[INFO] updating cached repository furuhama/epoll
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/furuhama/epoll
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/furuhama/epoll" "work/ex/beta-1.38-1/sources/1.37.0/gh/furuhama/epoll"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/furuhama/epoll'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/furuhama/epoll" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/furuhama/epoll"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/furuhama/epoll'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d0424b0a047f489a7d5d7dcea20ea2996980d372
[INFO] sha for GitHub repo furuhama/epoll: d0424b0a047f489a7d5d7dcea20ea2996980d372
[INFO] validating manifest of furuhama/epoll 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 furuhama/epoll 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 furuhama/epoll
[INFO] finished frobbing furuhama/epoll
[INFO] frobbed toml for furuhama/epoll written to work/ex/beta-1.38-1/sources/1.37.0/gh/furuhama/epoll/Cargo.toml
[INFO] started frobbing furuhama/epoll
[INFO] finished frobbing furuhama/epoll
[INFO] frobbed toml for furuhama/epoll written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/furuhama/epoll/Cargo.toml
[INFO] crate furuhama/epoll 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 furuhama/epoll 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/furuhama/epoll:/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] 96e6fcdbf7e89087801acafb649630577dcce2b13f2b7a9cf99cb824073b710c
[INFO] running `"docker" "start" "-a" "96e6fcdbf7e89087801acafb649630577dcce2b13f2b7a9cf99cb824073b710c"`
[INFO] [stderr]    Compiling nix v0.11.0
[INFO] [stderr]    Compiling epoll v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     epoll::epoll();
[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 7.54s
[INFO] running `"docker" "inspect" "96e6fcdbf7e89087801acafb649630577dcce2b13f2b7a9cf99cb824073b710c"`
[INFO] running `"docker" "rm" "-f" "96e6fcdbf7e89087801acafb649630577dcce2b13f2b7a9cf99cb824073b710c"`
[INFO] [stdout] 96e6fcdbf7e89087801acafb649630577dcce2b13f2b7a9cf99cb824073b710c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/furuhama/epoll:/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] 6b6c4d8779404e1076ade49541f80151a18693270f212f68df84ecd45272c1b2
[INFO] running `"docker" "start" "-a" "6b6c4d8779404e1076ade49541f80151a18693270f212f68df84ecd45272c1b2"`
[INFO] [stderr]    Compiling epoll v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     epoll::epoll();
[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 0.66s
[INFO] running `"docker" "inspect" "6b6c4d8779404e1076ade49541f80151a18693270f212f68df84ecd45272c1b2"`
[INFO] running `"docker" "rm" "-f" "6b6c4d8779404e1076ade49541f80151a18693270f212f68df84ecd45272c1b2"`
[INFO] [stdout] 6b6c4d8779404e1076ade49541f80151a18693270f212f68df84ecd45272c1b2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/furuhama/epoll:/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] 012cd7cbbe80285bc37694a5cb7b0e32e0c5f3d31b7d3a5a39b707b2f60ea865
[INFO] running `"docker" "start" "-a" "012cd7cbbe80285bc37694a5cb7b0e32e0c5f3d31b7d3a5a39b707b2f60ea865"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/epoll-f7bdbd3b8efa3cc0
[INFO] [stderr]      Running /opt/crater/target/debug/deps/epoll-7d8dff52f07801ed
[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] [stderr]    Doc-tests epoll
[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] [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" "012cd7cbbe80285bc37694a5cb7b0e32e0c5f3d31b7d3a5a39b707b2f60ea865"`
[INFO] running `"docker" "rm" "-f" "012cd7cbbe80285bc37694a5cb7b0e32e0c5f3d31b7d3a5a39b707b2f60ea865"`
[INFO] [stdout] 012cd7cbbe80285bc37694a5cb7b0e32e0c5f3d31b7d3a5a39b707b2f60ea865