[INFO] updating cached repository k2bd/star_battle_mc_solver
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/k2bd/star_battle_mc_solver
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/k2bd/star_battle_mc_solver" "work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/k2bd/star_battle_mc_solver"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/k2bd/star_battle_mc_solver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/k2bd/star_battle_mc_solver" "work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/k2bd/star_battle_mc_solver"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/k2bd/star_battle_mc_solver'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3c62c3ca2292e3646fcc9b021e097eb71be6a772
[INFO] sha for GitHub repo k2bd/star_battle_mc_solver: 3c62c3ca2292e3646fcc9b021e097eb71be6a772
[INFO] validating manifest of k2bd/star_battle_mc_solver on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of k2bd/star_battle_mc_solver on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing k2bd/star_battle_mc_solver
[INFO] finished frobbing k2bd/star_battle_mc_solver
[INFO] frobbed toml for k2bd/star_battle_mc_solver written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/k2bd/star_battle_mc_solver/Cargo.toml
[INFO] started frobbing k2bd/star_battle_mc_solver
[INFO] finished frobbing k2bd/star_battle_mc_solver
[INFO] frobbed toml for k2bd/star_battle_mc_solver written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/k2bd/star_battle_mc_solver/Cargo.toml
[INFO] crate k2bd/star_battle_mc_solver already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking k2bd/star_battle_mc_solver against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-5/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/k2bd/star_battle_mc_solver:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] e6d75919ce4092d742d97feb5f7254439c6cd2d328cc612d73f74db9e0565e13
[INFO] running `"docker" "start" "-a" "e6d75919ce4092d742d97feb5f7254439c6cd2d328cc612d73f74db9e0565e13"`
[INFO] [stderr]     Checking star_battle v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use rand::Rng;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use rand::Rng;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `regions`
[INFO] [stderr]   --> src/main.rs:92:39
[INFO] [stderr]    |
[INFO] [stderr] 92 | fn score(star_board: &Vec<Vec<bool>>, regions: &Vec<Vec<char>>, n_stars: usize) -> usize {
[INFO] [stderr]    |                                       ^^^^^^^ help: consider prefixing with an underscore: `_regions`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]    --> src/main.rs:131:9
[INFO] [stderr]     |
[INFO] [stderr] 131 |     for row in board {
[INFO] [stderr]     |         ^^^ help: consider prefixing with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `regions`
[INFO] [stderr]   --> src/main.rs:92:39
[INFO] [stderr]    |
[INFO] [stderr] 92 | fn score(star_board: &Vec<Vec<bool>>, regions: &Vec<Vec<char>>, n_stars: usize) -> usize {
[INFO] [stderr]    |                                       ^^^^^^^ help: consider prefixing with an underscore: `_regions`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]    --> src/main.rs:131:9
[INFO] [stderr]     |
[INFO] [stderr] 131 |     for row in board {
[INFO] [stderr]     |         ^^^ help: consider prefixing with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let mut filename;
[INFO] [stderr]    |         ----^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let mut filename;
[INFO] [stderr]    |         ----^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.11s
[INFO] running `"docker" "inspect" "e6d75919ce4092d742d97feb5f7254439c6cd2d328cc612d73f74db9e0565e13"`
[INFO] running `"docker" "rm" "-f" "e6d75919ce4092d742d97feb5f7254439c6cd2d328cc612d73f74db9e0565e13"`
[INFO] [stdout] e6d75919ce4092d742d97feb5f7254439c6cd2d328cc612d73f74db9e0565e13