[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 beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTheRiven%2Fmazegenerator" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TheRiven/mazegenerator on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", 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-7/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" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5bc36f18675fa5746b8bb52481feac532b9ba2517706e4bf6cf7cb4078ba3075
[INFO] running `Command { std: "docker" "start" "-a" "5bc36f18675fa5746b8bb52481feac532b9ba2517706e4bf6cf7cb4078ba3075", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5bc36f18675fa5746b8bb52481feac532b9ba2517706e4bf6cf7cb4078ba3075", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bc36f18675fa5746b8bb52481feac532b9ba2517706e4bf6cf7cb4078ba3075", kill_on_drop: false }`
[INFO] [stdout] 5bc36f18675fa5746b8bb52481feac532b9ba2517706e4bf6cf7cb4078ba3075
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 38ca17530fc20eeccde70ea7934435d81f7dab77dbd6b9b875beb0e803b07076
[INFO] running `Command { std: "docker" "start" "-a" "38ca17530fc20eeccde70ea7934435d81f7dab77dbd6b9b875beb0e803b07076", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.2
[INFO] [stderr]    Compiling adler32 v1.0.2
[INFO] [stderr]    Compiling either v1.4.0
[INFO] [stderr]    Compiling color_quant v1.0.0
[INFO] [stderr]    Compiling bitflags v1.0.1
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling arrayvec v0.4.7
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling gif v0.9.2
[INFO] [stderr]    Compiling deflate v0.7.17
[INFO] [stderr]    Compiling inflate v0.3.4
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.0
[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 num-iter v0.1.35
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[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]    |                                                                          ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[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]    |     ^^^^^^^^ help: remove these parentheses
[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]    |                                                      ^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 30.09s
[INFO] running `Command { std: "docker" "inspect" "38ca17530fc20eeccde70ea7934435d81f7dab77dbd6b9b875beb0e803b07076", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38ca17530fc20eeccde70ea7934435d81f7dab77dbd6b9b875beb0e803b07076", kill_on_drop: false }`
[INFO] [stdout] 38ca17530fc20eeccde70ea7934435d81f7dab77dbd6b9b875beb0e803b07076
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fc17ce72213c7e332b90d622df5c36ebd528ce87efa136c1a082ea4b5f4274ec
[INFO] running `Command { std: "docker" "start" "-a" "fc17ce72213c7e332b90d622df5c36ebd528ce87efa136c1a082ea4b5f4274ec", kill_on_drop: false }`
[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]    |                                                                          ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[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]    |     ^^^^^^^^ help: remove these parentheses
[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]    |                                                      ^^^^^^^ help: remove these parentheses
[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]    |                                                                          ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[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]    |     ^^^^^^^^ help: remove these parentheses
[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]    |                                                      ^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.80s
[INFO] running `Command { std: "docker" "inspect" "fc17ce72213c7e332b90d622df5c36ebd528ce87efa136c1a082ea4b5f4274ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc17ce72213c7e332b90d622df5c36ebd528ce87efa136c1a082ea4b5f4274ec", kill_on_drop: false }`
[INFO] [stdout] fc17ce72213c7e332b90d622df5c36ebd528ce87efa136c1a082ea4b5f4274ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 742658c57e8a06a4e4e6d2cb11ea8d99c2abb5c30eaa433f2179974f8099d888
[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" "742658c57e8a06a4e4e6d2cb11ea8d99c2abb5c30eaa433f2179974f8099d888", kill_on_drop: false }`
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/mazebuilder/dfs.rs:86:74
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stderr]    |                                                                          ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[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]    |     ^^^^^^^^ help: remove these parentheses
[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]    |                                                      ^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/mazebuilder/dfs.rs:86:74
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stderr]    |                                                                          ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[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]    |     ^^^^^^^^ help: remove these parentheses
[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]    |                                                      ^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.10s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/mazegenerator-6bcd4b7f5d31621d
[INFO] [stdout] 
[INFO] [stdout] running 9 tests
[INFO] [stdout] test mazebuilder::tests::test_dfs_15_23 ... ok
[INFO] [stdout] test mazebuilder::tests::test_generate_maze_selector ... ok
[INFO] [stdout] test mazebuilder::tests::test_dfs_10_10 ... ok
[INFO] [stdout] test mazebuilder::tests::test_kruskal_15_23 ... ok
[INFO] [stdout] test mazebuilder::tests::test_kruskal_10_10 ... ok
[INFO] [stdout] test mazebuilder::tests::test_dfs_100_100 ... ok
[INFO] [stdout] test mazebuilder::tests::test_dfs_imperfect ... ok
[INFO] [stdout] test mazebuilder::tests::test_kruskal_100_100 ... ok
[INFO] [stdout] test mazebuilder::tests::test_kruskal_imperfect ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.30s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/mazegenerator-4e650d734831c268
[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]    Doc-tests mazegenerator
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> /opt/rustwide/workdir/src/mazebuilder/dfs.rs:86:74
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn pick_random_neighbour<'a>(neighbours: &Vec<(&'a Cell, Direction)>) -> ((&'a Cell, Direction)) {
[INFO] [stderr]    |                                                                          ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[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]    |     ^^^^^^^^ help: remove these parentheses
[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]    |                                                      ^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[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] running `Command { std: "docker" "inspect" "742658c57e8a06a4e4e6d2cb11ea8d99c2abb5c30eaa433f2179974f8099d888", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "742658c57e8a06a4e4e6d2cb11ea8d99c2abb5c30eaa433f2179974f8099d888", kill_on_drop: false }`
[INFO] [stdout] 742658c57e8a06a4e4e6d2cb11ea8d99c2abb5c30eaa433f2179974f8099d888