[INFO] updating cached repository shterrett/rust-concurrency-tutorial
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/shterrett/rust-concurrency-tutorial
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/shterrett/rust-concurrency-tutorial" "work/ex/beta-1.38-1/sources/1.37.0/gh/shterrett/rust-concurrency-tutorial"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/shterrett/rust-concurrency-tutorial'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/shterrett/rust-concurrency-tutorial" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/shterrett/rust-concurrency-tutorial"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/shterrett/rust-concurrency-tutorial'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6d01f54064f6d679bbccd8da7a98835b5b216243
[INFO] sha for GitHub repo shterrett/rust-concurrency-tutorial: 6d01f54064f6d679bbccd8da7a98835b5b216243
[INFO] validating manifest of shterrett/rust-concurrency-tutorial 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 shterrett/rust-concurrency-tutorial 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 shterrett/rust-concurrency-tutorial
[INFO] finished frobbing shterrett/rust-concurrency-tutorial
[INFO] frobbed toml for shterrett/rust-concurrency-tutorial written to work/ex/beta-1.38-1/sources/1.37.0/gh/shterrett/rust-concurrency-tutorial/Cargo.toml
[INFO] started frobbing shterrett/rust-concurrency-tutorial
[INFO] finished frobbing shterrett/rust-concurrency-tutorial
[INFO] frobbed toml for shterrett/rust-concurrency-tutorial written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/shterrett/rust-concurrency-tutorial/Cargo.toml
[INFO] crate shterrett/rust-concurrency-tutorial 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 shterrett/rust-concurrency-tutorial 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-5/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/shterrett/rust-concurrency-tutorial:/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] a72986e5be447d8ba23fd06ef7cf8bfccca429bedae93e74e20f7f029e5f2bc0
[INFO] running `"docker" "start" "-a" "a72986e5be447d8ba23fd06ef7cf8bfccca429bedae93e74e20f7f029e5f2bc0"`
[INFO] [stderr]    Compiling chan v0.1.19
[INFO] [stderr]    Compiling rust-concurrency-tutorial v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.35s
[INFO] running `"docker" "inspect" "a72986e5be447d8ba23fd06ef7cf8bfccca429bedae93e74e20f7f029e5f2bc0"`
[INFO] running `"docker" "rm" "-f" "a72986e5be447d8ba23fd06ef7cf8bfccca429bedae93e74e20f7f029e5f2bc0"`
[INFO] [stdout] a72986e5be447d8ba23fd06ef7cf8bfccca429bedae93e74e20f7f029e5f2bc0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/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/shterrett/rust-concurrency-tutorial:/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] 8fe9232c6f2bfd50397c0d23df07dcee31e578621e9ac4832f48b53ff3f35cab
[INFO] running `"docker" "start" "-a" "8fe9232c6f2bfd50397c0d23df07dcee31e578621e9ac4832f48b53ff3f35cab"`
[INFO] [stderr]    Compiling rust-concurrency-tutorial v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.88s
[INFO] running `"docker" "inspect" "8fe9232c6f2bfd50397c0d23df07dcee31e578621e9ac4832f48b53ff3f35cab"`
[INFO] running `"docker" "rm" "-f" "8fe9232c6f2bfd50397c0d23df07dcee31e578621e9ac4832f48b53ff3f35cab"`
[INFO] [stdout] 8fe9232c6f2bfd50397c0d23df07dcee31e578621e9ac4832f48b53ff3f35cab
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/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/shterrett/rust-concurrency-tutorial:/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] 4c580bbf500fca6fdd867cd62bf5f64d09acba319ec36e0ce60fc0bc7e65cd97
[INFO] running `"docker" "start" "-a" "4c580bbf500fca6fdd867cd62bf5f64d09acba319ec36e0ce60fc0bc7e65cd97"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_concurrency_tutorial-64d848f95502de83
[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" "4c580bbf500fca6fdd867cd62bf5f64d09acba319ec36e0ce60fc0bc7e65cd97"`
[INFO] running `"docker" "rm" "-f" "4c580bbf500fca6fdd867cd62bf5f64d09acba319ec36e0ce60fc0bc7e65cd97"`
[INFO] [stdout] 4c580bbf500fca6fdd867cd62bf5f64d09acba319ec36e0ce60fc0bc7e65cd97