Dec 12 02:57:27.254 INFO checking Ermain-12/Introduction-to-Rust against try#aa9aa79c3c583aab59ac9134542d60a780c35e2e for pr-56677
Dec 12 02:57:27.255 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-2/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56677/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/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 +aa9aa79c3c583aab59ac9134542d60a780c35e2e-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 02:57:27.584 INFO [stdout] ad87a3a617e9ee1c103917b55fc9cfc8feb44a77dd9ba0619e2c526a1d7fdd85
Dec 12 02:57:27.588 INFO running `"docker" "start" "-a" "ad87a3a617e9ee1c103917b55fc9cfc8feb44a77dd9ba0619e2c526a1d7fdd85"`
Dec 12 02:57:29.017 INFO [stderr] usermod: no changes
Dec 12 02:57:29.136 INFO [stderr]     Checking hello_world v0.1.0 (/source)
Dec 12 02:57:30.412 INFO [stderr] warning: variable does not need to be mutable
Dec 12 02:57:30.412 INFO [stderr]   --> src/main.rs:27:8
Dec 12 02:57:30.412 INFO [stderr]    |
Dec 12 02:57:30.412 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Dec 12 02:57:30.412 INFO [stderr]    |        ----^^^^^^^^^^
Dec 12 02:57:30.412 INFO [stderr]    |        |
Dec 12 02:57:30.412 INFO [stderr]    |        help: remove this `mut`
Dec 12 02:57:30.412 INFO [stderr]    |
Dec 12 02:57:30.413 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 02:57:30.413 INFO [stderr] 
Dec 12 02:57:30.465 INFO [stderr] warning: variable does not need to be mutable
Dec 12 02:57:30.465 INFO [stderr]   --> src/main.rs:27:8
Dec 12 02:57:30.465 INFO [stderr]    |
Dec 12 02:57:30.465 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Dec 12 02:57:30.465 INFO [stderr]    |        ----^^^^^^^^^^
Dec 12 02:57:30.465 INFO [stderr]    |        |
Dec 12 02:57:30.465 INFO [stderr]    |        help: remove this `mut`
Dec 12 02:57:30.465 INFO [stderr]    |
Dec 12 02:57:30.465 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 02:57:30.465 INFO [stderr] 
Dec 12 02:57:30.492 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.44s
Dec 12 02:57:30.494 INFO [stderr] su: No module specific data is present
Dec 12 02:57:31.533 INFO running `"docker" "inspect" "ad87a3a617e9ee1c103917b55fc9cfc8feb44a77dd9ba0619e2c526a1d7fdd85"`
Dec 12 02:57:31.680 INFO running `"docker" "rm" "-f" "ad87a3a617e9ee1c103917b55fc9cfc8feb44a77dd9ba0619e2c526a1d7fdd85"`
Dec 12 02:57:31.918 INFO [stdout] ad87a3a617e9ee1c103917b55fc9cfc8feb44a77dd9ba0619e2c526a1d7fdd85