[INFO] cloning repository https://github.com/victorlaurentiu/maze_gen
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/victorlaurentiu/maze_gen" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvictorlaurentiu%2Fmaze_gen", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ab01fff9b9c2483b1783cc85b9971d219f9d6c4f
[INFO] checking victorlaurentiu/maze_gen against try#4797991aa2efb6d658150f10425b3f3b5d10eceb for pr-143193
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvictorlaurentiu%2Fmaze_gen" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/victorlaurentiu/maze_gen
[INFO] finished tweaking git repo https://github.com/victorlaurentiu/maze_gen
[INFO] tweaked toml for git repo https://github.com/victorlaurentiu/maze_gen written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/victorlaurentiu/maze_gen on toolchain 4797991aa2efb6d658150f10425b3f3b5d10eceb
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4797991aa2efb6d658150f10425b3f3b5d10eceb" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/victorlaurentiu/maze_gen already has a lockfile, it will not be regenerated
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+4797991aa2efb6d658150f10425b3f3b5d10eceb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] [stdout] warning: unused variable: `obs`
[INFO] [stdout]   --> src/maze_gen_algos.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let obs = obs.unwrap_or(&fake_obs);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_obs`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `off_i`
[INFO] [stdout]   --> src/maze_gen_algos.rs:52:18
[INFO] [stdout]    |
[INFO] [stdout] 52 |             let (off_i, off_j) = match distr.sample(&mut gen) {
[INFO] [stdout]    |                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_off_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `off_j`
[INFO] [stdout]   --> src/maze_gen_algos.rs:52:25
[INFO] [stdout]    |
[INFO] [stdout] 52 |             let (off_i, off_j) = match distr.sample(&mut gen) {
[INFO] [stdout]    |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_off_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Direction` is never used
[INFO] [stdout]  --> src/grid.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub enum Direction {
[INFO] [stdout]   |          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GridCoords` is never constructed
[INFO] [stdout]   --> src/grid.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct GridCoords {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_cell_coords` is never used
[INFO] [stdout]   --> src/grid.rs:48:12
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl Grid {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 48 |     pub fn get_cell_coords(&self, coord: &GridCoords) -> Option<&Cell> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `update` is never used
[INFO] [stdout]   --> src/maze_gen_algos.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub trait Observer {
[INFO] [stdout]    |           -------- method in this trait
[INFO] [stdout] 12 |     fn update(&self);
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_rand_kruskal` is never used
[INFO] [stdout]   --> src/maze_gen_algos.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn create_rand_kruskal() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `obs`
[INFO] [stdout]   --> src/maze_gen_algos.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let obs = obs.unwrap_or(&fake_obs);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_obs`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `off_i`
[INFO] [stdout]   --> src/maze_gen_algos.rs:52:18
[INFO] [stdout]    |
[INFO] [stdout] 52 |             let (off_i, off_j) = match distr.sample(&mut gen) {
[INFO] [stdout]    |                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_off_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `off_j`
[INFO] [stdout]   --> src/maze_gen_algos.rs:52:25
[INFO] [stdout]    |
[INFO] [stdout] 52 |             let (off_i, off_j) = match distr.sample(&mut gen) {
[INFO] [stdout]    |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_off_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Direction` is never used
[INFO] [stdout]  --> src/grid.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub enum Direction {
[INFO] [stdout]   |          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GridCoords` is never constructed
[INFO] [stdout]   --> src/grid.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct GridCoords {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_cell_coords` is never used
[INFO] [stdout]   --> src/grid.rs:48:12
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl Grid {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 48 |     pub fn get_cell_coords(&self, coord: &GridCoords) -> Option<&Cell> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `update` is never used
[INFO] [stdout]   --> src/maze_gen_algos.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub trait Observer {
[INFO] [stdout]    |           -------- method in this trait
[INFO] [stdout] 12 |     fn update(&self);
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_rand_kruskal` is never used
[INFO] [stdout]   --> src/maze_gen_algos.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn create_rand_kruskal() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 06s
[INFO] running `Command { std: "docker" "inspect" "a62fd2f4bc02670b256be632c71413a17bebfad6f31c9c0fd2996c1f12d0e26e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a62fd2f4bc02670b256be632c71413a17bebfad6f31c9c0fd2996c1f12d0e26e", kill_on_drop: false }`
[INFO] [stdout] a62fd2f4bc02670b256be632c71413a17bebfad6f31c9c0fd2996c1f12d0e26e