.1.5
[INFO] [stderr]    Compiling tokio-tls v0.1.4
[INFO] [stderr]    Compiling hyper-tls v0.1.2
[INFO] [stderr]    Compiling restson v0.1.3
[INFO] [stderr]    Compiling taskstats v1.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/statistics.rs:53:13
[INFO] [stderr]    |
[INFO] [stderr] 53 |         let mut monthly_vec = monthly.get_mut(&group).unwrap();
[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 50.77s
[INFO] running `"docker" "inspect" "254f1d848bc14ce8f6f0473dfaa9d93cdbdebf00c0b854d1a6704743e949dd42"`
[INFO] running `"docker" "rm" "-f" "254f1d848bc14ce8f6f0473dfaa9d93cdbdebf00c0b854d1a6704743e949dd42"`
[INFO] [stdout] 254f1d848bc14ce8f6f0473dfaa9d93cdbdebf00c0b854d1a6704743e949dd42
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/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/fuszenecker/TaskStats:/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] 07e6491844dc8d6af3271fea1197d47ceec7927ed7e65042037615475a40d6be
[INFO] running `"docker" "start" "-a" "07e6491844dc8d6af3271fea1197d47ceec7927ed7e65042037615475a40d6be"`
[INFO] [stderr]    Compiling taskstats v1.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/statistics.rs:53:13
[INFO] [stderr]    |
[INFO] [stderr] 53 |         let mut monthly_vec = monthly.get_mut(&group).unwrap();
[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 2.68s
[INFO] running `"docker" "inspect" "07e6491844dc8d6af3271fea1197d47ceec7927ed7e65042037615475a40d6be"`
[INFO] running `"docker" "rm" "-f" "07e6491844dc8d6af3271fea1197d47ceec7927ed7e65042037615475a40d6be"`
[INFO] [stdout] 07e6491844dc8d6af3271fea1197d47ceec7927ed7e65042037615475a40d6be
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/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/fuszenecker/TaskStats:/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] 43e4dded19f1c322b027a017920700053ab3a609a3f7b218d1534167756e4a9e
[INFO] running `"docker" "start" "-a" "43e4dded19f1c322b027a017920700053ab3a609a3f7b218d1534167756e4a9e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.13s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/taskstats-c8c314dbce79e0fa
[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" "43e4dded19f1c322b027a017920700053ab3a609a3f7b218d1534167756e4a9e"`
[INFO] running `"docker" "rm" "-f" "43e4dded19f1c322b027a017920700053ab3a609a3f7b218d1534167756e4a9e"`
[INFO] [stdout] 43e4dded19f1c322b027a017920700053ab3a609a3f7b218d1534167756e4a9e