Dec 18 08:21:54.389 INFO checking BookOwl/trusty against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 08:21:54.389 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-2/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 08:21:54.764 INFO [stdout] 9aec4ffcc8f599d7952f4fed0d7a1a8ef73ba449f1598e96c156392a6195a667
Dec 18 08:21:54.766 INFO running `"docker" "start" "-a" "9aec4ffcc8f599d7952f4fed0d7a1a8ef73ba449f1598e96c156392a6195a667"`
Dec 18 08:21:56.164 INFO [stderr]     Checking left-pad v1.0.1
Dec 18 08:21:56.440 INFO [stderr]     Checking trusty v0.1.0 (/opt/crater/workdir)
Dec 18 08:21:56.886 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:21:56.886 INFO [stderr]   --> src/backend.rs:62:17
Dec 18 08:21:56.886 INFO [stderr]    |
Dec 18 08:21:56.886 INFO [stderr] 62 |             let mut buf = self.current_buffer_mut();
Dec 18 08:21:56.886 INFO [stderr]    |                 ----^^^
Dec 18 08:21:56.886 INFO [stderr]    |                 |
Dec 18 08:21:56.886 INFO [stderr]    |                 help: remove this `mut`
Dec 18 08:21:56.886 INFO [stderr]    |
Dec 18 08:21:56.887 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 08:21:56.887 INFO [stderr] 
Dec 18 08:21:56.887 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:21:56.887 INFO [stderr]   --> src/backend.rs:66:13
Dec 18 08:21:56.887 INFO [stderr]    |
Dec 18 08:21:56.887 INFO [stderr] 66 |         let mut cursor = self.cursor_mut();
Dec 18 08:21:56.887 INFO [stderr]    |             ----^^^^^^
Dec 18 08:21:56.887 INFO [stderr]    |             |
Dec 18 08:21:56.887 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:21:56.887 INFO [stderr] 
Dec 18 08:21:56.948 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:21:56.948 INFO [stderr]   --> src/backend.rs:62:17
Dec 18 08:21:56.948 INFO [stderr]    |
Dec 18 08:21:56.948 INFO [stderr] 62 |             let mut buf = self.current_buffer_mut();
Dec 18 08:21:56.948 INFO [stderr]    |                 ----^^^
Dec 18 08:21:56.948 INFO [stderr]    |                 |
Dec 18 08:21:56.948 INFO [stderr]    |                 help: remove this `mut`
Dec 18 08:21:56.948 INFO [stderr]    |
Dec 18 08:21:56.948 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 08:21:56.948 INFO [stderr] 
Dec 18 08:21:56.948 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:21:56.948 INFO [stderr]   --> src/backend.rs:66:13
Dec 18 08:21:56.948 INFO [stderr]    |
Dec 18 08:21:56.948 INFO [stderr] 66 |         let mut cursor = self.cursor_mut();
Dec 18 08:21:56.948 INFO [stderr]    |             ----^^^^^^
Dec 18 08:21:56.948 INFO [stderr]    |             |
Dec 18 08:21:56.948 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:21:56.948 INFO [stderr] 
Dec 18 08:21:57.493 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.38s
Dec 18 08:21:58.685 INFO running `"docker" "inspect" "9aec4ffcc8f599d7952f4fed0d7a1a8ef73ba449f1598e96c156392a6195a667"`
Dec 18 08:21:58.810 INFO running `"docker" "rm" "-f" "9aec4ffcc8f599d7952f4fed0d7a1a8ef73ba449f1598e96c156392a6195a667"`
Dec 18 08:21:58.929 INFO [stdout] 9aec4ffcc8f599d7952f4fed0d7a1a8ef73ba449f1598e96c156392a6195a667