[INFO] updating cached repository bon-chi/tower_of_hanoi_in_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bon-chi/tower_of_hanoi_in_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bon-chi/tower_of_hanoi_in_rust" "work/ex/beta-1.37-6/sources/1.36.0/gh/bon-chi/tower_of_hanoi_in_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/bon-chi/tower_of_hanoi_in_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bon-chi/tower_of_hanoi_in_rust" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bon-chi/tower_of_hanoi_in_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bon-chi/tower_of_hanoi_in_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6db73d2b8c4a3dffb5c55025cbf3bd44d5188ab2
[INFO] sha for GitHub repo bon-chi/tower_of_hanoi_in_rust: 6db73d2b8c4a3dffb5c55025cbf3bd44d5188ab2
[INFO] validating manifest of bon-chi/tower_of_hanoi_in_rust 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 bon-chi/tower_of_hanoi_in_rust 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 bon-chi/tower_of_hanoi_in_rust
[INFO] finished frobbing bon-chi/tower_of_hanoi_in_rust
[INFO] frobbed toml for bon-chi/tower_of_hanoi_in_rust written to work/ex/beta-1.37-6/sources/1.36.0/gh/bon-chi/tower_of_hanoi_in_rust/Cargo.toml
[INFO] started frobbing bon-chi/tower_of_hanoi_in_rust
[INFO] finished frobbing bon-chi/tower_of_hanoi_in_rust
[INFO] frobbed toml for bon-chi/tower_of_hanoi_in_rust written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bon-chi/tower_of_hanoi_in_rust/Cargo.toml
[INFO] crate bon-chi/tower_of_hanoi_in_rust 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 bon-chi/tower_of_hanoi_in_rust 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-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/bon-chi/tower_of_hanoi_in_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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 60944e8a07e20b329797e7ce1e1d87436ad3bfa4cec2070e4b93ef82b5fff787
[INFO] running `"docker" "start" "-a" "60944e8a07e20b329797e7ce1e1d87436ad3bfa4cec2070e4b93ef82b5fff787"`
[INFO] [stderr]    Compiling tower_of_hanoi_in_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let mut new_stream: &mut Vec<i32> = &mut hanoi_stream(n - 1, h1);
[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 0.81s
[INFO] running `"docker" "inspect" "60944e8a07e20b329797e7ce1e1d87436ad3bfa4cec2070e4b93ef82b5fff787"`
[INFO] running `"docker" "rm" "-f" "60944e8a07e20b329797e7ce1e1d87436ad3bfa4cec2070e4b93ef82b5fff787"`
[INFO] [stdout] 60944e8a07e20b329797e7ce1e1d87436ad3bfa4cec2070e4b93ef82b5fff787
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/bon-chi/tower_of_hanoi_in_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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 4c7305e618d34a8f2e8288f7a54c7883638c79ed0d55d3c1b22c24fd7f44b3f3
[INFO] running `"docker" "start" "-a" "4c7305e618d34a8f2e8288f7a54c7883638c79ed0d55d3c1b22c24fd7f44b3f3"`
[INFO] [stderr]    Compiling tower_of_hanoi_in_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let mut new_stream: &mut Vec<i32> = &mut hanoi_stream(n - 1, h1);
[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 0.71s
[INFO] running `"docker" "inspect" "4c7305e618d34a8f2e8288f7a54c7883638c79ed0d55d3c1b22c24fd7f44b3f3"`
[INFO] running `"docker" "rm" "-f" "4c7305e618d34a8f2e8288f7a54c7883638c79ed0d55d3c1b22c24fd7f44b3f3"`
[INFO] [stdout] 4c7305e618d34a8f2e8288f7a54c7883638c79ed0d55d3c1b22c24fd7f44b3f3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/bon-chi/tower_of_hanoi_in_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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] acac2d0ca5ffb99ee7d0fcbafd3efb46095acc83b8c5c8bd4cd4a82103bb7948
[INFO] running `"docker" "start" "-a" "acac2d0ca5ffb99ee7d0fcbafd3efb46095acc83b8c5c8bd4cd4a82103bb7948"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/tower_of_hanoi_in_rust-f17de7c183e66b15
[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" "acac2d0ca5ffb99ee7d0fcbafd3efb46095acc83b8c5c8bd4cd4a82103bb7948"`
[INFO] running `"docker" "rm" "-f" "acac2d0ca5ffb99ee7d0fcbafd3efb46095acc83b8c5c8bd4cd4a82103bb7948"`
[INFO] [stdout] acac2d0ca5ffb99ee7d0fcbafd3efb46095acc83b8c5c8bd4cd4a82103bb7948