[INFO] updating cached repository elycruz/rust-book
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/elycruz/rust-book
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/elycruz/rust-book" "work/ex/beta-1.37-6/sources/1.36.0/gh/elycruz/rust-book"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/elycruz/rust-book'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/elycruz/rust-book" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/elycruz/rust-book"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/elycruz/rust-book'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cd9266b6c61f2b69f353735e61512e1d19bc9fb5
[INFO] sha for GitHub repo elycruz/rust-book: cd9266b6c61f2b69f353735e61512e1d19bc9fb5
[INFO] validating manifest of elycruz/rust-book 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 elycruz/rust-book 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 elycruz/rust-book
[INFO] finished frobbing elycruz/rust-book
[INFO] frobbed toml for elycruz/rust-book written to work/ex/beta-1.37-6/sources/1.36.0/gh/elycruz/rust-book/Cargo.toml
[INFO] started frobbing elycruz/rust-book
[INFO] finished frobbing elycruz/rust-book
[INFO] frobbed toml for elycruz/rust-book written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/elycruz/rust-book/Cargo.toml
[INFO] crate elycruz/rust-book 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing elycruz/rust-book 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/elycruz/rust-book:/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] 4b9d53d7f53123ccd61a25c1ef7dcace5a35e0e37285f4642151ff57b4278a71
[INFO] running `"docker" "start" "-a" "4b9d53d7f53123ccd61a25c1ef7dcace5a35e0e37285f4642151ff57b4278a71"`
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]    Compiling rust-book v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `maximum`
[INFO] [stderr]   --> src/chp8/main.rs:45:1
[INFO] [stderr]    |
[INFO] [stderr] 45 | fn maximum<T: Ord + Debug>(xs: &Vec<T>) -> Option<&T> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.08s
[INFO] running `"docker" "inspect" "4b9d53d7f53123ccd61a25c1ef7dcace5a35e0e37285f4642151ff57b4278a71"`
[INFO] running `"docker" "rm" "-f" "4b9d53d7f53123ccd61a25c1ef7dcace5a35e0e37285f4642151ff57b4278a71"`
[INFO] [stdout] 4b9d53d7f53123ccd61a25c1ef7dcace5a35e0e37285f4642151ff57b4278a71
[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/elycruz/rust-book:/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] bb76422c53e936a2dacd7ef13aeff2877f34c23963af8f2f436c6cc0ab337fbc
[INFO] running `"docker" "start" "-a" "bb76422c53e936a2dacd7ef13aeff2877f34c23963af8f2f436c6cc0ab337fbc"`
[INFO] [stderr]    Compiling rust-book v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.57s
[INFO] running `"docker" "inspect" "bb76422c53e936a2dacd7ef13aeff2877f34c23963af8f2f436c6cc0ab337fbc"`
[INFO] running `"docker" "rm" "-f" "bb76422c53e936a2dacd7ef13aeff2877f34c23963af8f2f436c6cc0ab337fbc"`
[INFO] [stdout] bb76422c53e936a2dacd7ef13aeff2877f34c23963af8f2f436c6cc0ab337fbc
[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/elycruz/rust-book:/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] c01f776e60bf203618d98b71cb3e002c5ce913b8c07a609f40b11cedc30324ad
[INFO] running `"docker" "start" "-a" "c01f776e60bf203618d98b71cb3e002c5ce913b8c07a609f40b11cedc30324ad"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/chp12-bba85018d597c0fd
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test minigrep::tests::test_case_insensitive ... ok
[INFO] [stdout] test minigrep::tests::test_one_result ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/chp2-5f2a08d85a6cfee1
[INFO] [stderr]      Running /opt/crater/target/debug/deps/chp5-c1b4449e12b85caf
[INFO] [stderr]      Running /opt/crater/target/debug/deps/chp8-109804a7151ab37f
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_book-eea405b4a118308e
[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] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::test_maximum ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 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" "c01f776e60bf203618d98b71cb3e002c5ce913b8c07a609f40b11cedc30324ad"`
[INFO] running `"docker" "rm" "-f" "c01f776e60bf203618d98b71cb3e002c5ce913b8c07a609f40b11cedc30324ad"`
[INFO] [stdout] c01f776e60bf203618d98b71cb3e002c5ce913b8c07a609f40b11cedc30324ad