Dec 17 19:33:14.261 INFO checking mitsuhiko/systemfd against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 17 19:33:14.261 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-2/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/gh/mitsuhiko/systemfd:/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=forbid" "-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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 19:33:14.459 INFO [stdout] 35ccf6c73ab16cd50d592b8dc710ec4f5a474dd17c8e47a44863358b2083d817
Dec 17 19:33:14.464 INFO running `"docker" "start" "-a" "35ccf6c73ab16cd50d592b8dc710ec4f5a474dd17c8e47a44863358b2083d817"`
Dec 17 19:33:15.114 INFO [stderr]     Checking termios v0.2.2
Dec 17 19:33:15.116 INFO [stderr]     Checking clicolors-control v0.2.0
Dec 17 19:33:15.116 INFO [stderr]     Checking bytes v0.4.7
Dec 17 19:33:15.116 INFO [stderr]     Checking regex v1.0.0
Dec 17 19:33:15.576 INFO [stderr]     Checking console v0.6.1
Dec 17 19:33:16.670 INFO [stderr]     Checking nix v0.10.0
Dec 17 19:33:21.864 INFO [stderr]     Checking systemfd v0.3.0 (/opt/crater/workdir)
Dec 17 19:33:22.488 INFO [stderr] warning: struct is never constructed: `QuietExit`
Dec 17 19:33:22.488 INFO [stderr]  --> src/utils.rs:5:1
Dec 17 19:33:22.488 INFO [stderr]   |
Dec 17 19:33:22.488 INFO [stderr] 5 | pub struct QuietExit(pub i32);
Dec 17 19:33:22.488 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 19:33:22.488 INFO [stderr]   |
Dec 17 19:33:22.488 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 17 19:33:22.488 INFO [stderr] 
Dec 17 19:33:22.488 INFO [stderr] warning: struct is never constructed: `QuietExit`
Dec 17 19:33:22.488 INFO [stderr]  --> src/utils.rs:5:1
Dec 17 19:33:22.488 INFO [stderr]   |
Dec 17 19:33:22.488 INFO [stderr] 5 | pub struct QuietExit(pub i32);
Dec 17 19:33:22.488 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 19:33:22.488 INFO [stderr]   |
Dec 17 19:33:22.488 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 17 19:33:22.488 INFO [stderr] 
Dec 17 19:33:22.490 INFO [stderr] warning: unused attribute
Dec 17 19:33:22.490 INFO [stderr]  --> src/utils.rs:4:1
Dec 17 19:33:22.490 INFO [stderr]   |
Dec 17 19:33:22.490 INFO [stderr] 4 | #[ignore(dead_code)]
Dec 17 19:33:22.490 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^
Dec 17 19:33:22.490 INFO [stderr]   |
Dec 17 19:33:22.490 INFO [stderr]   = note: #[warn(unused_attributes)] on by default
Dec 17 19:33:22.490 INFO [stderr] 
Dec 17 19:33:22.490 INFO [stderr] warning: unused attribute
Dec 17 19:33:22.490 INFO [stderr]  --> src/utils.rs:4:1
Dec 17 19:33:22.490 INFO [stderr]   |
Dec 17 19:33:22.490 INFO [stderr] 4 | #[ignore(dead_code)]
Dec 17 19:33:22.490 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^
Dec 17 19:33:22.490 INFO [stderr]   |
Dec 17 19:33:22.490 INFO [stderr]   = note: #[warn(unused_attributes)] on by default
Dec 17 19:33:22.490 INFO [stderr] 
Dec 17 19:33:22.526 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.54s
Dec 17 19:33:22.908 INFO running `"docker" "inspect" "35ccf6c73ab16cd50d592b8dc710ec4f5a474dd17c8e47a44863358b2083d817"`
Dec 17 19:33:23.026 INFO running `"docker" "rm" "-f" "35ccf6c73ab16cd50d592b8dc710ec4f5a474dd17c8e47a44863358b2083d817"`
Dec 17 19:33:23.140 INFO [stdout] 35ccf6c73ab16cd50d592b8dc710ec4f5a474dd17c8e47a44863358b2083d817