[INFO] updating cached repository Regan-Koopmans/n-queens
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Regan-Koopmans/n-queens
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Regan-Koopmans/n-queens" "work/ex/beta-1.38-1/sources/1.37.0/gh/Regan-Koopmans/n-queens"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Regan-Koopmans/n-queens'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Regan-Koopmans/n-queens" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Regan-Koopmans/n-queens"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Regan-Koopmans/n-queens'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] dd566835d4d2dafc2a1ee06490be44c4e502ade3
[INFO] sha for GitHub repo Regan-Koopmans/n-queens: dd566835d4d2dafc2a1ee06490be44c4e502ade3
[INFO] validating manifest of Regan-Koopmans/n-queens 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 Regan-Koopmans/n-queens 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 Regan-Koopmans/n-queens
[INFO] finished frobbing Regan-Koopmans/n-queens
[INFO] frobbed toml for Regan-Koopmans/n-queens written to work/ex/beta-1.38-1/sources/1.37.0/gh/Regan-Koopmans/n-queens/Cargo.toml
[INFO] started frobbing Regan-Koopmans/n-queens
[INFO] finished frobbing Regan-Koopmans/n-queens
[INFO] frobbed toml for Regan-Koopmans/n-queens written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Regan-Koopmans/n-queens/Cargo.toml
[INFO] crate Regan-Koopmans/n-queens 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 Regan-Koopmans/n-queens 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-7/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/Regan-Koopmans/n-queens:/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] 65403713f9d23b8de8dc605b25084823d1096bd4085a81f09f7b55816381c782
[INFO] running `"docker" "start" "-a" "65403713f9d23b8de8dc605b25084823d1096bd4085a81f09f7b55816381c782"`
[INFO] [stderr]    Compiling n-queens v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::process`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::process;
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.08s
[INFO] running `"docker" "inspect" "65403713f9d23b8de8dc605b25084823d1096bd4085a81f09f7b55816381c782"`
[INFO] running `"docker" "rm" "-f" "65403713f9d23b8de8dc605b25084823d1096bd4085a81f09f7b55816381c782"`
[INFO] [stdout] 65403713f9d23b8de8dc605b25084823d1096bd4085a81f09f7b55816381c782
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/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/Regan-Koopmans/n-queens:/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] ef2d974f53149ee7b1a17ebbdada2f7b2d3fcf684eb8cf38121c8be42207811e
[INFO] running `"docker" "start" "-a" "ef2d974f53149ee7b1a17ebbdada2f7b2d3fcf684eb8cf38121c8be42207811e"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling n-queens v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::process`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::process;
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `"docker" "inspect" "ef2d974f53149ee7b1a17ebbdada2f7b2d3fcf684eb8cf38121c8be42207811e"`
[INFO] running `"docker" "rm" "-f" "ef2d974f53149ee7b1a17ebbdada2f7b2d3fcf684eb8cf38121c8be42207811e"`
[INFO] [stdout] ef2d974f53149ee7b1a17ebbdada2f7b2d3fcf684eb8cf38121c8be42207811e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/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/Regan-Koopmans/n-queens:/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] b945568a8d2e60a9e108cf8d79872a63cbdc16ff3eb908739355bf7e8da8896e
[INFO] running `"docker" "start" "-a" "b945568a8d2e60a9e108cf8d79872a63cbdc16ff3eb908739355bf7e8da8896e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/n_queens-ec28f6d7e9028cdd
[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" "b945568a8d2e60a9e108cf8d79872a63cbdc16ff3eb908739355bf7e8da8896e"`
[INFO] running `"docker" "rm" "-f" "b945568a8d2e60a9e108cf8d79872a63cbdc16ff3eb908739355bf7e8da8896e"`
[INFO] [stdout] b945568a8d2e60a9e108cf8d79872a63cbdc16ff3eb908739355bf7e8da8896e