[INFO] updating cached repository jrobar/Twelve-Days-of-Christmas
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jrobar/Twelve-Days-of-Christmas
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jrobar/Twelve-Days-of-Christmas" "work/ex/beta-1.38-1/sources/1.37.0/gh/jrobar/Twelve-Days-of-Christmas"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jrobar/Twelve-Days-of-Christmas'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jrobar/Twelve-Days-of-Christmas" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jrobar/Twelve-Days-of-Christmas"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jrobar/Twelve-Days-of-Christmas'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9eaea4e97773c240c88e7ca49f39fc8573bdf9bd
[INFO] sha for GitHub repo jrobar/Twelve-Days-of-Christmas: 9eaea4e97773c240c88e7ca49f39fc8573bdf9bd
[INFO] validating manifest of jrobar/Twelve-Days-of-Christmas 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 jrobar/Twelve-Days-of-Christmas 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 jrobar/Twelve-Days-of-Christmas
[INFO] finished frobbing jrobar/Twelve-Days-of-Christmas
[INFO] frobbed toml for jrobar/Twelve-Days-of-Christmas written to work/ex/beta-1.38-1/sources/1.37.0/gh/jrobar/Twelve-Days-of-Christmas/Cargo.toml
[INFO] started frobbing jrobar/Twelve-Days-of-Christmas
[INFO] finished frobbing jrobar/Twelve-Days-of-Christmas
[INFO] frobbed toml for jrobar/Twelve-Days-of-Christmas written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jrobar/Twelve-Days-of-Christmas/Cargo.toml
[INFO] crate jrobar/Twelve-Days-of-Christmas 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 jrobar/Twelve-Days-of-Christmas 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jrobar/Twelve-Days-of-Christmas:/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] 70fa47ff0220f7cfc9d61ebdc825cb140dc5e8bbf088903a84f139124915db18
[INFO] running `"docker" "start" "-a" "70fa47ff0220f7cfc9d61ebdc825cb140dc5e8bbf088903a84f139124915db18"`
[INFO] [stderr]    Compiling twelve_days_of_christmas v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let mut n = 11;
[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 0.55s
[INFO] running `"docker" "inspect" "70fa47ff0220f7cfc9d61ebdc825cb140dc5e8bbf088903a84f139124915db18"`
[INFO] running `"docker" "rm" "-f" "70fa47ff0220f7cfc9d61ebdc825cb140dc5e8bbf088903a84f139124915db18"`
[INFO] [stdout] 70fa47ff0220f7cfc9d61ebdc825cb140dc5e8bbf088903a84f139124915db18
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jrobar/Twelve-Days-of-Christmas:/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] 7202309f6316018084504755317a840fb2db5a68b2131dde6d5782ef9ecb252d
[INFO] running `"docker" "start" "-a" "7202309f6316018084504755317a840fb2db5a68b2131dde6d5782ef9ecb252d"`
[INFO] [stderr]    Compiling twelve_days_of_christmas v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let mut n = 11;
[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 0.50s
[INFO] running `"docker" "inspect" "7202309f6316018084504755317a840fb2db5a68b2131dde6d5782ef9ecb252d"`
[INFO] running `"docker" "rm" "-f" "7202309f6316018084504755317a840fb2db5a68b2131dde6d5782ef9ecb252d"`
[INFO] [stdout] 7202309f6316018084504755317a840fb2db5a68b2131dde6d5782ef9ecb252d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jrobar/Twelve-Days-of-Christmas:/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] 8cb968329351ca54e170769452d6f7d8a21f815e5858e5975a784fa993684fec
[INFO] running `"docker" "start" "-a" "8cb968329351ca54e170769452d6f7d8a21f815e5858e5975a784fa993684fec"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/twelve_days_of_christmas-384d100ebf1f943e
[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" "8cb968329351ca54e170769452d6f7d8a21f815e5858e5975a784fa993684fec"`
[INFO] running `"docker" "rm" "-f" "8cb968329351ca54e170769452d6f7d8a21f815e5858e5975a784fa993684fec"`
[INFO] [stdout] 8cb968329351ca54e170769452d6f7d8a21f815e5858e5975a784fa993684fec