Dec 18 14:47:44.228 INFO checking jens-0.4.2 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 14:47:44.229 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-7/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/jens/0.4.2:/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 18 14:47:44.643 INFO [stdout] 70cc424577330b426169ae94dc8f0b0bb5bbd244598aa8d39321c9b90f2ef9c6
Dec 18 14:47:44.648 INFO running `"docker" "start" "-a" "70cc424577330b426169ae94dc8f0b0bb5bbd244598aa8d39321c9b90f2ef9c6"`
Dec 18 14:47:46.454 INFO [stderr]     Checking jens v0.4.2 (/opt/crater/workdir)
Dec 18 14:47:47.127 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 14:47:47.127 INFO [stderr]    --> src/block.rs:129:17
Dec 18 14:47:47.127 INFO [stderr]     |
Dec 18 14:47:47.127 INFO [stderr] 129 |                 write!(f, "\n{}", prefix);
Dec 18 14:47:47.127 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 14:47:47.127 INFO [stderr]     |
Dec 18 14:47:47.127 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 18 14:47:47.127 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 14:47:47.127 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 14:47:47.127 INFO [stderr] 
Dec 18 14:47:47.160 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 14:47:47.160 INFO [stderr]    --> src/block.rs:129:17
Dec 18 14:47:47.160 INFO [stderr]     |
Dec 18 14:47:47.160 INFO [stderr] 129 |                 write!(f, "\n{}", prefix);
Dec 18 14:47:47.160 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 14:47:47.160 INFO [stderr]     |
Dec 18 14:47:47.160 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 18 14:47:47.160 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 14:47:47.160 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 14:47:47.160 INFO [stderr] 
Dec 18 14:47:47.161 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 14:47:47.161 INFO [stderr]    --> src/block.rs:257:9
Dec 18 14:47:47.161 INFO [stderr]     |
Dec 18 14:47:47.161 INFO [stderr] 257 |         write!(&mut s, "{}", function);
Dec 18 14:47:47.161 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 14:47:47.161 INFO [stderr]     |
Dec 18 14:47:47.161 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 14:47:47.161 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 14:47:47.161 INFO [stderr] 
Dec 18 14:47:47.662 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.23s
Dec 18 14:47:48.206 INFO running `"docker" "inspect" "70cc424577330b426169ae94dc8f0b0bb5bbd244598aa8d39321c9b90f2ef9c6"`
Dec 18 14:47:48.366 INFO running `"docker" "rm" "-f" "70cc424577330b426169ae94dc8f0b0bb5bbd244598aa8d39321c9b90f2ef9c6"`
Dec 18 14:47:48.563 INFO [stdout] 70cc424577330b426169ae94dc8f0b0bb5bbd244598aa8d39321c9b90f2ef9c6