[INFO] cloning repository https://github.com/thomasdelrue/rusty-mazes
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/thomasdelrue/rusty-mazes" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthomasdelrue%2Frusty-mazes", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthomasdelrue%2Frusty-mazes'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fa5c1a29e24985e6db66afbb07c6070a6cfb04d2
[INFO] checking thomasdelrue/rusty-mazes against try#39e1293fce4b650061e85dda88aa428f726a8444 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthomasdelrue%2Frusty-mazes" "/workspace/builds/worker-101/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-101/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/thomasdelrue/rusty-mazes on toolchain 39e1293fce4b650061e85dda88aa428f726a8444
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/thomasdelrue/rusty-mazes
[INFO] finished tweaking git repo https://github.com/thomasdelrue/rusty-mazes
[INFO] tweaked toml for git repo https://github.com/thomasdelrue/rusty-mazes written to /workspace/builds/worker-101/source/Cargo.toml
[INFO] crate git repo https://github.com/thomasdelrue/rusty-mazes already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 43a2f118ec8a48f7d354afb291a5b75fadfa4d12ad8c51a28aef00d0dd899c5d
[INFO] running `Command { std: "docker" "start" "-a" "43a2f118ec8a48f7d354afb291a5b75fadfa4d12ad8c51a28aef00d0dd899c5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43a2f118ec8a48f7d354afb291a5b75fadfa4d12ad8c51a28aef00d0dd899c5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43a2f118ec8a48f7d354afb291a5b75fadfa4d12ad8c51a28aef00d0dd899c5d", kill_on_drop: false }`
[INFO] [stdout] 43a2f118ec8a48f7d354afb291a5b75fadfa4d12ad8c51a28aef00d0dd899c5d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 91dece2d2edd7be23f84468dca214abea314d7721684d7ec95b96ed0043976e4
[INFO] running `Command { std: "docker" "start" "-a" "91dece2d2edd7be23f84468dca214abea314d7721684d7ec95b96ed0043976e4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.95
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking mazes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `links`
[INFO] [stdout]  --> src/cell.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     links: HashMap<(u8, u8), bool>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pos`
[INFO] [stdout]   --> src/cell.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn pos(&self) -> (u8, u8) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `link`
[INFO] [stdout]   --> src/cell.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn link(&mut self, other: &mut Cell, bidi: bool) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unlink`
[INFO] [stdout]   --> src/cell.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn unlink(&mut self, other: &mut Cell, bidi: bool) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `links`
[INFO] [stdout]   --> src/cell.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn links(&self) -> hash_map::Keys<(u8, u8), bool> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_linked_to`
[INFO] [stdout]   --> src/cell.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn is_linked_to(&self, other: &Cell) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `random_cell`
[INFO] [stdout]   --> src/grid.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn random_cell(&self) -> &Cell {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> src/grid.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn size(&self) -> usize {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unlink`
[INFO] [stdout]   --> src/cell.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn unlink(&mut self, other: &mut Cell, bidi: bool) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `links`
[INFO] [stdout]   --> src/cell.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn links(&self) -> hash_map::Keys<(u8, u8), bool> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> src/grid.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn size(&self) -> usize {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.47s
[INFO] running `Command { std: "docker" "inspect" "91dece2d2edd7be23f84468dca214abea314d7721684d7ec95b96ed0043976e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91dece2d2edd7be23f84468dca214abea314d7721684d7ec95b96ed0043976e4", kill_on_drop: false }`
[INFO] [stdout] 91dece2d2edd7be23f84468dca214abea314d7721684d7ec95b96ed0043976e4