[INFO] updating cached repository mrbkap/rust_guessing_game
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mrbkap/rust_guessing_game
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mrbkap/rust_guessing_game" "work/ex/beta-1.37-6/sources/1.36.0/gh/mrbkap/rust_guessing_game"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/mrbkap/rust_guessing_game'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mrbkap/rust_guessing_game" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mrbkap/rust_guessing_game"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mrbkap/rust_guessing_game'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0e2c3f4c9cabb3231abd78a63797520e4bec770e
[INFO] sha for GitHub repo mrbkap/rust_guessing_game: 0e2c3f4c9cabb3231abd78a63797520e4bec770e
[INFO] validating manifest of mrbkap/rust_guessing_game 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 mrbkap/rust_guessing_game 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 mrbkap/rust_guessing_game
[INFO] finished frobbing mrbkap/rust_guessing_game
[INFO] frobbed toml for mrbkap/rust_guessing_game written to work/ex/beta-1.37-6/sources/1.36.0/gh/mrbkap/rust_guessing_game/Cargo.toml
[INFO] started frobbing mrbkap/rust_guessing_game
[INFO] finished frobbing mrbkap/rust_guessing_game
[INFO] frobbed toml for mrbkap/rust_guessing_game written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mrbkap/rust_guessing_game/Cargo.toml
[INFO] crate mrbkap/rust_guessing_game 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/mrbkap/rust_guessing_game/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 mrbkap/rust_guessing_game against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mrbkap/rust_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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 4d7fb3e1b4c8afccc64094e83ff0e10d5406b48c6df3753212a970fb2c65cf66
[INFO] running `"docker" "start" "-a" "4d7fb3e1b4c8afccc64094e83ff0e10d5406b48c6df3753212a970fb2c65cf66"`
[INFO] [stderr]    Compiling guessing_game v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Read`
[INFO] [stderr]  --> solver/solver.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{Read,Write};
[INFO] [stderr]   |               ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.61s
[INFO] running `"docker" "inspect" "4d7fb3e1b4c8afccc64094e83ff0e10d5406b48c6df3753212a970fb2c65cf66"`
[INFO] running `"docker" "rm" "-f" "4d7fb3e1b4c8afccc64094e83ff0e10d5406b48c6df3753212a970fb2c65cf66"`
[INFO] [stdout] 4d7fb3e1b4c8afccc64094e83ff0e10d5406b48c6df3753212a970fb2c65cf66
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mrbkap/rust_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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] d5f24b01c906cfc23bf1e1469028731f2d5c820566027542c87732134e1fccf0
[INFO] running `"docker" "start" "-a" "d5f24b01c906cfc23bf1e1469028731f2d5c820566027542c87732134e1fccf0"`
[INFO] [stderr]    Compiling guessing_game v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Read`
[INFO] [stderr]  --> solver/solver.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{Read,Write};
[INFO] [stderr]   |               ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.98s
[INFO] running `"docker" "inspect" "d5f24b01c906cfc23bf1e1469028731f2d5c820566027542c87732134e1fccf0"`
[INFO] running `"docker" "rm" "-f" "d5f24b01c906cfc23bf1e1469028731f2d5c820566027542c87732134e1fccf0"`
[INFO] [stdout] d5f24b01c906cfc23bf1e1469028731f2d5c820566027542c87732134e1fccf0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mrbkap/rust_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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 0c94ee10e1c1a4b3d38553aae3170329685cc3ab0b8a6f820c7b2442ee6a7b9a
[INFO] running `"docker" "start" "-a" "0c94ee10e1c1a4b3d38553aae3170329685cc3ab0b8a6f820c7b2442ee6a7b9a"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/guessing_game-9a62590afabdfa6d
[INFO] [stderr]      Running /opt/crater/target/debug/deps/solver-e27d6b2ff0b0bb17
[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] [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" "0c94ee10e1c1a4b3d38553aae3170329685cc3ab0b8a6f820c7b2442ee6a7b9a"`
[INFO] running `"docker" "rm" "-f" "0c94ee10e1c1a4b3d38553aae3170329685cc3ab0b8a6f820c7b2442ee6a7b9a"`
[INFO] [stdout] 0c94ee10e1c1a4b3d38553aae3170329685cc3ab0b8a6f820c7b2442ee6a7b9a