[INFO] updating cached repository lklacar/rust-tic-tac-toe-ai
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/lklacar/rust-tic-tac-toe-ai
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/lklacar/rust-tic-tac-toe-ai" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/lklacar/rust-tic-tac-toe-ai"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/lklacar/rust-tic-tac-toe-ai'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/lklacar/rust-tic-tac-toe-ai" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/lklacar/rust-tic-tac-toe-ai"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/lklacar/rust-tic-tac-toe-ai'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4071d4f333eaf0b602d2deaa041e398bf8e3f014
[INFO] sha for GitHub repo lklacar/rust-tic-tac-toe-ai: 4071d4f333eaf0b602d2deaa041e398bf8e3f014
[INFO] validating manifest of lklacar/rust-tic-tac-toe-ai on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of lklacar/rust-tic-tac-toe-ai on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing lklacar/rust-tic-tac-toe-ai
[INFO] finished frobbing lklacar/rust-tic-tac-toe-ai
[INFO] frobbed toml for lklacar/rust-tic-tac-toe-ai written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/lklacar/rust-tic-tac-toe-ai/Cargo.toml
[INFO] started frobbing lklacar/rust-tic-tac-toe-ai
[INFO] finished frobbing lklacar/rust-tic-tac-toe-ai
[INFO] frobbed toml for lklacar/rust-tic-tac-toe-ai written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/lklacar/rust-tic-tac-toe-ai/Cargo.toml
[INFO] crate lklacar/rust-tic-tac-toe-ai already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking lklacar/rust-tic-tac-toe-ai against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-3/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/lklacar/rust-tic-tac-toe-ai:/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" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 08d20ffede8c59d341c4547e0a04fd32ecbde921374f1c90b88a9cae4346a1c9
[INFO] running `"docker" "start" "-a" "08d20ffede8c59d341c4547e0a04fd32ecbde921374f1c90b88a9cae4346a1c9"`
[INFO] [stderr]     Checking rust-tic-tac-toe-ai v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `size`
[INFO] [stderr]   --> src/board.rs:10:16
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn new(size: u32) -> Board {
[INFO] [stderr]    |                ^^^^ help: consider prefixing with an underscore: `_size`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cell`
[INFO] [stderr]   --> src/board.rs:51:17
[INFO] [stderr]    |
[INFO] [stderr] 51 |         let mut cell = match option_cell {
[INFO] [stderr]    |                 ^^^^ help: consider prefixing with an underscore: `_cell`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/board.rs:51:13
[INFO] [stderr]    |
[INFO] [stderr] 51 |         let mut cell = match option_cell {
[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/board.rs:74:21
[INFO] [stderr]    |
[INFO] [stderr] 74 |                 let mut cell = match option_cell {
[INFO] [stderr]    |                     ----^^^^
[INFO] [stderr]    |                     |
[INFO] [stderr]    |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `empty_cells`
[INFO] [stderr]   --> src/board.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn empty_cells(&self) -> Vec<&cell::Cell> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `O`
[INFO] [stderr]  --> src/cell.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     O,
[INFO] [stderr]   |     ^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `size`
[INFO] [stderr]   --> src/board.rs:10:16
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn new(size: u32) -> Board {
[INFO] [stderr]    |                ^^^^ help: consider prefixing with an underscore: `_size`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cell`
[INFO] [stderr]   --> src/board.rs:51:17
[INFO] [stderr]    |
[INFO] [stderr] 51 |         let mut cell = match option_cell {
[INFO] [stderr]    |                 ^^^^ help: consider prefixing with an underscore: `_cell`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/board.rs:51:13
[INFO] [stderr]    |
[INFO] [stderr] 51 |         let mut cell = match option_cell {
[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/board.rs:74:21
[INFO] [stderr]    |
[INFO] [stderr] 74 |                 let mut cell = match option_cell {
[INFO] [stderr]    |                     ----^^^^
[INFO] [stderr]    |                     |
[INFO] [stderr]    |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `empty_cells`
[INFO] [stderr]   --> src/board.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn empty_cells(&self) -> Vec<&cell::Cell> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `O`
[INFO] [stderr]  --> src/cell.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     O,
[INFO] [stderr]   |     ^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `"docker" "inspect" "08d20ffede8c59d341c4547e0a04fd32ecbde921374f1c90b88a9cae4346a1c9"`
[INFO] running `"docker" "rm" "-f" "08d20ffede8c59d341c4547e0a04fd32ecbde921374f1c90b88a9cae4346a1c9"`
[INFO] [stdout] 08d20ffede8c59d341c4547e0a04fd32ecbde921374f1c90b88a9cae4346a1c9