Nov 28 13:43:12.927 INFO checking Ermain-12/Introduction-to-Rust against master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5 for pr-56074
Nov 28 13:43:12.929 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56074/worker-6/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56074/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/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 +0b9f19dff1347e29bf4362ab5a8fab84b43023b5-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"`
Nov 28 13:43:13.296 INFO [stdout] 0849ef8e33ddf7d844ca8defa733d300c3ad5c81a3c6bd58be64a7de81ff549b
Nov 28 13:43:13.300 INFO running `"docker" "start" "-a" "0849ef8e33ddf7d844ca8defa733d300c3ad5c81a3c6bd58be64a7de81ff549b"`
Nov 28 13:43:14.276 INFO [stderr] usermod: no changes
Nov 28 13:43:14.384 INFO [stderr]     Checking hello_world v0.1.0 (/source)
Nov 28 13:43:15.504 INFO [stderr] warning: variable does not need to be mutable
Nov 28 13:43:15.504 INFO [stderr]   --> src/main.rs:27:8
Nov 28 13:43:15.504 INFO [stderr]    |
Nov 28 13:43:15.504 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Nov 28 13:43:15.504 INFO [stderr]    |        ----^^^^^^^^^^
Nov 28 13:43:15.504 INFO [stderr]    |        |
Nov 28 13:43:15.504 INFO [stderr]    |        help: remove this `mut`
Nov 28 13:43:15.504 INFO [stderr]    |
Nov 28 13:43:15.504 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 28 13:43:15.504 INFO [stderr] 
Nov 28 13:43:15.524 INFO [stderr] warning: variable does not need to be mutable
Nov 28 13:43:15.524 INFO [stderr]   --> src/main.rs:27:8
Nov 28 13:43:15.524 INFO [stderr]    |
Nov 28 13:43:15.524 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Nov 28 13:43:15.524 INFO [stderr]    |        ----^^^^^^^^^^
Nov 28 13:43:15.524 INFO [stderr]    |        |
Nov 28 13:43:15.524 INFO [stderr]    |        help: remove this `mut`
Nov 28 13:43:15.524 INFO [stderr]    |
Nov 28 13:43:15.524 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 28 13:43:15.524 INFO [stderr] 
Nov 28 13:43:15.576 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.28s
Nov 28 13:43:15.599 INFO [stderr] su: No module specific data is present
Nov 28 13:43:16.280 INFO running `"docker" "inspect" "0849ef8e33ddf7d844ca8defa733d300c3ad5c81a3c6bd58be64a7de81ff549b"`
Nov 28 13:43:16.554 INFO running `"docker" "rm" "-f" "0849ef8e33ddf7d844ca8defa733d300c3ad5c81a3c6bd58be64a7de81ff549b"`
Nov 28 13:43:16.847 INFO [stdout] 0849ef8e33ddf7d844ca8defa733d300c3ad5c81a3c6bd58be64a7de81ff549b