[INFO] updating cached repository minaduking/network_sample
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/minaduking/network_sample
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/minaduking/network_sample" "work/ex/beta-1.38-1/sources/1.37.0/gh/minaduking/network_sample"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/minaduking/network_sample'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/minaduking/network_sample" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/minaduking/network_sample"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/minaduking/network_sample'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b16df507af73b5912c58dea95c22459008708524
[INFO] sha for GitHub repo minaduking/network_sample: b16df507af73b5912c58dea95c22459008708524
[INFO] validating manifest of minaduking/network_sample 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 minaduking/network_sample 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 minaduking/network_sample
[INFO] finished frobbing minaduking/network_sample
[INFO] frobbed toml for minaduking/network_sample written to work/ex/beta-1.38-1/sources/1.37.0/gh/minaduking/network_sample/Cargo.toml
[INFO] started frobbing minaduking/network_sample
[INFO] finished frobbing minaduking/network_sample
[INFO] frobbed toml for minaduking/network_sample written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/minaduking/network_sample/Cargo.toml
[INFO] crate minaduking/network_sample 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing minaduking/network_sample against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/minaduking/network_sample:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 04dc0f649373cecfd37af5479fd08e28de7013303c634bb57c6eca7abf6217bf
[INFO] running `"docker" "start" "-a" "04dc0f649373cecfd37af5479fd08e28de7013303c634bb57c6eca7abf6217bf"`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling regex v1.1.9
[INFO] [stderr]    Compiling backtrace-sys v0.1.30
[INFO] [stderr]    Compiling atty v0.2.13
[INFO] [stderr]    Compiling backtrace v0.3.32
[INFO] [stderr]    Compiling env_logger v0.6.2
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling network_sample v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/tcp_server.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |         stream.write_all(&buffer[..nbytes]);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 25.29s
[INFO] running `"docker" "inspect" "04dc0f649373cecfd37af5479fd08e28de7013303c634bb57c6eca7abf6217bf"`
[INFO] running `"docker" "rm" "-f" "04dc0f649373cecfd37af5479fd08e28de7013303c634bb57c6eca7abf6217bf"`
[INFO] [stdout] 04dc0f649373cecfd37af5479fd08e28de7013303c634bb57c6eca7abf6217bf
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/minaduking/network_sample:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 9d79034a9c63c261141c0b7db3cabbea74b519a13e73bf1b7bf806bce0b3b1c9
[INFO] running `"docker" "start" "-a" "9d79034a9c63c261141c0b7db3cabbea74b519a13e73bf1b7bf806bce0b3b1c9"`
[INFO] [stderr]    Compiling network_sample v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/tcp_server.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |         stream.write_all(&buffer[..nbytes]);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.00s
[INFO] running `"docker" "inspect" "9d79034a9c63c261141c0b7db3cabbea74b519a13e73bf1b7bf806bce0b3b1c9"`
[INFO] running `"docker" "rm" "-f" "9d79034a9c63c261141c0b7db3cabbea74b519a13e73bf1b7bf806bce0b3b1c9"`
[INFO] [stdout] 9d79034a9c63c261141c0b7db3cabbea74b519a13e73bf1b7bf806bce0b3b1c9
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/minaduking/network_sample:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 1aa9d357399eb7c657c0c6f88c1f864c7339f63a8129587654ddc02d5f8b04df
[INFO] running `"docker" "start" "-a" "1aa9d357399eb7c657c0c6f88c1f864c7339f63a8129587654ddc02d5f8b04df"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/network_sample-f0ab6792becd4211
[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" "1aa9d357399eb7c657c0c6f88c1f864c7339f63a8129587654ddc02d5f8b04df"`
[INFO] running `"docker" "rm" "-f" "1aa9d357399eb7c657c0c6f88c1f864c7339f63a8129587654ddc02d5f8b04df"`
[INFO] [stdout] 1aa9d357399eb7c657c0c6f88c1f864c7339f63a8129587654ddc02d5f8b04df