[INFO] crate listenfd 0.3.3 is already in cache
[INFO] extracting crate listenfd 0.3.3 into work/ex/beta-1.38-1/sources/1.37.0/reg/listenfd/0.3.3
[INFO] extracting crate listenfd 0.3.3 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/listenfd/0.3.3
[INFO] validating manifest of listenfd-0.3.3 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 listenfd-0.3.3 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 listenfd-0.3.3
[INFO] finished frobbing listenfd-0.3.3
[INFO] frobbed toml for listenfd-0.3.3 written to work/ex/beta-1.38-1/sources/1.37.0/reg/listenfd/0.3.3/Cargo.toml
[INFO] started frobbing listenfd-0.3.3
[INFO] finished frobbing listenfd-0.3.3
[INFO] frobbed toml for listenfd-0.3.3 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/listenfd/0.3.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 listenfd-0.3.3 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/listenfd/0.3.3:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 119164d107dc9168cbf05ee30c6b88143dd8865664910dd67f0c2edf04ce8ff9
[INFO] running `"docker" "start" "-a" "119164d107dc9168cbf05ee30c6b88143dd8865664910dd67f0c2edf04ce8ff9"`
[INFO] [stderr]    Compiling listenfd v0.3.3 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/manager.rs:54:18
[INFO] [stderr]    |
[INFO] [stderr] 54 |             Some(mut bucket) => bucket,
[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]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `"docker" "inspect" "119164d107dc9168cbf05ee30c6b88143dd8865664910dd67f0c2edf04ce8ff9"`
[INFO] running `"docker" "rm" "-f" "119164d107dc9168cbf05ee30c6b88143dd8865664910dd67f0c2edf04ce8ff9"`
[INFO] [stdout] 119164d107dc9168cbf05ee30c6b88143dd8865664910dd67f0c2edf04ce8ff9
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/listenfd/0.3.3:/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 31474284cc57fc0cc8ba045c6ece0f7c2859f4c993733042832117c5910846c0
[INFO] running `"docker" "start" "-a" "31474284cc57fc0cc8ba045c6ece0f7c2859f4c993733042832117c5910846c0"`
[INFO] [stderr]    Compiling listenfd v0.3.3 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/manager.rs:54:18
[INFO] [stderr]    |
[INFO] [stderr] 54 |             Some(mut bucket) => bucket,
[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]     Finished dev [unoptimized + debuginfo] target(s) in 0.69s
[INFO] running `"docker" "inspect" "31474284cc57fc0cc8ba045c6ece0f7c2859f4c993733042832117c5910846c0"`
[INFO] running `"docker" "rm" "-f" "31474284cc57fc0cc8ba045c6ece0f7c2859f4c993733042832117c5910846c0"`
[INFO] [stdout] 31474284cc57fc0cc8ba045c6ece0f7c2859f4c993733042832117c5910846c0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/listenfd/0.3.3:/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 43adb3cba9b66bea2ae05bac51ad5fd601996f9b4bf5c210ad7e8be153804643
[INFO] running `"docker" "start" "-a" "43adb3cba9b66bea2ae05bac51ad5fd601996f9b4bf5c210ad7e8be153804643"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/listenfd-46e027f19f30ad07
[INFO] [stderr]    Doc-tests listenfd
[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 1 test
[INFO] [stdout] test src/lib.rs -  (line 19) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "43adb3cba9b66bea2ae05bac51ad5fd601996f9b4bf5c210ad7e8be153804643"`
[INFO] running `"docker" "rm" "-f" "43adb3cba9b66bea2ae05bac51ad5fd601996f9b4bf5c210ad7e8be153804643"`
[INFO] [stdout] 43adb3cba9b66bea2ae05bac51ad5fd601996f9b4bf5c210ad7e8be153804643