Dec 17 13:55:20.185 INFO checking tercen/rustson against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 17 13:55:20.185 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-3/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/gh/tercen/rustson:/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 13:55:20.747 INFO [stdout] 5ae03ac2564afb018b2bd28adcf78bd26b9fc015e7330712392e54746c478095
Dec 17 13:55:20.750 INFO running `"docker" "start" "-a" "5ae03ac2564afb018b2bd28adcf78bd26b9fc015e7330712392e54746c478095"`
Dec 17 13:55:23.420 INFO [stderr]     Checking bytes v0.4.6
Dec 17 13:55:24.324 INFO [stderr]     Checking rustson v0.1.0 (/opt/crater/workdir)
Dec 17 13:55:24.528 INFO [stderr] warning: unused import: `std::fs::File`
Dec 17 13:55:24.528 INFO [stderr]    --> src/lib.rs:456:9
Dec 17 13:55:24.528 INFO [stderr]     |
Dec 17 13:55:24.528 INFO [stderr] 456 |     use std::fs::File;
Dec 17 13:55:24.528 INFO [stderr]     |         ^^^^^^^^^^^^^
Dec 17 13:55:24.528 INFO [stderr]     |
Dec 17 13:55:24.528 INFO [stderr]     = note: #[warn(unused_imports)] on by default
Dec 17 13:55:24.528 INFO [stderr] 
Dec 17 13:55:24.528 INFO [stderr] warning: unused import: `std::io::prelude::*`
Dec 17 13:55:24.528 INFO [stderr]    --> src/lib.rs:457:9
Dec 17 13:55:24.528 INFO [stderr]     |
Dec 17 13:55:24.528 INFO [stderr] 457 |     use std::io::prelude::*;
Dec 17 13:55:24.528 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^
Dec 17 13:55:24.528 INFO [stderr] 
Dec 17 13:55:25.103 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 13:55:25.103 INFO [stderr]    --> src/lib.rs:133:17
Dec 17 13:55:25.103 INFO [stderr]     |
Dec 17 13:55:25.103 INFO [stderr] 133 |                 add_object(v, buf);
Dec 17 13:55:25.103 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^
Dec 17 13:55:25.103 INFO [stderr]     |
Dec 17 13:55:25.103 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 17 13:55:25.103 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 13:55:25.103 INFO [stderr] 
Dec 17 13:55:25.103 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 13:55:25.116 INFO [stderr]    --> src/lib.rs:133:17
Dec 17 13:55:25.116 INFO [stderr]     |
Dec 17 13:55:25.116 INFO [stderr] 133 |                 add_object(v, buf);
Dec 17 13:55:25.116 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^
Dec 17 13:55:25.116 INFO [stderr]     |
Dec 17 13:55:25.116 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 17 13:55:25.116 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 13:55:25.116 INFO [stderr] 
Dec 17 13:55:25.165 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.83s
Dec 17 13:55:26.228 INFO running `"docker" "inspect" "5ae03ac2564afb018b2bd28adcf78bd26b9fc015e7330712392e54746c478095"`
Dec 17 13:55:26.626 INFO running `"docker" "rm" "-f" "5ae03ac2564afb018b2bd28adcf78bd26b9fc015e7330712392e54746c478095"`
Dec 17 13:55:26.980 INFO [stdout] 5ae03ac2564afb018b2bd28adcf78bd26b9fc015e7330712392e54746c478095