[INFO] cloning repository https://github.com/TheRiven/mazegenerator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TheRiven/mazegenerator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTheRiven%2Fmazegenerator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTheRiven%2Fmazegenerator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9e021d139b3ec222eae371c8cfb95033e6e5a168
[INFO] testing TheRiven/mazegenerator against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTheRiven%2Fmazegenerator" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TheRiven/mazegenerator on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/TheRiven/mazegenerator
[INFO] finished tweaking git repo https://github.com/TheRiven/mazegenerator
[INFO] tweaked toml for git repo https://github.com/TheRiven/mazegenerator written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/TheRiven/mazegenerator already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c226c816cf58754fce41cbf6f9e55da285253dba00647846b04ce01c121b242e
[INFO] running `Command { std: "docker" "start" "-a" "c226c816cf58754fce41cbf6f9e55da285253dba00647846b04ce01c121b242e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c226c816cf58754fce41cbf6f9e55da285253dba00647846b04ce01c121b242e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c226c816cf58754fce41cbf6f9e55da285253dba00647846b04ce01c121b242e", kill_on_drop: false }`
[INFO] [stdout] c226c816cf58754fce41cbf6f9e55da285253dba00647846b04ce01c121b242e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0be9ba0539a6940b7315af131a2b3b72e7f73976be6903860871590c2573baf4
[INFO] running `Command { std: "docker" "start" "-a" "0be9ba0539a6940b7315af131a2b3b72e7f73976be6903860871590c2573baf4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling cfg-if v0.1.2
[INFO] [stderr]    Compiling nodrop v0.1.12
[INFO] [stderr]    Compiling num-traits v0.2.2
[INFO] [stderr]    Compiling memoffset v0.2.1
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]    Compiling scopeguard v0.3.3
[INFO] [stderr]    Compiling libc v0.2.39
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling adler32 v1.0.2
[INFO] [stderr]    Compiling byteorder v1.2.1
[INFO] [stderr]    Compiling lazy_static v1.0.0
[INFO] [stderr]    Compiling either v1.4.0
[INFO] [stderr]    Compiling lzw v0.10.0
[INFO] [stderr]    Compiling bitflags v1.0.1
[INFO] [stderr]    Compiling color_quant v1.0.0
[INFO] [stderr]    Compiling scoped_threadpool v0.1.9
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling arrayvec v0.4.7
[INFO] [stderr]    Compiling inflate v0.3.4
[INFO] [stderr]    Compiling gif v0.9.2
[INFO] [stderr]    Compiling deflate v0.7.17
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.0
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling num-integer v0.1.36
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[INFO] [stderr]    Compiling num-iter v0.1.35
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling png v0.11.0
[INFO] [stderr]    Compiling rayon v1.0.1
[INFO] [stderr]    Compiling jpeg-decoder v0.1.14
[INFO] [stderr]    Compiling image v0.18.0
[INFO] [stderr]    Compiling mazegenerator v0.8.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/mazebuilder/dfs.rs:86:74
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stdout]    |                                                                          ^                     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 86 - fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stdout] 86 + fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> (&'a Cell, Direction) {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/mazebuilder/dfs.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 |     (chosen)
[INFO] [stdout]    |     ^      ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 92 -     (chosen)
[INFO] [stdout] 92 +     chosen
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/mazebuilder/maze.rs:25:54
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn get_cell(&self, x: u32, y: u32) -> Option<(&Cell)> {
[INFO] [stdout]    |                                                      ^     ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 25 -     pub fn get_cell(&self, x: u32, y: u32) -> Option<(&Cell)> {
[INFO] [stdout] 25 +     pub fn get_cell(&self, x: u32, y: u32) -> Option<&Cell> {
[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 15.51s
[INFO] running `Command { std: "docker" "inspect" "0be9ba0539a6940b7315af131a2b3b72e7f73976be6903860871590c2573baf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0be9ba0539a6940b7315af131a2b3b72e7f73976be6903860871590c2573baf4", kill_on_drop: false }`
[INFO] [stdout] 0be9ba0539a6940b7315af131a2b3b72e7f73976be6903860871590c2573baf4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e25eaedc66b9f190fb40ae165e2edb140c1cec909d3ea264a72530d4cf2431b4
[INFO] running `Command { std: "docker" "start" "-a" "e25eaedc66b9f190fb40ae165e2edb140c1cec909d3ea264a72530d4cf2431b4", kill_on_drop: false }`
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/mazebuilder/dfs.rs:86:74
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stdout]    |                                                                          ^                     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 86 - fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stdout] 86 + fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> (&'a Cell, Direction) {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/mazebuilder/dfs.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 |     (chosen)
[INFO] [stdout]    |     ^      ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 92 -     (chosen)
[INFO] [stdout] 92 +     chosen
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling mazegenerator v0.8.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/mazebuilder/maze.rs:25:54
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn get_cell(&self, x: u32, y: u32) -> Option<(&Cell)> {
