[INFO] updating cached repository phisixersai/guessing_game
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/phisixersai/guessing_game
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/phisixersai/guessing_game" "work/ex/beta-1.38-1/sources/1.37.0/gh/phisixersai/guessing_game"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/phisixersai/guessing_game'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/phisixersai/guessing_game" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/phisixersai/guessing_game"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/phisixersai/guessing_game'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] abe67970984c8b77c69fc11c057a26a9753a42c4
[INFO] sha for GitHub repo phisixersai/guessing_game: abe67970984c8b77c69fc11c057a26a9753a42c4
[INFO] validating manifest of phisixersai/guessing_game 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 phisixersai/guessing_game 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 phisixersai/guessing_game
[INFO] finished frobbing phisixersai/guessing_game
[INFO] frobbed toml for phisixersai/guessing_game written to work/ex/beta-1.38-1/sources/1.37.0/gh/phisixersai/guessing_game/Cargo.toml
[INFO] started frobbing phisixersai/guessing_game
[INFO] finished frobbing phisixersai/guessing_game
[INFO] frobbed toml for phisixersai/guessing_game written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/phisixersai/guessing_game/Cargo.toml
[INFO] crate phisixersai/guessing_game 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 phisixersai/guessing_game 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-0/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/phisixersai/guessing_game:/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] 6e1e057f564c884aee0051eb355f61d8ee879fa7e7009878537a93256bda1797
[INFO] running `"docker" "start" "-a" "6e1e057f564c884aee0051eb355f61d8ee879fa7e7009878537a93256bda1797"`
[INFO] [stderr]    Compiling libc v0.2.22
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling guessing_game v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `err`
[INFO] [stderr]   --> src/main.rs:22:17
[INFO] [stderr]    |
[INFO] [stderr] 22 |             Err(err) => {
[INFO] [stderr]    |                 ^^^ help: consider prefixing with an underscore: `_err`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.52s
[INFO] running `"docker" "inspect" "6e1e057f564c884aee0051eb355f61d8ee879fa7e7009878537a93256bda1797"`
[INFO] running `"docker" "rm" "-f" "6e1e057f564c884aee0051eb355f61d8ee879fa7e7009878537a93256bda1797"`
[INFO] [stdout] 6e1e057f564c884aee0051eb355f61d8ee879fa7e7009878537a93256bda1797
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/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/phisixersai/guessing_game:/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] e9093ac81a10ace759d28d8c37a3f8dd224d24fea54373308169a67389065baa
[INFO] running `"docker" "start" "-a" "e9093ac81a10ace759d28d8c37a3f8dd224d24fea54373308169a67389065baa"`
[INFO] [stderr]    Compiling guessing_game v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `err`
[INFO] [stderr]   --> src/main.rs:22:17
[INFO] [stderr]    |
[INFO] [stderr] 22 |             Err(err) => {
[INFO] [stderr]    |                 ^^^ help: consider prefixing with an underscore: `_err`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.43s
[INFO] running `"docker" "inspect" "e9093ac81a10ace759d28d8c37a3f8dd224d24fea54373308169a67389065baa"`
[INFO] running `"docker" "rm" "-f" "e9093ac81a10ace759d28d8c37a3f8dd224d24fea54373308169a67389065baa"`
[INFO] [stdout] e9093ac81a10ace759d28d8c37a3f8dd224d24fea54373308169a67389065baa
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/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/phisixersai/guessing_game:/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] 39a6bef329650e5cc03ba40cc49ed94bcc123028ea2b3fbe3fff6660fc8d4b32
[INFO] running `"docker" "start" "-a" "39a6bef329650e5cc03ba40cc49ed94bcc123028ea2b3fbe3fff6660fc8d4b32"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/guessing_game-a631b6fb097575f1
[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" "39a6bef329650e5cc03ba40cc49ed94bcc123028ea2b3fbe3fff6660fc8d4b32"`
[INFO] running `"docker" "rm" "-f" "39a6bef329650e5cc03ba40cc49ed94bcc123028ea2b3fbe3fff6660fc8d4b32"`
[INFO] [stdout] 39a6bef329650e5cc03ba40cc49ed94bcc123028ea2b3fbe3fff6660fc8d4b32