Dec 12 03:41:55.463 INFO checking BookOwl/trusty against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 03:41:55.463 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-3/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +3a75e80557a103497cffbcab395a2f37061a77ea-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 12 03:41:55.732 INFO [stdout] 4e1ee32d2a7118642791500c9178831ca42b1158f5a2669ee5a76f9088f1f1ec
Dec 12 03:41:55.740 INFO running `"docker" "start" "-a" "4e1ee32d2a7118642791500c9178831ca42b1158f5a2669ee5a76f9088f1f1ec"`
Dec 12 03:41:56.811 INFO [stderr] usermod: no changes
Dec 12 03:41:56.876 INFO [stderr]     Checking left-pad v1.0.1
Dec 12 03:41:57.303 INFO [stderr]     Checking trusty v0.1.0 (/source)
Dec 12 03:41:58.028 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:41:58.028 INFO [stderr]   --> src/backend.rs:62:17
Dec 12 03:41:58.028 INFO [stderr]    |
Dec 12 03:41:58.028 INFO [stderr] 62 |             let mut buf = self.current_buffer_mut();
Dec 12 03:41:58.028 INFO [stderr]    |                 ----^^^
Dec 12 03:41:58.028 INFO [stderr]    |                 |
Dec 12 03:41:58.028 INFO [stderr]    |                 help: remove this `mut`
Dec 12 03:41:58.028 INFO [stderr]    |
Dec 12 03:41:58.028 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 03:41:58.028 INFO [stderr] 
Dec 12 03:41:58.028 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:41:58.028 INFO [stderr]   --> src/backend.rs:66:13
Dec 12 03:41:58.028 INFO [stderr]    |
Dec 12 03:41:58.028 INFO [stderr] 66 |         let mut cursor = self.cursor_mut();
Dec 12 03:41:58.028 INFO [stderr]    |             ----^^^^^^
Dec 12 03:41:58.028 INFO [stderr]    |             |
Dec 12 03:41:58.028 INFO [stderr]    |             help: remove this `mut`
Dec 12 03:41:58.028 INFO [stderr] 
Dec 12 03:41:58.108 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:41:58.108 INFO [stderr]   --> src/backend.rs:62:17
Dec 12 03:41:58.108 INFO [stderr]    |
Dec 12 03:41:58.108 INFO [stderr] 62 |             let mut buf = self.current_buffer_mut();
Dec 12 03:41:58.108 INFO [stderr]    |                 ----^^^
Dec 12 03:41:58.108 INFO [stderr]    |                 |
Dec 12 03:41:58.108 INFO [stderr]    |                 help: remove this `mut`
Dec 12 03:41:58.108 INFO [stderr]    |
Dec 12 03:41:58.108 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 03:41:58.108 INFO [stderr] 
Dec 12 03:41:58.108 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:41:58.108 INFO [stderr]   --> src/backend.rs:66:13
Dec 12 03:41:58.108 INFO [stderr]    |
Dec 12 03:41:58.108 INFO [stderr] 66 |         let mut cursor = self.cursor_mut();
Dec 12 03:41:58.108 INFO [stderr]    |             ----^^^^^^
Dec 12 03:41:58.108 INFO [stderr]    |             |
Dec 12 03:41:58.108 INFO [stderr]    |             help: remove this `mut`
Dec 12 03:41:58.108 INFO [stderr] 
Dec 12 03:41:59.100 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.26s
Dec 12 03:41:59.103 INFO [stderr] su: No module specific data is present
Dec 12 03:41:59.443 INFO running `"docker" "inspect" "4e1ee32d2a7118642791500c9178831ca42b1158f5a2669ee5a76f9088f1f1ec"`
Dec 12 03:41:59.626 INFO running `"docker" "rm" "-f" "4e1ee32d2a7118642791500c9178831ca42b1158f5a2669ee5a76f9088f1f1ec"`
Dec 12 03:41:59.780 INFO [stdout] 4e1ee32d2a7118642791500c9178831ca42b1158f5a2669ee5a76f9088f1f1ec