[INFO] updating cached repository zhangaz1/TheRustProgrammingLanguageBookExamples
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/zhangaz1/TheRustProgrammingLanguageBookExamples
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/zhangaz1/TheRustProgrammingLanguageBookExamples" "work/ex/beta-1.37-6/sources/1.36.0/gh/zhangaz1/TheRustProgrammingLanguageBookExamples"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/zhangaz1/TheRustProgrammingLanguageBookExamples'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/zhangaz1/TheRustProgrammingLanguageBookExamples" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/zhangaz1/TheRustProgrammingLanguageBookExamples"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/zhangaz1/TheRustProgrammingLanguageBookExamples'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e201eb3f6b6dc3622e535f5ae1a33ae2e06267f6
[INFO] sha for GitHub repo zhangaz1/TheRustProgrammingLanguageBookExamples: e201eb3f6b6dc3622e535f5ae1a33ae2e06267f6
[INFO] validating manifest of zhangaz1/TheRustProgrammingLanguageBookExamples 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 zhangaz1/TheRustProgrammingLanguageBookExamples 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 zhangaz1/TheRustProgrammingLanguageBookExamples
[INFO] finished frobbing zhangaz1/TheRustProgrammingLanguageBookExamples
[INFO] frobbed toml for zhangaz1/TheRustProgrammingLanguageBookExamples written to work/ex/beta-1.37-6/sources/1.36.0/gh/zhangaz1/TheRustProgrammingLanguageBookExamples/Cargo.toml
[INFO] started frobbing zhangaz1/TheRustProgrammingLanguageBookExamples
[INFO] finished frobbing zhangaz1/TheRustProgrammingLanguageBookExamples
[INFO] frobbed toml for zhangaz1/TheRustProgrammingLanguageBookExamples written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/zhangaz1/TheRustProgrammingLanguageBookExamples/Cargo.toml
[INFO] crate zhangaz1/TheRustProgrammingLanguageBookExamples 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 zhangaz1/TheRustProgrammingLanguageBookExamples 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-0/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/zhangaz1/TheRustProgrammingLanguageBookExamples:/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] abeb7c8ff55e637c8298c4546794883b72c9ba6a3685e7602f99ce13c0e73e9b
[INFO] running `"docker" "start" "-a" "abeb7c8ff55e637c8298c4546794883b72c9ba6a3685e7602f99ce13c0e73e9b"`
[INFO] [stderr]    Compiling TheRustProgrammingLanguageBookExamples v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]  --> src/main.rs:5:13
[INFO] [stderr]   |
[INFO] [stderr] 5 |         let y = &x[0];
[INFO] [stderr]   |             ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: crate `TheRustProgrammingLanguageBookExamples` 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: `the_rust_programming_language_book_examples`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.66s
[INFO] running `"docker" "inspect" "abeb7c8ff55e637c8298c4546794883b72c9ba6a3685e7602f99ce13c0e73e9b"`
[INFO] running `"docker" "rm" "-f" "abeb7c8ff55e637c8298c4546794883b72c9ba6a3685e7602f99ce13c0e73e9b"`
[INFO] [stdout] abeb7c8ff55e637c8298c4546794883b72c9ba6a3685e7602f99ce13c0e73e9b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/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/zhangaz1/TheRustProgrammingLanguageBookExamples:/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] d8a71666fa05844df0bee0ff3f526ba87eb82774d1c67a2a84a8c4ef776a3d4f
[INFO] running `"docker" "start" "-a" "d8a71666fa05844df0bee0ff3f526ba87eb82774d1c67a2a84a8c4ef776a3d4f"`
[INFO] [stderr]    Compiling TheRustProgrammingLanguageBookExamples v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]  --> src/main.rs:5:13
[INFO] [stderr]   |
[INFO] [stderr] 5 |         let y = &x[0];
[INFO] [stderr]   |             ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: crate `TheRustProgrammingLanguageBookExamples` 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: `the_rust_programming_language_book_examples`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.70s
[INFO] running `"docker" "inspect" "d8a71666fa05844df0bee0ff3f526ba87eb82774d1c67a2a84a8c4ef776a3d4f"`
[INFO] running `"docker" "rm" "-f" "d8a71666fa05844df0bee0ff3f526ba87eb82774d1c67a2a84a8c4ef776a3d4f"`
[INFO] [stdout] d8a71666fa05844df0bee0ff3f526ba87eb82774d1c67a2a84a8c4ef776a3d4f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/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/zhangaz1/TheRustProgrammingLanguageBookExamples:/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] 08c8337240db77d470eb7b21cefc572df4bdc4790bdc864b8a305142ca1141ec
[INFO] running `"docker" "start" "-a" "08c8337240db77d470eb7b21cefc572df4bdc4790bdc864b8a305142ca1141ec"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/TheRustProgrammingLanguageBookExamples-5ac9faa42e57b7b9
[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" "08c8337240db77d470eb7b21cefc572df4bdc4790bdc864b8a305142ca1141ec"`
[INFO] running `"docker" "rm" "-f" "08c8337240db77d470eb7b21cefc572df4bdc4790bdc864b8a305142ca1141ec"`
[INFO] [stdout] 08c8337240db77d470eb7b21cefc572df4bdc4790bdc864b8a305142ca1141ec