Dec 18 06:43:10.393 INFO checking Lireer/ricochet-robot-solver against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 06:43:10.393 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/Lireer/ricochet-robot-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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 06:43:10.731 INFO [stdout] 0710cb2c1ceb8f25e19d7a017524854ec2cdecdc079989d89b8971fac7bf2fdb
Dec 18 06:43:10.733 INFO running `"docker" "start" "-a" "0710cb2c1ceb8f25e19d7a017524854ec2cdecdc079989d89b8971fac7bf2fdb"`
Dec 18 06:43:12.042 INFO [stderr]     Checking text_io v0.1.6
Dec 18 06:43:12.042 INFO [stderr]     Checking num-complex v0.1.36
Dec 18 06:43:12.044 INFO [stderr]     Checking ricochet_board v0.1.0 (/opt/crater/workdir/ricochet_board)
Dec 18 06:43:12.044 INFO [stderr]     Checking num-bigint v0.1.36
Dec 18 06:43:12.648 INFO [stderr] warning: variable does not need to be mutable
Dec 18 06:43:12.648 INFO [stderr]    --> ricochet_board/src/lib.rs:261:19
Dec 18 06:43:12.648 INFO [stderr]     |
Dec 18 06:43:12.648 INFO [stderr] 261 |     fn fmt(&self, mut fmt: &mut fmt::Formatter) -> fmt::Result {
Dec 18 06:43:12.648 INFO [stderr]     |                   ----^^^
Dec 18 06:43:12.648 INFO [stderr]     |                   |
Dec 18 06:43:12.648 INFO [stderr]     |                   help: remove this `mut`
Dec 18 06:43:12.648 INFO [stderr]     |
Dec 18 06:43:12.648 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 18 06:43:12.648 INFO [stderr] 
Dec 18 06:43:12.656 INFO [stderr] warning: variable does not need to be mutable
Dec 18 06:43:12.656 INFO [stderr]    --> ricochet_board/src/lib.rs:272:19
Dec 18 06:43:12.656 INFO [stderr]     |
Dec 18 06:43:12.657 INFO [stderr] 272 |     fn fmt(&self, mut fmt: &mut fmt::Formatter) -> fmt::Result {
Dec 18 06:43:12.657 INFO [stderr]     |                   ----^^^
Dec 18 06:43:12.657 INFO [stderr]     |                   |
Dec 18 06:43:12.657 INFO [stderr]     |                   help: remove this `mut`
Dec 18 06:43:12.657 INFO [stderr] 
Dec 18 06:43:13.170 INFO [stderr]     Checking num-rational v0.1.36
Dec 18 06:43:13.746 INFO [stderr]     Checking num v0.1.37
Dec 18 06:43:14.032 INFO [stderr]     Checking ricochet_solver v0.1.0 (/opt/crater/workdir/ricochet_solver)
Dec 18 06:43:14.456 INFO [stderr] warning: variable does not need to be mutable
Dec 18 06:43:14.456 INFO [stderr]    --> ricochet_solver/src/lib.rs:233:9
Dec 18 06:43:14.456 INFO [stderr]     |
Dec 18 06:43:14.457 INFO [stderr] 233 |         mut visited_pos: &mut Vec<Vec<RobotPositions>>)
Dec 18 06:43:14.457 INFO [stderr]     |         ----^^^^^^^^^^^
Dec 18 06:43:14.457 INFO [stderr]     |         |
Dec 18 06:43:14.457 INFO [stderr]     |         help: remove this `mut`
Dec 18 06:43:14.457 INFO [stderr]     |
Dec 18 06:43:14.457 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 18 06:43:14.457 INFO [stderr] 
Dec 18 06:43:14.457 INFO [stderr] warning: function is never used: `database_solve`
Dec 18 06:43:14.457 INFO [stderr]    --> ricochet_solver/src/lib.rs:82:1
Dec 18 06:43:14.457 INFO [stderr]     |
Dec 18 06:43:14.457 INFO [stderr] 82  | / fn database_solve(board: &Board,
Dec 18 06:43:14.457 INFO [stderr] 83  | |                   positions: RobotPositions,
Dec 18 06:43:14.457 INFO [stderr] 84  | |                   target: Target,
Dec 18 06:43:14.457 INFO [stderr] 85  | |                   targetx: usize,
Dec 18 06:43:14.457 INFO [stderr] ...   |
Dec 18 06:43:14.457 INFO [stderr] 121 | |     unreachable!()
Dec 18 06:43:14.457 INFO [stderr] 122 | | }
Dec 18 06:43:14.457 INFO [stderr]     | |_^
Dec 18 06:43:14.457 INFO [stderr]     |
Dec 18 06:43:14.457 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 18 06:43:14.457 INFO [stderr] 
Dec 18 06:43:14.475 INFO [stderr]     Checking ricochet v0.1.0 (/opt/crater/workdir)
Dec 18 06:43:15.623 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.64s
Dec 18 06:43:16.196 INFO running `"docker" "inspect" "0710cb2c1ceb8f25e19d7a017524854ec2cdecdc079989d89b8971fac7bf2fdb"`
Dec 18 06:43:16.398 INFO running `"docker" "rm" "-f" "0710cb2c1ceb8f25e19d7a017524854ec2cdecdc079989d89b8971fac7bf2fdb"`
Dec 18 06:43:16.713 INFO [stdout] 0710cb2c1ceb8f25e19d7a017524854ec2cdecdc079989d89b8971fac7bf2fdb