[INFO] updating cached repository kgost/merge_sort
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kgost/merge_sort
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kgost/merge_sort" "work/ex/beta-1.38-1/sources/1.37.0/gh/kgost/merge_sort"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kgost/merge_sort'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kgost/merge_sort" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kgost/merge_sort"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kgost/merge_sort'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 92ed3dc1c575f3230c5ef3756c2a63e91eb3f2cd
[INFO] sha for GitHub repo kgost/merge_sort: 92ed3dc1c575f3230c5ef3756c2a63e91eb3f2cd
[INFO] validating manifest of kgost/merge_sort 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 kgost/merge_sort 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 kgost/merge_sort
[INFO] finished frobbing kgost/merge_sort
[INFO] frobbed toml for kgost/merge_sort written to work/ex/beta-1.38-1/sources/1.37.0/gh/kgost/merge_sort/Cargo.toml
[INFO] started frobbing kgost/merge_sort
[INFO] finished frobbing kgost/merge_sort
[INFO] frobbed toml for kgost/merge_sort written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kgost/merge_sort/Cargo.toml
[INFO] crate kgost/merge_sort 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 kgost/merge_sort 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kgost/merge_sort:/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] 1663c5696d733333ec2b637c2276d147984e24740b3f85753ca180a343071dcf
[INFO] running `"docker" "start" "-a" "1663c5696d733333ec2b637c2276d147984e24740b3f85753ca180a343071dcf"`
[INFO] [stderr]    Compiling libc v0.2.53
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling num_cpus v0.2.13
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling merge_sort v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/main.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     for i in 0..array_count {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/main.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     for i in 0..array_count {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.07s
[INFO] running `"docker" "inspect" "1663c5696d733333ec2b637c2276d147984e24740b3f85753ca180a343071dcf"`
[INFO] running `"docker" "rm" "-f" "1663c5696d733333ec2b637c2276d147984e24740b3f85753ca180a343071dcf"`
[INFO] [stdout] 1663c5696d733333ec2b637c2276d147984e24740b3f85753ca180a343071dcf
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kgost/merge_sort:/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] d72f22bf770b100c979d856cc5565a6e6819e1e9d2ac779bcdcb38b7bcc9f7bc
[INFO] running `"docker" "start" "-a" "d72f22bf770b100c979d856cc5565a6e6819e1e9d2ac779bcdcb38b7bcc9f7bc"`
[INFO] [stderr]    Compiling merge_sort v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/main.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     for i in 0..array_count {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/main.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     for i in 0..array_count {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.43s
[INFO] running `"docker" "inspect" "d72f22bf770b100c979d856cc5565a6e6819e1e9d2ac779bcdcb38b7bcc9f7bc"`
[INFO] running `"docker" "rm" "-f" "d72f22bf770b100c979d856cc5565a6e6819e1e9d2ac779bcdcb38b7bcc9f7bc"`
[INFO] [stdout] d72f22bf770b100c979d856cc5565a6e6819e1e9d2ac779bcdcb38b7bcc9f7bc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kgost/merge_sort:/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] 44d87d0645f1c72c356d5ead37cfd195b0e0ebc59d2364ba7365f2b43b4b4057
[INFO] running `"docker" "start" "-a" "44d87d0645f1c72c356d5ead37cfd195b0e0ebc59d2364ba7365f2b43b4b4057"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/merge_sort-38a92d95ba06882b
[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" "44d87d0645f1c72c356d5ead37cfd195b0e0ebc59d2364ba7365f2b43b4b4057"`
[INFO] running `"docker" "rm" "-f" "44d87d0645f1c72c356d5ead37cfd195b0e0ebc59d2364ba7365f2b43b4b4057"`
[INFO] [stdout] 44d87d0645f1c72c356d5ead37cfd195b0e0ebc59d2364ba7365f2b43b4b4057