[INFO] updating cached repository Kriegslustig/ping-pong-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Kriegslustig/ping-pong-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Kriegslustig/ping-pong-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/Kriegslustig/ping-pong-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Kriegslustig/ping-pong-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Kriegslustig/ping-pong-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Kriegslustig/ping-pong-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Kriegslustig/ping-pong-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5485b857face9016582831af832184b1d07608d5
[INFO] sha for GitHub repo Kriegslustig/ping-pong-rs: 5485b857face9016582831af832184b1d07608d5
[INFO] validating manifest of Kriegslustig/ping-pong-rs 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 Kriegslustig/ping-pong-rs 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 Kriegslustig/ping-pong-rs
[INFO] finished frobbing Kriegslustig/ping-pong-rs
[INFO] frobbed toml for Kriegslustig/ping-pong-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/Kriegslustig/ping-pong-rs/Cargo.toml
[INFO] started frobbing Kriegslustig/ping-pong-rs
[INFO] finished frobbing Kriegslustig/ping-pong-rs
[INFO] frobbed toml for Kriegslustig/ping-pong-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Kriegslustig/ping-pong-rs/Cargo.toml
[INFO] crate Kriegslustig/ping-pong-rs 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 Kriegslustig/ping-pong-rs 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Kriegslustig/ping-pong-rs:/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] 0e16675072474db7d4a1dd14a7672e4ddfe28f599f8103071b35c1da83f73a23
[INFO] running `"docker" "start" "-a" "0e16675072474db7d4a1dd14a7672e4ddfe28f599f8103071b35c1da83f73a23"`
[INFO] [stderr]    Compiling ping-pong v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:152:17
[INFO] [stderr]     |
[INFO] [stderr] 152 |                 socket.send(&bye);
[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 1.27s
[INFO] running `"docker" "inspect" "0e16675072474db7d4a1dd14a7672e4ddfe28f599f8103071b35c1da83f73a23"`
[INFO] running `"docker" "rm" "-f" "0e16675072474db7d4a1dd14a7672e4ddfe28f599f8103071b35c1da83f73a23"`
[INFO] [stdout] 0e16675072474db7d4a1dd14a7672e4ddfe28f599f8103071b35c1da83f73a23
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Kriegslustig/ping-pong-rs:/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] 2a633e6d2cbb59c030ff5e85c28d248dabf6a3a63dc6a6ad1e4e1e91ea370c94
[INFO] running `"docker" "start" "-a" "2a633e6d2cbb59c030ff5e85c28d248dabf6a3a63dc6a6ad1e4e1e91ea370c94"`
[INFO] [stderr]    Compiling ping-pong v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:152:17
[INFO] [stderr]     |
[INFO] [stderr] 152 |                 socket.send(&bye);
[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 0.76s
[INFO] running `"docker" "inspect" "2a633e6d2cbb59c030ff5e85c28d248dabf6a3a63dc6a6ad1e4e1e91ea370c94"`
[INFO] running `"docker" "rm" "-f" "2a633e6d2cbb59c030ff5e85c28d248dabf6a3a63dc6a6ad1e4e1e91ea370c94"`
[INFO] [stdout] 2a633e6d2cbb59c030ff5e85c28d248dabf6a3a63dc6a6ad1e4e1e91ea370c94
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Kriegslustig/ping-pong-rs:/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] 1d83eb9163a48dfb6c6284143500962b6c50520c4c45793a60c3acce8be6d23d
[INFO] running `"docker" "start" "-a" "1d83eb9163a48dfb6c6284143500962b6c50520c4c45793a60c3acce8be6d23d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/ping_pong-87df8bd2d23ceadc
[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" "1d83eb9163a48dfb6c6284143500962b6c50520c4c45793a60c3acce8be6d23d"`
[INFO] running `"docker" "rm" "-f" "1d83eb9163a48dfb6c6284143500962b6c50520c4c45793a60c3acce8be6d23d"`
[INFO] [stdout] 1d83eb9163a48dfb6c6284143500962b6c50520c4c45793a60c3acce8be6d23d