[INFO] [stdout]    |                                                      ^     ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 25 -     pub fn get_cell(&self, x: u32, y: u32) -> Option<(&Cell)> {
[INFO] [stdout] 25 +     pub fn get_cell(&self, x: u32, y: u32) -> Option<&Cell> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/mazebuilder/dfs.rs:86:74
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stdout]    |                                                                          ^                     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 86 - fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stdout] 86 + fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> (&'a Cell, Direction) {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/mazebuilder/dfs.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 |     (chosen)
[INFO] [stdout]    |     ^      ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 92 -     (chosen)
[INFO] [stdout] 92 +     chosen
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/mazebuilder/maze.rs:25:54
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn get_cell(&self, x: u32, y: u32) -> Option<(&Cell)> {
[INFO] [stdout]    |                                                      ^     ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 25 -     pub fn get_cell(&self, x: u32, y: u32) -> Option<(&Cell)> {
[INFO] [stdout] 25 +     pub fn get_cell(&self, x: u32, y: u32) -> Option<&Cell> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.29s
[INFO] running `Command { std: "docker" "inspect" "e25eaedc66b9f190fb40ae165e2edb140c1cec909d3ea264a72530d4cf2431b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e25eaedc66b9f190fb40ae165e2edb140c1cec909d3ea264a72530d4cf2431b4", kill_on_drop: false }`
[INFO] [stdout] e25eaedc66b9f190fb40ae165e2edb140c1cec909d3ea264a72530d4cf2431b4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d91fc6f5f7e359b12ab1d331a6049e58dc06a85cfafc07c02e01162792915eea
[INFO] running `Command { std: "docker" "start" "-a" "d91fc6f5f7e359b12ab1d331a6049e58dc06a85cfafc07c02e01162792915eea", kill_on_drop: false }`
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stdout] 
[INFO] [stderr]   --> src/mazebuilder/dfs.rs:86:74
[INFO] [stdout] running 9 tests
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stderr]    |                                                                          ^                     ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 86 - fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stderr] 86 + fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> (&'a Cell, Direction) {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/mazebuilder/dfs.rs:92:5
[INFO] [stderr]    |
[INFO] [stderr] 92 |     (chosen)
[INFO] [stderr]    |     ^      ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 92 -     (chosen)
[INFO] [stderr] 92 +     chosen
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/mazebuilder/maze.rs:25:54
[INFO] [stderr]    |
[INFO] [stderr] 25 |     pub fn get_cell(&self, x: u32, y: u32) -> Option<(&Cell)> {
[INFO] [stderr]    |                                                      ^     ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 25 -     pub fn get_cell(&self, x: u32, y: u32) -> Option<(&Cell)> {
[INFO] [stderr] 25 +     pub fn get_cell(&self, x: u32, y: u32) -> Option<&Cell> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: `mazegenerator` (lib) generated 3 warnings
[INFO] [stderr] warning: `mazegenerator` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/mazegenerator-71d8c524138109de)
[INFO] [stdout] test mazebuilder::tests::test_dfs_15_23 ... ok
[INFO] [stdout] test mazebuilder::tests::test_dfs_10_10 ... ok
[INFO] [stdout] test mazebuilder::tests::test_generate_maze_selector ... ok
[INFO] [stdout] test mazebuilder::tests::test_kruskal_10_10 ... ok
[INFO] [stdout] test mazebuilder::tests::test_kruskal_15_23 ... ok
[INFO] [stdout] test mazebuilder::tests::test_dfs_imperfect ... ok
[INFO] [stdout] test mazebuilder::tests::test_dfs_100_100 ... ok
[INFO] [stdout] test mazebuilder::tests::test_kruskal_imperfect ... ok
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/mazegenerator-80f49e44bda4eb47)
[INFO] [stdout] test mazebuilder::tests::test_kruskal_100_100 ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.16s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mazegenerator
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stdout] 
[INFO] [stderr]   --> /opt/rustwide/workdir/src/mazebuilder/dfs.rs:86:74
[INFO] [stdout] running 0 tests
[INFO] [stderr]    |
[INFO] [stdout] 
[INFO] [stderr] 86 | fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    |                                                                          ^                     ^
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 86 - fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stderr] 86 + fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> (&'a Cell, Direction) {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> /opt/rustwide/workdir/src/mazebuilder/dfs.rs:92:5
[INFO] [stderr]    |
[INFO] [stderr] 92 |     (chosen)
[INFO] [stderr]    |     ^      ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 92 -     (chosen)
[INFO] [stderr] 92 +     chosen
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> /opt/rustwide/workdir/src/mazebuilder/maze.rs:25:54
[INFO] [stderr]    |
[INFO] [stderr] 25 |     pub fn get_cell(&self, x: u32, y: u32) -> Option<(&Cell)> {
[INFO] [stderr]    |                                                      ^     ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 25 -     pub fn get_cell(&self, x: u32, y: u32) -> Option<(&Cell)> {
[INFO] [stderr] 25 +     pub fn get_cell(&self, x: u32, y: u32) -> Option<&Cell> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] running `Command { std: "docker" "inspect" "d91fc6f5f7e359b12ab1d331a6049e58dc06a85cfafc07c02e01162792915eea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d91fc6f5f7e359b12ab1d331a6049e58dc06a85cfafc07c02e01162792915eea", kill_on_drop: false }`
[INFO] [stdout] d91fc6f5f7e359b12ab1d331a6049e58dc06a85cfafc07c02e01162792915eea