Dec 12 12:38:36.860 INFO checking jconfig-0.1.0 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 12:38:36.860 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-1/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/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 12:38:37.278 INFO [stdout] c7f17a36c36023ecf83ad08aae8394765af6b420ed30c6cc8d19cb9904c7c8a7
Dec 12 12:38:37.280 INFO running `"docker" "start" "-a" "c7f17a36c36023ecf83ad08aae8394765af6b420ed30c6cc8d19cb9904c7c8a7"`
Dec 12 12:38:39.476 INFO [stderr] usermod: no changes
Dec 12 12:38:39.556 INFO [stderr]     Checking jconfig v0.1.0 (/source)
Dec 12 12:38:41.474 INFO [stderr] warning: variable does not need to be mutable
Dec 12 12:38:41.474 INFO [stderr]   --> src/item.rs:71:13
Dec 12 12:38:41.474 INFO [stderr]    |
Dec 12 12:38:41.474 INFO [stderr] 71 |         let mut inner = unsafe { &mut *self.inner.get() };
Dec 12 12:38:41.474 INFO [stderr]    |             ----^^^^^
Dec 12 12:38:41.474 INFO [stderr]    |             |
Dec 12 12:38:41.474 INFO [stderr]    |             help: remove this `mut`
Dec 12 12:38:41.474 INFO [stderr]    |
Dec 12 12:38:41.474 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 12:38:41.474 INFO [stderr] 
Dec 12 12:38:41.474 INFO [stderr] warning: variable does not need to be mutable
Dec 12 12:38:41.474 INFO [stderr]   --> src/item.rs:93:13
Dec 12 12:38:41.474 INFO [stderr]    |
Dec 12 12:38:41.474 INFO [stderr] 93 |         let mut inner = unsafe { &mut *self.inner.get() };
Dec 12 12:38:41.474 INFO [stderr]    |             ----^^^^^
Dec 12 12:38:41.474 INFO [stderr]    |             |
Dec 12 12:38:41.474 INFO [stderr]    |             help: remove this `mut`
Dec 12 12:38:41.474 INFO [stderr] 
Dec 12 12:38:41.760 INFO [stderr] warning: variable does not need to be mutable
Dec 12 12:38:41.760 INFO [stderr]   --> src/item.rs:71:13
Dec 12 12:38:41.760 INFO [stderr]    |
Dec 12 12:38:41.760 INFO [stderr] 71 |         let mut inner = unsafe { &mut *self.inner.get() };
Dec 12 12:38:41.760 INFO [stderr]    |             ----^^^^^
Dec 12 12:38:41.760 INFO [stderr]    |             |
Dec 12 12:38:41.760 INFO [stderr]    |             help: remove this `mut`
Dec 12 12:38:41.760 INFO [stderr]    |
Dec 12 12:38:41.760 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 12:38:41.760 INFO [stderr] 
Dec 12 12:38:41.760 INFO [stderr] warning: variable does not need to be mutable
Dec 12 12:38:41.760 INFO [stderr]   --> src/item.rs:93:13
Dec 12 12:38:41.760 INFO [stderr]    |
Dec 12 12:38:41.760 INFO [stderr] 93 |         let mut inner = unsafe { &mut *self.inner.get() };
Dec 12 12:38:41.760 INFO [stderr]    |             ----^^^^^
Dec 12 12:38:41.760 INFO [stderr]    |             |
Dec 12 12:38:41.760 INFO [stderr]    |             help: remove this `mut`
Dec 12 12:38:41.760 INFO [stderr] 
Dec 12 12:38:42.797 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.29s
Dec 12 12:38:42.798 INFO [stderr] su: No module specific data is present
Dec 12 12:38:43.916 INFO running `"docker" "inspect" "c7f17a36c36023ecf83ad08aae8394765af6b420ed30c6cc8d19cb9904c7c8a7"`
Dec 12 12:38:44.216 INFO running `"docker" "rm" "-f" "c7f17a36c36023ecf83ad08aae8394765af6b420ed30c6cc8d19cb9904c7c8a7"`
Dec 12 12:38:44.568 INFO [stdout] c7f17a36c36023ecf83ad08aae8394765af6b420ed30c6cc8d19cb9904c7c8a7