[INFO] updating cached repository timglabisch/rust_leaking_threadpool
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/timglabisch/rust_leaking_threadpool
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/timglabisch/rust_leaking_threadpool" "work/ex/beta-1.37-6/sources/1.36.0/gh/timglabisch/rust_leaking_threadpool"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/timglabisch/rust_leaking_threadpool'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/timglabisch/rust_leaking_threadpool" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/timglabisch/rust_leaking_threadpool"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/timglabisch/rust_leaking_threadpool'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4eecd5fad12568f3bb1a1e2ee8292886422dda38
[INFO] sha for GitHub repo timglabisch/rust_leaking_threadpool: 4eecd5fad12568f3bb1a1e2ee8292886422dda38
[INFO] validating manifest of timglabisch/rust_leaking_threadpool 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 timglabisch/rust_leaking_threadpool 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 timglabisch/rust_leaking_threadpool
[INFO] finished frobbing timglabisch/rust_leaking_threadpool
[INFO] frobbed toml for timglabisch/rust_leaking_threadpool written to work/ex/beta-1.37-6/sources/1.36.0/gh/timglabisch/rust_leaking_threadpool/Cargo.toml
[INFO] started frobbing timglabisch/rust_leaking_threadpool
[INFO] finished frobbing timglabisch/rust_leaking_threadpool
[INFO] frobbed toml for timglabisch/rust_leaking_threadpool written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/timglabisch/rust_leaking_threadpool/Cargo.toml
[INFO] crate timglabisch/rust_leaking_threadpool 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/timglabisch/rust_leaking_threadpool/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 timglabisch/rust_leaking_threadpool 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-1/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/timglabisch/rust_leaking_threadpool:/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] a23eec22aa9d118807c822841c34f549261d98dedb2d86c5b42332dc7c8b6504
[INFO] running `"docker" "start" "-a" "a23eec22aa9d118807c822841c34f549261d98dedb2d86c5b42332dc7c8b6504"`
[INFO] [stderr]    Compiling threadpool_leak v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `foo`
[INFO] [stderr]   --> src/main.rs:15:17
[INFO] [stderr]    |
[INFO] [stderr] 15 |             let foo = (0..1000000).map(|_| "X").collect::<String>();
[INFO] [stderr]    |                 ^^^ help: consider prefixing with an underscore: `_foo`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.01s
[INFO] running `"docker" "inspect" "a23eec22aa9d118807c822841c34f549261d98dedb2d86c5b42332dc7c8b6504"`
[INFO] running `"docker" "rm" "-f" "a23eec22aa9d118807c822841c34f549261d98dedb2d86c5b42332dc7c8b6504"`
[INFO] [stdout] a23eec22aa9d118807c822841c34f549261d98dedb2d86c5b42332dc7c8b6504
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/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/timglabisch/rust_leaking_threadpool:/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] 3d2429d98476f721e194c0a3d0a91c20aab581ebd9a33b18fa751baa293db554
[INFO] running `"docker" "start" "-a" "3d2429d98476f721e194c0a3d0a91c20aab581ebd9a33b18fa751baa293db554"`
[INFO] [stderr]    Compiling threadpool_leak v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `foo`
[INFO] [stderr]   --> src/main.rs:15:17
[INFO] [stderr]    |
[INFO] [stderr] 15 |             let foo = (0..1000000).map(|_| "X").collect::<String>();
[INFO] [stderr]    |                 ^^^ help: consider prefixing with an underscore: `_foo`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `"docker" "inspect" "3d2429d98476f721e194c0a3d0a91c20aab581ebd9a33b18fa751baa293db554"`
[INFO] running `"docker" "rm" "-f" "3d2429d98476f721e194c0a3d0a91c20aab581ebd9a33b18fa751baa293db554"`
[INFO] [stdout] 3d2429d98476f721e194c0a3d0a91c20aab581ebd9a33b18fa751baa293db554
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/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/timglabisch/rust_leaking_threadpool:/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] da07d1c1c1af023dbb4bc8f49c5671cbf0947c8cd09eb9fefcf59becee48c8a8
[INFO] running `"docker" "start" "-a" "da07d1c1c1af023dbb4bc8f49c5671cbf0947c8cd09eb9fefcf59becee48c8a8"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/threadpool_leak-3660fcb3c799adbd
[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" "da07d1c1c1af023dbb4bc8f49c5671cbf0947c8cd09eb9fefcf59becee48c8a8"`
[INFO] running `"docker" "rm" "-f" "da07d1c1c1af023dbb4bc8f49c5671cbf0947c8cd09eb9fefcf59becee48c8a8"`
[INFO] [stdout] da07d1c1c1af023dbb4bc8f49c5671cbf0947c8cd09eb9fefcf59becee48c8a8