[INFO] updating cached repository wumingyue123/udp_client
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/wumingyue123/udp_client
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/wumingyue123/udp_client" "work/ex/beta-1.37-6/sources/1.36.0/gh/wumingyue123/udp_client"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/wumingyue123/udp_client'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/wumingyue123/udp_client" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/wumingyue123/udp_client"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/wumingyue123/udp_client'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9ba49e953a33c056daaa8c0e3aab70933d4fc10b
[INFO] sha for GitHub repo wumingyue123/udp_client: 9ba49e953a33c056daaa8c0e3aab70933d4fc10b
[INFO] validating manifest of wumingyue123/udp_client 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 wumingyue123/udp_client 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 wumingyue123/udp_client
[INFO] finished frobbing wumingyue123/udp_client
[INFO] frobbed toml for wumingyue123/udp_client written to work/ex/beta-1.37-6/sources/1.36.0/gh/wumingyue123/udp_client/Cargo.toml
[INFO] started frobbing wumingyue123/udp_client
[INFO] finished frobbing wumingyue123/udp_client
[INFO] frobbed toml for wumingyue123/udp_client written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/wumingyue123/udp_client/Cargo.toml
[INFO] crate wumingyue123/udp_client 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 wumingyue123/udp_client 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-5/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/wumingyue123/udp_client:/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] f4aa12b49b9ccb68068cb3074ad7f4e904d577458dad2b25fe7eb0d8b267765a
[INFO] running `"docker" "start" "-a" "f4aa12b49b9ccb68068cb3074ad7f4e904d577458dad2b25fe7eb0d8b267765a"`
[INFO] [stderr]    Compiling client_example v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let mut socket = UdpSocket::bind(LOCAL).expect("Failed to bind UDP server to address");
[INFO] [stderr]   |         ----^^^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     socket.set_nonblocking(false);
[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 0.68s
[INFO] running `"docker" "inspect" "f4aa12b49b9ccb68068cb3074ad7f4e904d577458dad2b25fe7eb0d8b267765a"`
[INFO] running `"docker" "rm" "-f" "f4aa12b49b9ccb68068cb3074ad7f4e904d577458dad2b25fe7eb0d8b267765a"`
[INFO] [stdout] f4aa12b49b9ccb68068cb3074ad7f4e904d577458dad2b25fe7eb0d8b267765a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/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/wumingyue123/udp_client:/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] 31bb475d8e1c8e302da956bf82a95faed12ea797cac57e28cfeaef1fc4c9975b
[INFO] running `"docker" "start" "-a" "31bb475d8e1c8e302da956bf82a95faed12ea797cac57e28cfeaef1fc4c9975b"`
[INFO] [stderr]    Compiling client_example v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let mut socket = UdpSocket::bind(LOCAL).expect("Failed to bind UDP server to address");
[INFO] [stderr]   |         ----^^^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     socket.set_nonblocking(false);
[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 0.55s
[INFO] running `"docker" "inspect" "31bb475d8e1c8e302da956bf82a95faed12ea797cac57e28cfeaef1fc4c9975b"`
[INFO] running `"docker" "rm" "-f" "31bb475d8e1c8e302da956bf82a95faed12ea797cac57e28cfeaef1fc4c9975b"`
[INFO] [stdout] 31bb475d8e1c8e302da956bf82a95faed12ea797cac57e28cfeaef1fc4c9975b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/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/wumingyue123/udp_client:/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] 3013479fbed06a125738238d6e614451de79159a7400f4b80e3f3a179453369b
[INFO] running `"docker" "start" "-a" "3013479fbed06a125738238d6e614451de79159a7400f4b80e3f3a179453369b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/client_example-0ad973d16dce21a7
[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" "3013479fbed06a125738238d6e614451de79159a7400f4b80e3f3a179453369b"`
[INFO] running `"docker" "rm" "-f" "3013479fbed06a125738238d6e614451de79159a7400f4b80e3f3a179453369b"`
[INFO] [stdout] 3013479fbed06a125738238d6e614451de79159a7400f4b80e3f3a179453369b