[INFO] updating cached repository https://github.com/nbardiuk/mazes
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 888a96302611db487c41fcf8f050032ddf535b44
[INFO] testing nbardiuk/mazes against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnbardiuk%2Fmazes" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nbardiuk/mazes on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/nbardiuk/mazes
[INFO] finished tweaking git repo https://github.com/nbardiuk/mazes
[INFO] tweaked toml for git repo https://github.com/nbardiuk/mazes written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/nbardiuk/mazes already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "build" "--frozen"`
[INFO] [stdout] 7bd68142cbffbfe39f2cbf5bd8528cd4af4096acddaeacf0e7bc1548023047a7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "7bd68142cbffbfe39f2cbf5bd8528cd4af4096acddaeacf0e7bc1548023047a7"`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling svg v0.6.0
[INFO] [stderr]    Compiling c2-chacha v0.2.2
[INFO] [stderr]    Compiling getrandom v0.1.12
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.2
[INFO] [stderr]    Compiling mazes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]  --> src/binary_tree.rs:4:24
[INFO] [stderr]   |
[INFO] [stderr] 4 | use rand::{thread_rng, Rng};
[INFO] [stderr]   |                        ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/maze.rs:175:13
[INFO] [stderr]     |
[INFO] [stderr] 175 |         for x in 0..self.width {
[INFO] [stderr]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `BinaryTree`
[INFO] [stderr]  --> src/binary_tree.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct BinaryTree;
[INFO] [stderr]   |            ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `on`
[INFO] [stderr]  --> src/binary_tree.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     pub fn on(mut maze: Maze) -> Maze {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `links`
[INFO] [stderr]   --> src/maze.rs:92:5
[INFO] [stderr]    |
[INFO] [stderr] 92 |     pub fn links(&self, cell: &Cell) -> Vec<Cell> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.12s
[INFO] running `"docker" "inspect" "7bd68142cbffbfe39f2cbf5bd8528cd4af4096acddaeacf0e7bc1548023047a7"`
[INFO] running `"docker" "rm" "-f" "7bd68142cbffbfe39f2cbf5bd8528cd4af4096acddaeacf0e7bc1548023047a7"`
[INFO] [stdout] 7bd68142cbffbfe39f2cbf5bd8528cd4af4096acddaeacf0e7bc1548023047a7
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 80a218c89b6a233b943aa6dfe15dd9c34ef9a088150ddd967709ac2beef1f1cf
[INFO] running `"docker" "start" "-a" "80a218c89b6a233b943aa6dfe15dd9c34ef9a088150ddd967709ac2beef1f1cf"`
[INFO] [stderr]    Compiling mazes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]  --> src/binary_tree.rs:4:24
[INFO] [stderr]   |
[INFO] [stderr] 4 | use rand::{thread_rng, Rng};
[INFO] [stderr]   |                        ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/maze.rs:175:13
[INFO] [stderr]     |
[INFO] [stderr] 175 |         for x in 0..self.width {
[INFO] [stderr]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.29s
[INFO] running `"docker" "inspect" "80a218c89b6a233b943aa6dfe15dd9c34ef9a088150ddd967709ac2beef1f1cf"`
[INFO] running `"docker" "rm" "-f" "80a218c89b6a233b943aa6dfe15dd9c34ef9a088150ddd967709ac2beef1f1cf"`
[INFO] [stdout] 80a218c89b6a233b943aa6dfe15dd9c34ef9a088150ddd967709ac2beef1f1cf
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0d58303e8595f1741d7be10ba2fc54ac1131cf6e829a0aac96e64beb0183609d
[INFO] running `"docker" "start" "-a" "0d58303e8595f1741d7be10ba2fc54ac1131cf6e829a0aac96e64beb0183609d"`
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]  --> src/binary_tree.rs:4:24
[INFO] [stderr]   |
[INFO] [stderr] 4 | use rand::{thread_rng, Rng};
[INFO] [stderr]   |                        ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/maze.rs:175:13
[INFO] [stderr]     |
[INFO] [stderr] 175 |         for x in 0..self.width {
[INFO] [stderr]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.12s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/mazes-1f82acaca6de1687
[INFO] [stdout] 
[INFO] [stdout] running 15 tests
[INFO] [stdout] test maze::spec::display_singleton_maze ... ok
[INFO] [stdout] test binary_tree::spec::binary_tree_does_nothing_on_empty_maze ... ok
[INFO] [stdout] test maze::spec::display_maze_without_links ... ok
[INFO] [stdout] test maze::spec::maze_knows_cell_neighbours ... ok
[INFO] [stdout] test maze::spec::maze_provides_cells ... ok
[INFO] [stdout] test maze::spec::maze_provides_rows ... ok
[INFO] [stdout] test maze::spec::maze_cell_neighbours_on_edge ... ok
[INFO] [stdout] test maze::spec::maze_links_cells ... ok
[INFO] [stdout] test binary_tree::spec::binary_tree_does_nothing_on_singleton_maze ... ok
[INFO] [stdout] test maze::spec::display_maze_with_links ... ok
[INFO] [stdout] test maze::spec::empty_maze_has_no_cells ... ok
[INFO] [stdout] test sidewinder::spec::sidewinder_does_nothing_on_empty_maze ... ok
[INFO] [stdout] test sidewinder::spec::sidewinder_tree_does_nothing_on_singleton_maze ... ok
[INFO] [stdout] test binary_tree::spec::binary_tree_connects_every_cell_of_maze ... ok
[INFO] [stdout] test sidewinder::spec::sidewinder_tree_connects_every_cell_of_maze ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 15 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "0d58303e8595f1741d7be10ba2fc54ac1131cf6e829a0aac96e64beb0183609d"`
[INFO] running `"docker" "rm" "-f" "0d58303e8595f1741d7be10ba2fc54ac1131cf6e829a0aac96e64beb0183609d"`
[INFO] [stdout] 0d58303e8595f1741d7be10ba2fc54ac1131cf6e829a0aac96e64beb0183609d