[INFO] updating cached repository suttung3r/rustechoserver
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/suttung3r/rustechoserver
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/suttung3r/rustechoserver" "work/ex/beta-1.38-1/sources/1.37.0/gh/suttung3r/rustechoserver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/suttung3r/rustechoserver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/suttung3r/rustechoserver" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/suttung3r/rustechoserver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/suttung3r/rustechoserver'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9ca492e70e3d465812bf595b8ea3d864398b4c78
[INFO] sha for GitHub repo suttung3r/rustechoserver: 9ca492e70e3d465812bf595b8ea3d864398b4c78
[INFO] validating manifest of suttung3r/rustechoserver 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 suttung3r/rustechoserver 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 suttung3r/rustechoserver
[INFO] finished frobbing suttung3r/rustechoserver
[INFO] frobbed toml for suttung3r/rustechoserver written to work/ex/beta-1.38-1/sources/1.37.0/gh/suttung3r/rustechoserver/Cargo.toml
[INFO] started frobbing suttung3r/rustechoserver
[INFO] finished frobbing suttung3r/rustechoserver
[INFO] frobbed toml for suttung3r/rustechoserver written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/suttung3r/rustechoserver/Cargo.toml
[INFO] crate suttung3r/rustechoserver 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 suttung3r/rustechoserver 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/suttung3r/rustechoserver:/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] d7e2d189d61b5fbc6c00f7e6cb1b594fe31b9723ca43f28604dd80c3657faec3
[INFO] running `"docker" "start" "-a" "d7e2d189d61b5fbc6c00f7e6cb1b594fe31b9723ca43f28604dd80c3657faec3"`
[INFO] [stderr]    Compiling socket_test v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `res`
[INFO] [stderr]   --> src/main.rs:42:14
[INFO] [stderr]    |
[INFO] [stderr] 42 |           Ok(res) => {}
[INFO] [stderr]    |              ^^^ help: consider prefixing with an underscore: `_res`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.11s
[INFO] running `"docker" "inspect" "d7e2d189d61b5fbc6c00f7e6cb1b594fe31b9723ca43f28604dd80c3657faec3"`
[INFO] running `"docker" "rm" "-f" "d7e2d189d61b5fbc6c00f7e6cb1b594fe31b9723ca43f28604dd80c3657faec3"`
[INFO] [stdout] d7e2d189d61b5fbc6c00f7e6cb1b594fe31b9723ca43f28604dd80c3657faec3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/suttung3r/rustechoserver:/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] 267583516eba3f9ef726ef24f89d6eb2de87bae3ed539cb6723ac9a1dff57a6d
[INFO] running `"docker" "start" "-a" "267583516eba3f9ef726ef24f89d6eb2de87bae3ed539cb6723ac9a1dff57a6d"`
[INFO] [stderr]    Compiling socket_test v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `res`
[INFO] [stderr]   --> src/main.rs:42:14
[INFO] [stderr]    |
[INFO] [stderr] 42 |           Ok(res) => {}
[INFO] [stderr]    |              ^^^ help: consider prefixing with an underscore: `_res`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.64s
[INFO] running `"docker" "inspect" "267583516eba3f9ef726ef24f89d6eb2de87bae3ed539cb6723ac9a1dff57a6d"`
[INFO] running `"docker" "rm" "-f" "267583516eba3f9ef726ef24f89d6eb2de87bae3ed539cb6723ac9a1dff57a6d"`
[INFO] [stdout] 267583516eba3f9ef726ef24f89d6eb2de87bae3ed539cb6723ac9a1dff57a6d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/suttung3r/rustechoserver:/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] 9459ce9a0657be567bce1e21bfdffe6815f86aa9a9a1a1657372fee0103c460d
[INFO] running `"docker" "start" "-a" "9459ce9a0657be567bce1e21bfdffe6815f86aa9a9a1a1657372fee0103c460d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/socket_test-cfe7d08a7ca3122f
[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" "9459ce9a0657be567bce1e21bfdffe6815f86aa9a9a1a1657372fee0103c460d"`
[INFO] running `"docker" "rm" "-f" "9459ce9a0657be567bce1e21bfdffe6815f86aa9a9a1a1657372fee0103c460d"`
[INFO] [stdout] 9459ce9a0657be567bce1e21bfdffe6815f86aa9a9a1a1657372fee0103c460d