[INFO] updating cached repository truedoomboom/IntroductionToRust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/truedoomboom/IntroductionToRust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/truedoomboom/IntroductionToRust" "work/ex/beta-1.38-1/sources/1.37.0/gh/truedoomboom/IntroductionToRust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/truedoomboom/IntroductionToRust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/truedoomboom/IntroductionToRust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/truedoomboom/IntroductionToRust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/truedoomboom/IntroductionToRust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f688a7a7bcacb24629919470bb46375efc9c6257
[INFO] sha for GitHub repo truedoomboom/IntroductionToRust: f688a7a7bcacb24629919470bb46375efc9c6257
[INFO] validating manifest of truedoomboom/IntroductionToRust 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 truedoomboom/IntroductionToRust 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 truedoomboom/IntroductionToRust
[INFO] finished frobbing truedoomboom/IntroductionToRust
[INFO] frobbed toml for truedoomboom/IntroductionToRust written to work/ex/beta-1.38-1/sources/1.37.0/gh/truedoomboom/IntroductionToRust/Cargo.toml
[INFO] started frobbing truedoomboom/IntroductionToRust
[INFO] finished frobbing truedoomboom/IntroductionToRust
[INFO] frobbed toml for truedoomboom/IntroductionToRust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/truedoomboom/IntroductionToRust/Cargo.toml
[INFO] crate truedoomboom/IntroductionToRust 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 truedoomboom/IntroductionToRust 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-4/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/truedoomboom/IntroductionToRust:/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] c68a304f5288043c2fc6c0e612a7d0d1ceb2e316f45b13c44b67a2758d0ac47b
[INFO] running `"docker" "start" "-a" "c68a304f5288043c2fc6c0e612a7d0d1ceb2e316f45b13c44b67a2758d0ac47b"`
[INFO] [stderr]    Compiling RustProj v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/types.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |     let x = 1;
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: crate `RustProj` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `rust_proj`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `"docker" "inspect" "c68a304f5288043c2fc6c0e612a7d0d1ceb2e316f45b13c44b67a2758d0ac47b"`
[INFO] running `"docker" "rm" "-f" "c68a304f5288043c2fc6c0e612a7d0d1ceb2e316f45b13c44b67a2758d0ac47b"`
[INFO] [stdout] c68a304f5288043c2fc6c0e612a7d0d1ceb2e316f45b13c44b67a2758d0ac47b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/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/truedoomboom/IntroductionToRust:/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] 5785f0290226ea89c3c759e6899961ff32d2b670004c0e5193ac814e965e784c
[INFO] running `"docker" "start" "-a" "5785f0290226ea89c3c759e6899961ff32d2b670004c0e5193ac814e965e784c"`
[INFO] [stderr]    Compiling RustProj v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/types.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |     let x = 1;
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: crate `RustProj` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `rust_proj`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.70s
[INFO] running `"docker" "inspect" "5785f0290226ea89c3c759e6899961ff32d2b670004c0e5193ac814e965e784c"`
[INFO] running `"docker" "rm" "-f" "5785f0290226ea89c3c759e6899961ff32d2b670004c0e5193ac814e965e784c"`
[INFO] [stdout] 5785f0290226ea89c3c759e6899961ff32d2b670004c0e5193ac814e965e784c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/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/truedoomboom/IntroductionToRust:/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] 675153d07f72c6798c9ddac773aa06247a60459812e7856c3e910fe84d6d01f2
[INFO] running `"docker" "start" "-a" "675153d07f72c6798c9ddac773aa06247a60459812e7856c3e910fe84d6d01f2"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/RustProj-88c7fe504eb4550d
[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" "675153d07f72c6798c9ddac773aa06247a60459812e7856c3e910fe84d6d01f2"`
[INFO] running `"docker" "rm" "-f" "675153d07f72c6798c9ddac773aa06247a60459812e7856c3e910fe84d6d01f2"`
[INFO] [stdout] 675153d07f72c6798c9ddac773aa06247a60459812e7856c3e910fe84d6d01f2