[INFO] updating cached repository marcbreitung/problem-map-generator-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/marcbreitung/problem-map-generator-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/marcbreitung/problem-map-generator-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/marcbreitung/problem-map-generator-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/marcbreitung/problem-map-generator-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/marcbreitung/problem-map-generator-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/marcbreitung/problem-map-generator-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/marcbreitung/problem-map-generator-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e354237c833a9b9f15d0a2f9c757a86d6bcd8c99
[INFO] sha for GitHub repo marcbreitung/problem-map-generator-rust: e354237c833a9b9f15d0a2f9c757a86d6bcd8c99
[INFO] validating manifest of marcbreitung/problem-map-generator-rust 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 marcbreitung/problem-map-generator-rust 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 marcbreitung/problem-map-generator-rust
[INFO] finished frobbing marcbreitung/problem-map-generator-rust
[INFO] frobbed toml for marcbreitung/problem-map-generator-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/marcbreitung/problem-map-generator-rust/Cargo.toml
[INFO] started frobbing marcbreitung/problem-map-generator-rust
[INFO] finished frobbing marcbreitung/problem-map-generator-rust
[INFO] frobbed toml for marcbreitung/problem-map-generator-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/marcbreitung/problem-map-generator-rust/Cargo.toml
[INFO] crate marcbreitung/problem-map-generator-rust 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 marcbreitung/problem-map-generator-rust 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/marcbreitung/problem-map-generator-rust:/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] d9333a5e29c9db006feeb1712490204ac3a8b275964747d19ab0be472709df86
[INFO] running `"docker" "start" "-a" "d9333a5e29c9db006feeb1712490204ac3a8b275964747d19ab0be472709df86"`
[INFO] [stderr]    Compiling serde_json v1.0.11
[INFO] [stderr]    Compiling serde_derive_internals v0.20.1
[INFO] [stderr]    Compiling serde_derive v1.0.32
[INFO] [stderr]    Compiling problem_map_generator v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:46:13
[INFO] [stderr]    |
[INFO] [stderr] 46 |         let mut neighbours = get_neighbours(&leaves, &leave);
[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 11.39s
[INFO] running `"docker" "inspect" "d9333a5e29c9db006feeb1712490204ac3a8b275964747d19ab0be472709df86"`
[INFO] running `"docker" "rm" "-f" "d9333a5e29c9db006feeb1712490204ac3a8b275964747d19ab0be472709df86"`
[INFO] [stdout] d9333a5e29c9db006feeb1712490204ac3a8b275964747d19ab0be472709df86
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/marcbreitung/problem-map-generator-rust:/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] e8a4d4c70c46cc4e60b47d69b1e161cdbc3009c1b5d7a6f626b3bcc87ed910a9
[INFO] running `"docker" "start" "-a" "e8a4d4c70c46cc4e60b47d69b1e161cdbc3009c1b5d7a6f626b3bcc87ed910a9"`
[INFO] [stderr]    Compiling problem_map_generator v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:46:13
[INFO] [stderr]    |
[INFO] [stderr] 46 |         let mut neighbours = get_neighbours(&leaves, &leave);
[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 0.90s
[INFO] running `"docker" "inspect" "e8a4d4c70c46cc4e60b47d69b1e161cdbc3009c1b5d7a6f626b3bcc87ed910a9"`
[INFO] running `"docker" "rm" "-f" "e8a4d4c70c46cc4e60b47d69b1e161cdbc3009c1b5d7a6f626b3bcc87ed910a9"`
[INFO] [stdout] e8a4d4c70c46cc4e60b47d69b1e161cdbc3009c1b5d7a6f626b3bcc87ed910a9
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/marcbreitung/problem-map-generator-rust:/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] e2d6a270001f9291fc3aa9e2b9744d762fb2b637c51d19ef5e8a02ae39075979
[INFO] running `"docker" "start" "-a" "e2d6a270001f9291fc3aa9e2b9744d762fb2b637c51d19ef5e8a02ae39075979"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.30s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/problem_map_generator-894f016361d1bd88
[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" "e2d6a270001f9291fc3aa9e2b9744d762fb2b637c51d19ef5e8a02ae39075979"`
[INFO] running `"docker" "rm" "-f" "e2d6a270001f9291fc3aa9e2b9744d762fb2b637c51d19ef5e8a02ae39075979"`
[INFO] [stdout] e2d6a270001f9291fc3aa9e2b9744d762fb2b637c51d19ef5e8a02ae39075979