[INFO] cloning repository https://github.com/lklacar/rust-tic-tac-toe-ai
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lklacar/rust-tic-tac-toe-ai" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flklacar%2Frust-tic-tac-toe-ai", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flklacar%2Frust-tic-tac-toe-ai'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4071d4f333eaf0b602d2deaa041e398bf8e3f014
[INFO] checking lklacar/rust-tic-tac-toe-ai against master#39b841dfe36f90a7cd111e7f0c55f32594f6e578 for pr-77035
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flklacar%2Frust-tic-tac-toe-ai" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lklacar/rust-tic-tac-toe-ai on toolchain 39b841dfe36f90a7cd111e7f0c55f32594f6e578
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lklacar/rust-tic-tac-toe-ai
[INFO] finished tweaking git repo https://github.com/lklacar/rust-tic-tac-toe-ai
[INFO] tweaked toml for git repo https://github.com/lklacar/rust-tic-tac-toe-ai written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/lklacar/rust-tic-tac-toe-ai already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d98d0b72a9287b71a62c435f02cf0306f63c84ca8ee9465b24251b05c559385b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d98d0b72a9287b71a62c435f02cf0306f63c84ca8ee9465b24251b05c559385b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d98d0b72a9287b71a62c435f02cf0306f63c84ca8ee9465b24251b05c559385b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d98d0b72a9287b71a62c435f02cf0306f63c84ca8ee9465b24251b05c559385b", kill_on_drop: false }`
[INFO] [stdout] d98d0b72a9287b71a62c435f02cf0306f63c84ca8ee9465b24251b05c559385b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f547d9dbf7cf346049c791c99b3f0c9557efc746eb08caa8273a53ee2d453635
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f547d9dbf7cf346049c791c99b3f0c9557efc746eb08caa8273a53ee2d453635", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-tic-tac-toe-ai v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `size`
[INFO] [stdout]   --> src/board.rs:10:16
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn new(size: u32) -> Board {
[INFO] [stdout]    |                ^^^^ help: if this is intentional, prefix it with an underscore: `_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cell`
[INFO] [stdout]   --> src/board.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let mut cell = match option_cell {
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_cell`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/board.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let mut cell = match option_cell {
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/board.rs:74:21
[INFO] [stdout]    |
[INFO] [stdout] 74 |                 let mut cell = match option_cell {
[INFO] [stdout]    |                     ----^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty_cells`
[INFO] [stdout]   --> src/board.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn empty_cells(&self) -> Vec<&cell::Cell> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `O`
[INFO] [stdout]  --> src/cell.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     O,
[INFO] [stdout]   |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `size`
[INFO] [stdout]   --> src/board.rs:10:16
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn new(size: u32) -> Board {
[INFO] [stdout]    |                ^^^^ help: if this is intentional, prefix it with an underscore: `_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cell`
[INFO] [stdout]   --> src/board.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let mut cell = match option_cell {
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_cell`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/board.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let mut cell = match option_cell {
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/board.rs:74:21
[INFO] [stdout]    |
[INFO] [stdout] 74 |                 let mut cell = match option_cell {
[INFO] [stdout]    |                     ----^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty_cells`
[INFO] [stdout]   --> src/board.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn empty_cells(&self) -> Vec<&cell::Cell> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `O`
[INFO] [stdout]  --> src/cell.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     O,
[INFO] [stdout]   |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.63s
[INFO] running `Command { std: "docker" "inspect" "f547d9dbf7cf346049c791c99b3f0c9557efc746eb08caa8273a53ee2d453635", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f547d9dbf7cf346049c791c99b3f0c9557efc746eb08caa8273a53ee2d453635", kill_on_drop: false }`
[INFO] [stdout] f547d9dbf7cf346049c791c99b3f0c9557efc746eb08caa8273a53ee2d453635