Nov 28 13:43:12.808 INFO checking Ermain-12/Introduction-to-Rust against try#db42d4dad33013eba11ef37342ad9f614e5652b8 for pr-56074
Nov 28 13:43:12.809 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56074/worker-1/try#db42d4dad33013eba11ef37342ad9f614e5652b8:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56074/try#db42d4dad33013eba11ef37342ad9f614e5652b8:/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 +db42d4dad33013eba11ef37342ad9f614e5652b8-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 13:43:13.165 INFO [stdout] aa1f63d720ba11521ee43ce13e4d8a86fde65af1b6ee064017e5e4d489f30bb1
Nov 28 13:43:13.170 INFO running `"docker" "start" "-a" "aa1f63d720ba11521ee43ce13e4d8a86fde65af1b6ee064017e5e4d489f30bb1"`
Nov 28 13:43:13.958 INFO [stderr] usermod: no changes
Nov 28 13:43:14.060 INFO [stderr]     Checking hello_world v0.1.0 (/source)
Nov 28 13:43:15.280 INFO [stderr] warning: variable does not need to be mutable
Nov 28 13:43:15.280 INFO [stderr]   --> src/main.rs:27:8
Nov 28 13:43:15.280 INFO [stderr]    |
Nov 28 13:43:15.280 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Nov 28 13:43:15.280 INFO [stderr]    |        ----^^^^^^^^^^
Nov 28 13:43:15.280 INFO [stderr]    |        |
Nov 28 13:43:15.280 INFO [stderr]    |        help: remove this `mut`
Nov 28 13:43:15.280 INFO [stderr]    |
Nov 28 13:43:15.280 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 28 13:43:15.280 INFO [stderr] 
Nov 28 13:43:15.388 INFO [stderr] warning: variable does not need to be mutable
Nov 28 13:43:15.388 INFO [stderr]   --> src/main.rs:27:8
Nov 28 13:43:15.388 INFO [stderr]    |
Nov 28 13:43:15.388 INFO [stderr] 27 |    let mut twenty_one = my_vec.pop();
Nov 28 13:43:15.388 INFO [stderr]    |        ----^^^^^^^^^^
Nov 28 13:43:15.388 INFO [stderr]    |        |
Nov 28 13:43:15.388 INFO [stderr]    |        help: remove this `mut`
Nov 28 13:43:15.388 INFO [stderr]    |
Nov 28 13:43:15.388 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 28 13:43:15.388 INFO [stderr] 
Nov 28 13:43:15.420 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.44s
Nov 28 13:43:15.428 INFO [stderr] su: No module specific data is present
Nov 28 13:43:15.988 INFO running `"docker" "inspect" "aa1f63d720ba11521ee43ce13e4d8a86fde65af1b6ee064017e5e4d489f30bb1"`
Nov 28 13:43:16.280 INFO running `"docker" "rm" "-f" "aa1f63d720ba11521ee43ce13e4d8a86fde65af1b6ee064017e5e4d489f30bb1"`
Nov 28 13:43:16.568 INFO [stdout] aa1f63d720ba11521ee43ce13e4d8a86fde65af1b6ee064017e5e4d489f30bb1