[INFO] cloning repository https://github.com/bruce/rust-mazes
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bruce/rust-mazes" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbruce%2Frust-mazes", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbruce%2Frust-mazes'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 678739609b4cc22ca4c08e98f2c38976f34c77cf
[INFO] testing bruce/rust-mazes against try#d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2 for pr-86479
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbruce%2Frust-mazes" "/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/bruce/rust-mazes on toolchain d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bruce/rust-mazes
[INFO] finished tweaking git repo https://github.com/bruce/rust-mazes
[INFO] tweaked toml for git repo https://github.com/bruce/rust-mazes written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/bruce/rust-mazes already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "fetch" "--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 49c05c66a7bc2cee08619e447c1fe0d8e72bd5c81a57073b15e6c5f60fafa787
[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" "49c05c66a7bc2cee08619e447c1fe0d8e72bd5c81a57073b15e6c5f60fafa787", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "49c05c66a7bc2cee08619e447c1fe0d8e72bd5c81a57073b15e6c5f60fafa787", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49c05c66a7bc2cee08619e447c1fe0d8e72bd5c81a57073b15e6c5f60fafa787", kill_on_drop: false }`
[INFO] [stdout] 49c05c66a7bc2cee08619e447c1fe0d8e72bd5c81a57073b15e6c5f60fafa787
[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=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" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1aa09ddea10ab61e6754f7123a3b37d4d2f2026b0a1331ad1d8a15fbc09bea24
[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" "1aa09ddea10ab61e6754f7123a3b37d4d2f2026b0a1331ad1d8a15fbc09bea24", kill_on_drop: false }`
[INFO] [stderr]    Compiling mazes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/grid.rs:22:20
[INFO] [stdout]    |
[INFO] [stdout] 22 |         for col in (1..cols) {
[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 `for` iterator expression
[INFO] [stdout]   --> src/grid.rs:24:24
[INFO] [stdout]    |
[INFO] [stdout] 24 |             for row in (1..rows) {
[INFO] [stdout]    |                        ^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.18s
[INFO] running `Command { std: "docker" "inspect" "1aa09ddea10ab61e6754f7123a3b37d4d2f2026b0a1331ad1d8a15fbc09bea24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1aa09ddea10ab61e6754f7123a3b37d4d2f2026b0a1331ad1d8a15fbc09bea24", kill_on_drop: false }`
[INFO] [stdout] 1aa09ddea10ab61e6754f7123a3b37d4d2f2026b0a1331ad1d8a15fbc09bea24
[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=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" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "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] b1ec3764a6727fa7852d408cfa3119a87236a28d61bcd4f52d161933cc1fa7ce
[INFO] running `Command { std: "docker" "start" "-a" "b1ec3764a6727fa7852d408cfa3119a87236a28d61bcd4f52d161933cc1fa7ce", kill_on_drop: false }`
[INFO] [stderr]    Compiling mazes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/grid.rs:22:20
[INFO] [stdout]    |
[INFO] [stdout] 22 |         for col in (1..cols) {
[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 `for` iterator expression
[INFO] [stdout]   --> src/grid.rs:24:24
[INFO] [stdout]    |
[INFO] [stdout] 24 |             for row in (1..rows) {
[INFO] [stdout]    |                        ^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/grid.rs:22:20
[INFO] [stdout]    |
[INFO] [stdout] 22 |         for col in (1..cols) {
[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 `for` iterator expression
[INFO] [stdout]   --> src/grid.rs:24:24
[INFO] [stdout]    |
[INFO] [stdout] 24 |             for row in (1..rows) {
[INFO] [stdout]    |                        ^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.93s
[INFO] running `Command { std: "docker" "inspect" "b1ec3764a6727fa7852d408cfa3119a87236a28d61bcd4f52d161933cc1fa7ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1ec3764a6727fa7852d408cfa3119a87236a28d61bcd4f52d161933cc1fa7ce", kill_on_drop: false }`
[INFO] [stdout] b1ec3764a6727fa7852d408cfa3119a87236a28d61bcd4f52d161933cc1fa7ce
[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=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" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f890d7d0ad86bced92cd259b3b9e838f645479675a85baee744855862bc51f40
[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" "f890d7d0ad86bced92cd259b3b9e838f645479675a85baee744855862bc51f40", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout] running 2 tests
[INFO] [stderr]   --> src/grid.rs:22:20
[INFO] [stdout] test test::grid_cell ... ok
[INFO] [stderr]    |
[INFO] [stderr] 22 |         for col in (1..cols) {
[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 `for` iterator expression
[INFO] [stderr]   --> src/grid.rs:24:24
[INFO] [stderr]    |
[INFO] [stderr] 24 |             for row in (1..rows) {
[INFO] [stderr]    |                        ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: `mazes` (lib) generated 2 warnings
[INFO] [stderr] warning: `mazes` (lib test) generated 2 warnings (2 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/mazes-674f7abf68d80b8d)
[INFO] [stdout] test test::grid_new ... ok
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/mazes-c6418839ac430404)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mazes
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[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 `for` iterator expression
[INFO] [stderr]   --> /opt/rustwide/workdir/src/grid.rs:22:20
[INFO] [stderr]    |
[INFO] [stderr] 22 |         for col in (1..cols) {
[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 `for` iterator expression
[INFO] [stderr]   --> /opt/rustwide/workdir/src/grid.rs:24:24
[INFO] [stderr]    |
[INFO] [stderr] 24 |             for row in (1..rows) {
[INFO] [stderr]    |                        ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: 2 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" "f890d7d0ad86bced92cd259b3b9e838f645479675a85baee744855862bc51f40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f890d7d0ad86bced92cd259b3b9e838f645479675a85baee744855862bc51f40", kill_on_drop: false }`
[INFO] [stdout] f890d7d0ad86bced92cd259b3b9e838f645479675a85baee744855862bc51f40