Dec 18 08:21:54.707 INFO checking BookOwl/trusty against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 08:21:54.707 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/BookOwl/trusty:/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 08:21:55.084 INFO [stdout] 1ef489a8b128e4c313bf12228264d091feb5081d2e9656cfa2ef95c95a13c02e
Dec 18 08:21:55.090 INFO running `"docker" "start" "-a" "1ef489a8b128e4c313bf12228264d091feb5081d2e9656cfa2ef95c95a13c02e"`
Dec 18 08:21:56.615 INFO [stderr]     Checking left-pad v1.0.1
Dec 18 08:21:56.620 INFO [stderr]     Checking termion v1.1.4
Dec 18 08:21:57.616 INFO [stderr]     Checking trusty v0.1.0 (/opt/crater/workdir)
Dec 18 08:21:58.088 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:21:58.088 INFO [stderr]   --> src/backend.rs:62:17
Dec 18 08:21:58.088 INFO [stderr]    |
Dec 18 08:21:58.088 INFO [stderr] 62 |             let mut buf = self.current_buffer_mut();
Dec 18 08:21:58.088 INFO [stderr]    |                 ----^^^
Dec 18 08:21:58.088 INFO [stderr]    |                 |
Dec 18 08:21:58.088 INFO [stderr]    |                 help: remove this `mut`
Dec 18 08:21:58.088 INFO [stderr]    |
Dec 18 08:21:58.088 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 08:21:58.088 INFO [stderr] 
Dec 18 08:21:58.088 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:21:58.088 INFO [stderr]   --> src/backend.rs:66:13
Dec 18 08:21:58.088 INFO [stderr]    |
Dec 18 08:21:58.088 INFO [stderr] 66 |         let mut cursor = self.cursor_mut();
Dec 18 08:21:58.088 INFO [stderr]    |             ----^^^^^^
Dec 18 08:21:58.088 INFO [stderr]    |             |
Dec 18 08:21:58.089 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:21:58.089 INFO [stderr] 
Dec 18 08:21:58.089 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:21:58.089 INFO [stderr]   --> src/backend.rs:62:17
Dec 18 08:21:58.089 INFO [stderr]    |
Dec 18 08:21:58.089 INFO [stderr] 62 |             let mut buf = self.current_buffer_mut();
Dec 18 08:21:58.089 INFO [stderr]    |                 ----^^^
Dec 18 08:21:58.089 INFO [stderr]    |                 |
Dec 18 08:21:58.089 INFO [stderr]    |                 help: remove this `mut`
Dec 18 08:21:58.089 INFO [stderr]    |
Dec 18 08:21:58.089 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 08:21:58.089 INFO [stderr] 
Dec 18 08:21:58.089 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:21:58.089 INFO [stderr]   --> src/backend.rs:66:13
Dec 18 08:21:58.089 INFO [stderr]    |
Dec 18 08:21:58.089 INFO [stderr] 66 |         let mut cursor = self.cursor_mut();
Dec 18 08:21:58.089 INFO [stderr]    |             ----^^^^^^
Dec 18 08:21:58.089 INFO [stderr]    |             |
Dec 18 08:21:58.089 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:21:58.089 INFO [stderr] 
Dec 18 08:21:58.614 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.04s
Dec 18 08:21:59.066 INFO running `"docker" "inspect" "1ef489a8b128e4c313bf12228264d091feb5081d2e9656cfa2ef95c95a13c02e"`
Dec 18 08:21:59.190 INFO running `"docker" "rm" "-f" "1ef489a8b128e4c313bf12228264d091feb5081d2e9656cfa2ef95c95a13c02e"`
Dec 18 08:21:59.300 INFO [stdout] 1ef489a8b128e4c313bf12228264d091feb5081d2e9656cfa2ef95c95a13c02e