Dec 05 02:37:26.297 INFO checking Ermain-12/Introduction-to-Rust against try#1df97983eb2057dc6a8f7eb364e263b51ae23230 for pr-56481
Dec 05 02:37:26.297 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-7/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-7/pr-56481/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/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 +1df97983eb2057dc6a8f7eb364e263b51ae23230-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 05 02:37:26.727 INFO [stdout] 3befb92106f64f3424729c4cd84f9fe695c6afeef41007f960aaae82a59f7ba9
Dec 05 02:37:26.736 INFO running `"docker" "start" "-a" "3befb92106f64f3424729c4cd84f9fe695c6afeef41007f960aaae82a59f7ba9"`
Dec 05 02:37:28.215 INFO [stderr] usermod: no changes
Dec 05 02:37:28.383 INFO [stderr]     Checking hello_world v0.1.0 (/source)
Dec 05 02:37:29.987 INFO [stderr] warning: variable does not need to be mutable
Dec 05 02:37:29.987 INFO [stderr]   --> src/main.rs:27:8
Dec 05 02:37:29.987 INFO [stderr]    |
Dec 05 02:37:29.987 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Dec 05 02:37:29.987 INFO [stderr]    |        ----^^^^^^^^^^
Dec 05 02:37:29.987 INFO [stderr]    |        |
Dec 05 02:37:29.987 INFO [stderr]    |        help: remove this `mut`
Dec 05 02:37:29.987 INFO [stderr]    |
Dec 05 02:37:29.987 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 02:37:29.987 INFO [stderr] 
Dec 05 02:37:30.151 INFO [stderr] warning: variable does not need to be mutable
Dec 05 02:37:30.151 INFO [stderr]   --> src/main.rs:27:8
Dec 05 02:37:30.151 INFO [stderr]    |
Dec 05 02:37:30.151 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Dec 05 02:37:30.151 INFO [stderr]    |        ----^^^^^^^^^^
Dec 05 02:37:30.151 INFO [stderr]    |        |
Dec 05 02:37:30.151 INFO [stderr]    |        help: remove this `mut`
Dec 05 02:37:30.151 INFO [stderr]    |
Dec 05 02:37:30.151 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 02:37:30.151 INFO [stderr] 
Dec 05 02:37:30.183 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.94s
Dec 05 02:37:30.187 INFO [stderr] su: No module specific data is present
Dec 05 02:37:30.792 INFO running `"docker" "inspect" "3befb92106f64f3424729c4cd84f9fe695c6afeef41007f960aaae82a59f7ba9"`
Dec 05 02:37:31.159 INFO running `"docker" "rm" "-f" "3befb92106f64f3424729c4cd84f9fe695c6afeef41007f960aaae82a59f7ba9"`
Dec 05 02:37:31.427 INFO [stdout] 3befb92106f64f3424729c4cd84f9fe695c6afeef41007f960aaae82a59f7ba9