[INFO] updating cached repository jeorb/icfp2006
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jeorb/icfp2006
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jeorb/icfp2006" "work/ex/beta-1.38-1/sources/1.37.0/gh/jeorb/icfp2006"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jeorb/icfp2006'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jeorb/icfp2006" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jeorb/icfp2006"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jeorb/icfp2006'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1d5dce52c26800e02857ae5f260791fef6450b46
[INFO] sha for GitHub repo jeorb/icfp2006: 1d5dce52c26800e02857ae5f260791fef6450b46
[INFO] validating manifest of jeorb/icfp2006 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 jeorb/icfp2006 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 jeorb/icfp2006
[INFO] finished frobbing jeorb/icfp2006
[INFO] frobbed toml for jeorb/icfp2006 written to work/ex/beta-1.38-1/sources/1.37.0/gh/jeorb/icfp2006/Cargo.toml
[INFO] started frobbing jeorb/icfp2006
[INFO] finished frobbing jeorb/icfp2006
[INFO] frobbed toml for jeorb/icfp2006 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jeorb/icfp2006/Cargo.toml
[INFO] crate jeorb/icfp2006 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing jeorb/icfp2006 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-5/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/jeorb/icfp2006:/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] 3d990b8defa074d6b4a7dfc9490b25e8df75f5a2a7233e694e108688b5087f4d
[INFO] running `"docker" "start" "-a" "3d990b8defa074d6b4a7dfc9490b25e8df75f5a2a7233e694e108688b5087f4d"`
[INFO] [stderr]    Compiling icfp2006 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `dump_file` is never read
[INFO] [stderr]   --> src/main.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let mut dump_file = "".to_owned();
[INFO] [stderr]    |             ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `"docker" "inspect" "3d990b8defa074d6b4a7dfc9490b25e8df75f5a2a7233e694e108688b5087f4d"`
[INFO] running `"docker" "rm" "-f" "3d990b8defa074d6b4a7dfc9490b25e8df75f5a2a7233e694e108688b5087f4d"`
[INFO] [stdout] 3d990b8defa074d6b4a7dfc9490b25e8df75f5a2a7233e694e108688b5087f4d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/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/jeorb/icfp2006:/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] e5c0f4d1740fde86aed369243c6a07fc54475a445a7455d789d467b6eba1c382
[INFO] running `"docker" "start" "-a" "e5c0f4d1740fde86aed369243c6a07fc54475a445a7455d789d467b6eba1c382"`
[INFO] [stderr]    Compiling icfp2006 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `dump_file` is never read
[INFO] [stderr]   --> src/main.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let mut dump_file = "".to_owned();
[INFO] [stderr]    |             ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.66s
[INFO] running `"docker" "inspect" "e5c0f4d1740fde86aed369243c6a07fc54475a445a7455d789d467b6eba1c382"`
[INFO] running `"docker" "rm" "-f" "e5c0f4d1740fde86aed369243c6a07fc54475a445a7455d789d467b6eba1c382"`
[INFO] [stdout] e5c0f4d1740fde86aed369243c6a07fc54475a445a7455d789d467b6eba1c382
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/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/jeorb/icfp2006:/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] 6c63d4ab1503b8ebf6973b25dc601708422f4e9ae53bfc514142b97b5d8e16c5
[INFO] running `"docker" "start" "-a" "6c63d4ab1503b8ebf6973b25dc601708422f4e9ae53bfc514142b97b5d8e16c5"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/icfp2006-eff31d1d763c523e
[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" "6c63d4ab1503b8ebf6973b25dc601708422f4e9ae53bfc514142b97b5d8e16c5"`
[INFO] running `"docker" "rm" "-f" "6c63d4ab1503b8ebf6973b25dc601708422f4e9ae53bfc514142b97b5d8e16c5"`
[INFO] [stdout] 6c63d4ab1503b8ebf6973b25dc601708422f4e9ae53bfc514142b97b5d8e16c5