Dec 12 07:46:10.684 INFO checking serde-xml-rs-0.2.1 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 07:46:10.685 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-2/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/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 07:46:11.227 INFO [stdout] b08726c17717a3b48e609f40a01f44a19ebfba38d744fa4372b8c26c412c3c0a
Dec 12 07:46:11.240 INFO running `"docker" "start" "-a" "b08726c17717a3b48e609f40a01f44a19ebfba38d744fa4372b8c26c412c3c0a"`
Dec 12 07:46:11.908 INFO [stderr] usermod: no changes
Dec 12 07:46:11.994 INFO [stderr]     Checking serde-xml-rs v0.2.1 (/source)
Dec 12 07:46:13.040 INFO [stderr] warning: variable does not need to be mutable
Dec 12 07:46:13.040 INFO [stderr]   --> src/serialize.rs:89:23
Dec 12 07:46:13.040 INFO [stderr]    |
Dec 12 07:46:13.040 INFO [stderr] 89 |     fn serialize_bool(mut self, v: bool) -> Result<Self::Ok, Self::Error> {
Dec 12 07:46:13.040 INFO [stderr]    |                       ----^^^^
Dec 12 07:46:13.040 INFO [stderr]    |                       |
Dec 12 07:46:13.040 INFO [stderr]    |                       help: remove this `mut`
Dec 12 07:46:13.040 INFO [stderr]    |
Dec 12 07:46:13.040 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 07:46:13.040 INFO [stderr] 
Dec 12 07:46:13.286 INFO [stderr] warning: variable does not need to be mutable
Dec 12 07:46:13.286 INFO [stderr]   --> src/serialize.rs:89:23
Dec 12 07:46:13.286 INFO [stderr]    |
Dec 12 07:46:13.286 INFO [stderr] 89 |     fn serialize_bool(mut self, v: bool) -> Result<Self::Ok, Self::Error> {
Dec 12 07:46:13.286 INFO [stderr]    |                       ----^^^^
Dec 12 07:46:13.286 INFO [stderr]    |                       |
Dec 12 07:46:13.286 INFO [stderr]    |                       help: remove this `mut`
Dec 12 07:46:13.286 INFO [stderr]    |
Dec 12 07:46:13.286 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 07:46:13.286 INFO [stderr] 
Dec 12 07:46:16.407 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.47s
Dec 12 07:46:16.411 INFO [stderr] su: No module specific data is present
Dec 12 07:46:16.830 INFO running `"docker" "inspect" "b08726c17717a3b48e609f40a01f44a19ebfba38d744fa4372b8c26c412c3c0a"`
Dec 12 07:46:17.014 INFO running `"docker" "rm" "-f" "b08726c17717a3b48e609f40a01f44a19ebfba38d744fa4372b8c26c412c3c0a"`
Dec 12 07:46:17.142 INFO [stdout] b08726c17717a3b48e609f40a01f44a19ebfba38d744fa4372b8c26c412c3c0a