Dec 19 07:24:17.617 INFO checking tercen/rustson against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 07:24:17.617 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-0/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 07:24:18.108 INFO [stdout] dd65abc06b10a8a61a8349066813388a0bbc9520f6b1e724c9af4f37d2e8cfec
Dec 19 07:24:18.112 INFO running `"docker" "start" "-a" "dd65abc06b10a8a61a8349066813388a0bbc9520f6b1e724c9af4f37d2e8cfec"`
Dec 19 07:24:20.092 INFO [stderr]     Checking rustson v0.1.0 (/opt/crater/workdir)
Dec 19 07:24:20.383 INFO [stderr] warning: unused import: `std::fs::File`
Dec 19 07:24:20.383 INFO [stderr]    --> src/lib.rs:456:9
Dec 19 07:24:20.384 INFO [stderr]     |
Dec 19 07:24:20.384 INFO [stderr] 456 |     use std::fs::File;
Dec 19 07:24:20.384 INFO [stderr]     |         ^^^^^^^^^^^^^
Dec 19 07:24:20.385 INFO [stderr]     |
Dec 19 07:24:20.385 INFO [stderr]     = note: #[warn(unused_imports)] on by default
Dec 19 07:24:20.385 INFO [stderr] 
Dec 19 07:24:20.385 INFO [stderr] warning: unused import: `std::io::prelude::*`
Dec 19 07:24:20.385 INFO [stderr]    --> src/lib.rs:457:9
Dec 19 07:24:20.385 INFO [stderr]     |
Dec 19 07:24:20.385 INFO [stderr] 457 |     use std::io::prelude::*;
Dec 19 07:24:20.385 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^
Dec 19 07:24:20.385 INFO [stderr] 
Dec 19 07:24:20.736 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 07:24:20.736 INFO [stderr]    --> src/lib.rs:133:17
Dec 19 07:24:20.736 INFO [stderr]     |
Dec 19 07:24:20.736 INFO [stderr] 133 |                 add_object(v, buf);
Dec 19 07:24:20.736 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^
Dec 19 07:24:20.736 INFO [stderr]     |
Dec 19 07:24:20.736 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 19 07:24:20.736 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 07:24:20.736 INFO [stderr] 
Dec 19 07:24:20.844 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 07:24:20.844 INFO [stderr]    --> src/lib.rs:133:17
Dec 19 07:24:20.844 INFO [stderr]     |
Dec 19 07:24:20.844 INFO [stderr] 133 |                 add_object(v, buf);
Dec 19 07:24:20.844 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^
Dec 19 07:24:20.844 INFO [stderr]     |
Dec 19 07:24:20.844 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 19 07:24:20.844 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 07:24:20.844 INFO [stderr] 
Dec 19 07:24:20.888 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.84s
Dec 19 07:24:21.854 INFO running `"docker" "inspect" "dd65abc06b10a8a61a8349066813388a0bbc9520f6b1e724c9af4f37d2e8cfec"`
Dec 19 07:24:22.228 INFO running `"docker" "rm" "-f" "dd65abc06b10a8a61a8349066813388a0bbc9520f6b1e724c9af4f37d2e8cfec"`
Dec 19 07:24:22.607 INFO [stdout] dd65abc06b10a8a61a8349066813388a0bbc9520f6b1e724c9af4f37d2e8cfec