[INFO] updating cached repository NonlinearFruit/number_guessing
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/NonlinearFruit/number_guessing
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/NonlinearFruit/number_guessing" "work/ex/beta-1.37-6/sources/1.36.0/gh/NonlinearFruit/number_guessing"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/NonlinearFruit/number_guessing'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/NonlinearFruit/number_guessing" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/NonlinearFruit/number_guessing"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/NonlinearFruit/number_guessing'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] bfb601b3f7ef11a0ba1f304b4a5b292b212d25c5
[INFO] sha for GitHub repo NonlinearFruit/number_guessing: bfb601b3f7ef11a0ba1f304b4a5b292b212d25c5
[INFO] validating manifest of NonlinearFruit/number_guessing 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 NonlinearFruit/number_guessing 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 NonlinearFruit/number_guessing
[INFO] finished frobbing NonlinearFruit/number_guessing
[INFO] frobbed toml for NonlinearFruit/number_guessing written to work/ex/beta-1.37-6/sources/1.36.0/gh/NonlinearFruit/number_guessing/Cargo.toml
[INFO] started frobbing NonlinearFruit/number_guessing
[INFO] finished frobbing NonlinearFruit/number_guessing
[INFO] frobbed toml for NonlinearFruit/number_guessing written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/NonlinearFruit/number_guessing/Cargo.toml
[INFO] crate NonlinearFruit/number_guessing already has a lockfile, it will not be regenerated
[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 NonlinearFruit/number_guessing 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-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/NonlinearFruit/number_guessing:/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] 4df62241152eb10a706a671d19aa1ec531ca624d6143e02e1960c76a148e727d
[INFO] running `"docker" "start" "-a" "4df62241152eb10a706a671d19aa1ec531ca624d6143e02e1960c76a148e727d"`
[INFO] [stderr]    Compiling guessing_cargo v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let mut guess_count = 8;
[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 1.34s
[INFO] running `"docker" "inspect" "4df62241152eb10a706a671d19aa1ec531ca624d6143e02e1960c76a148e727d"`
[INFO] running `"docker" "rm" "-f" "4df62241152eb10a706a671d19aa1ec531ca624d6143e02e1960c76a148e727d"`
[INFO] [stdout] 4df62241152eb10a706a671d19aa1ec531ca624d6143e02e1960c76a148e727d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/NonlinearFruit/number_guessing:/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] 97abef958650b780ed039ab8cd6a7e4ea7f3390a6c85e2000dd65d75e4fda0c8
[INFO] running `"docker" "start" "-a" "97abef958650b780ed039ab8cd6a7e4ea7f3390a6c85e2000dd65d75e4fda0c8"`
[INFO] [stderr]    Compiling guessing_cargo v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let mut guess_count = 8;
[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 0.80s
[INFO] running `"docker" "inspect" "97abef958650b780ed039ab8cd6a7e4ea7f3390a6c85e2000dd65d75e4fda0c8"`
[INFO] running `"docker" "rm" "-f" "97abef958650b780ed039ab8cd6a7e4ea7f3390a6c85e2000dd65d75e4fda0c8"`
[INFO] [stdout] 97abef958650b780ed039ab8cd6a7e4ea7f3390a6c85e2000dd65d75e4fda0c8
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/NonlinearFruit/number_guessing:/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] ce191d768bdf38d5b79626dfb3195307682c80d3c5eb495b8ebba8a7fa433293
[INFO] running `"docker" "start" "-a" "ce191d768bdf38d5b79626dfb3195307682c80d3c5eb495b8ebba8a7fa433293"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/guessing_cargo-f8331273e6f146b9
[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" "ce191d768bdf38d5b79626dfb3195307682c80d3c5eb495b8ebba8a7fa433293"`
[INFO] running `"docker" "rm" "-f" "ce191d768bdf38d5b79626dfb3195307682c80d3c5eb495b8ebba8a7fa433293"`
[INFO] [stdout] ce191d768bdf38d5b79626dfb3195307682c80d3c5eb495b8ebba8a7fa433293