Dec 18 07:46:29.864 INFO checking Ermain-12/Introduction-to-Rust against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 07:46:29.864 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/Ermain-12/Introduction-to-Rust:/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 07:46:30.083 INFO [stdout] f59f9c038e2631a7622ba41f9aa3686e56b934b94a46d7c23443d5f73ff7088f
Dec 18 07:46:30.086 INFO running `"docker" "start" "-a" "f59f9c038e2631a7622ba41f9aa3686e56b934b94a46d7c23443d5f73ff7088f"`
Dec 18 07:46:30.838 INFO [stderr]     Checking hello_world v0.1.0 (/opt/crater/workdir)
Dec 18 07:46:31.133 INFO [stderr] warning: variable does not need to be mutable
Dec 18 07:46:31.133 INFO [stderr]   --> src/main.rs:27:8
Dec 18 07:46:31.133 INFO [stderr]    |
Dec 18 07:46:31.133 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Dec 18 07:46:31.133 INFO [stderr]    |        ----^^^^^^^^^^
Dec 18 07:46:31.133 INFO [stderr]    |        |
Dec 18 07:46:31.133 INFO [stderr]    |        help: remove this `mut`
Dec 18 07:46:31.133 INFO [stderr]    |
Dec 18 07:46:31.133 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 07:46:31.133 INFO [stderr] 
Dec 18 07:46:31.140 INFO [stderr] warning: variable does not need to be mutable
Dec 18 07:46:31.140 INFO [stderr]   --> src/main.rs:27:8
Dec 18 07:46:31.140 INFO [stderr]    |
Dec 18 07:46:31.140 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Dec 18 07:46:31.140 INFO [stderr]    |        ----^^^^^^^^^^
Dec 18 07:46:31.140 INFO [stderr]    |        |
Dec 18 07:46:31.140 INFO [stderr]    |        help: remove this `mut`
Dec 18 07:46:31.140 INFO [stderr]    |
Dec 18 07:46:31.140 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 07:46:31.140 INFO [stderr] 
Dec 18 07:46:31.160 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.37s
Dec 18 07:46:31.474 INFO running `"docker" "inspect" "f59f9c038e2631a7622ba41f9aa3686e56b934b94a46d7c23443d5f73ff7088f"`
Dec 18 07:46:31.566 INFO running `"docker" "rm" "-f" "f59f9c038e2631a7622ba41f9aa3686e56b934b94a46d7c23443d5f73ff7088f"`
Dec 18 07:46:31.650 INFO [stdout] f59f9c038e2631a7622ba41f9aa3686e56b934b94a46d7c23443d5f73ff7088f