[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 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-7/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/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] dff71aeaf7961fb33e9211869623370fde3b5c3f5554eec567c88f652677ca8e
[INFO] running `"docker" "start" "-a" "dff71aeaf7961fb33e9211869623370fde3b5c3f5554eec567c88f652677ca8e"`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling syn v0.15.39
[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 21.24s
[INFO] running `"docker" "inspect" "dff71aeaf7961fb33e9211869623370fde3b5c3f5554eec567c88f652677ca8e"`
[INFO] running `"docker" "rm" "-f" "dff71aeaf7961fb33e9211869623370fde3b5c3f5554eec567c88f652677ca8e"`
[INFO] [stdout] dff71aeaf7961fb33e9211869623370fde3b5c3f5554eec567c88f652677ca8e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/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/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] cab9ba4048321bf2b6691b203221ba7206527f3482bbf7aba73835338ab4864c
[INFO] running `"docker" "start" "-a" "cab9ba4048321bf2b6691b203221ba7206527f3482bbf7aba73835338ab4864c"`
[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 0.75s
[INFO] running `"docker" "inspect" "cab9ba4048321bf2b6691b203221ba7206527f3482bbf7aba73835338ab4864c"`
[INFO] running `"docker" "rm" "-f" "cab9ba4048321bf2b6691b203221ba7206527f3482bbf7aba73835338ab4864c"`
[INFO] [stdout] cab9ba4048321bf2b6691b203221ba7206527f3482bbf7aba73835338ab4864c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/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/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 2f1bb9efbb776a8b3e1635a6f2bcc7f3b57c34ff7c0a392ade62fcff1ce7fa48
[INFO] running `"docker" "start" "-a" "2f1bb9efbb776a8b3e1635a6f2bcc7f3b57c34ff7c0a392ade62fcff1ce7fa48"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/network_sample-a46dc5db649f14ee
[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" "2f1bb9efbb776a8b3e1635a6f2bcc7f3b57c34ff7c0a392ade62fcff1ce7fa48"`
[INFO] running `"docker" "rm" "-f" "2f1bb9efbb776a8b3e1635a6f2bcc7f3b57c34ff7c0a392ade62fcff1ce7fa48"`
[INFO] [stdout] 2f1bb9efbb776a8b3e1635a6f2bcc7f3b57c34ff7c0a392ade62fcff1ce7fa48