Dec 05 02:37:27.357 INFO checking Ermain-12/Introduction-to-Rust against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 05 02:37:27.357 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-6/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56481/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/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 +c8ae2de8363be088604ffa2ccba84ff7ad7250bc-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 02:37:27.827 INFO [stdout] 09ad7da119c8039ca8f2f5cc578d8ce8d6fcb81677e43f344db1145b4468dc09
Dec 05 02:37:27.831 INFO running `"docker" "start" "-a" "09ad7da119c8039ca8f2f5cc578d8ce8d6fcb81677e43f344db1145b4468dc09"`
Dec 05 02:37:29.351 INFO [stderr] usermod: no changes
Dec 05 02:37:29.446 INFO [stderr]     Checking hello_world v0.1.0 (/source)
Dec 05 02:37:30.855 INFO [stderr] warning: variable does not need to be mutable
Dec 05 02:37:30.855 INFO [stderr]   --> src/main.rs:27:8
Dec 05 02:37:30.855 INFO [stderr]    |
Dec 05 02:37:30.855 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Dec 05 02:37:30.855 INFO [stderr]    |        ----^^^^^^^^^^
Dec 05 02:37:30.855 INFO [stderr]    |        |
Dec 05 02:37:30.855 INFO [stderr]    |        help: remove this `mut`
Dec 05 02:37:30.855 INFO [stderr]    |
Dec 05 02:37:30.855 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 02:37:30.855 INFO [stderr] 
Dec 05 02:37:31.027 INFO [stderr] warning: variable does not need to be mutable
Dec 05 02:37:31.027 INFO [stderr]   --> src/main.rs:27:8
Dec 05 02:37:31.027 INFO [stderr]    |
Dec 05 02:37:31.027 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Dec 05 02:37:31.027 INFO [stderr]    |        ----^^^^^^^^^^
Dec 05 02:37:31.027 INFO [stderr]    |        |
Dec 05 02:37:31.027 INFO [stderr]    |        help: remove this `mut`
Dec 05 02:37:31.027 INFO [stderr]    |
Dec 05 02:37:31.027 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 02:37:31.027 INFO [stderr] 
Dec 05 02:37:31.073 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.69s
Dec 05 02:37:31.073 INFO [stderr] su: No module specific data is present
Dec 05 02:37:31.596 INFO running `"docker" "inspect" "09ad7da119c8039ca8f2f5cc578d8ce8d6fcb81677e43f344db1145b4468dc09"`
Dec 05 02:37:32.027 INFO running `"docker" "rm" "-f" "09ad7da119c8039ca8f2f5cc578d8ce8d6fcb81677e43f344db1145b4468dc09"`
Dec 05 02:37:32.338 INFO [stdout] 09ad7da119c8039ca8f2f5cc578d8ce8d6fcb81677e43f344db1145b4468dc09