[INFO] cloning repository https://github.com/nbardiuk/mazes
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nbardiuk/mazes" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnbardiuk%2Fmazes", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnbardiuk%2Fmazes'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 888a96302611db487c41fcf8f050032ddf535b44
[INFO] testing nbardiuk/mazes against try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_getrandom_patch_2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnbardiuk%2Fmazes" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[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-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nbardiuk/mazes on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nbardiuk/mazes already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded c2-chacha v0.2.2
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.5
[INFO] [stderr]   Downloaded svg v0.6.0
[INFO] [stderr]   Downloaded wasi v0.7.0
[INFO] [stderr]   Downloaded rand v0.7.2
[INFO] [stderr]   Downloaded getrandom v0.1.12
[INFO] [stderr]   Downloaded libc v0.2.62
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ad2bd75dea9f1258c356aa3e9f12a171513496e621e51575923d30fb3b7c68fa
[INFO] running `Command { std: "docker" "start" "-a" "ad2bd75dea9f1258c356aa3e9f12a171513496e621e51575923d30fb3b7c68fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad2bd75dea9f1258c356aa3e9f12a171513496e621e51575923d30fb3b7c68fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad2bd75dea9f1258c356aa3e9f12a171513496e621e51575923d30fb3b7c68fa", kill_on_drop: false }`
[INFO] [stdout] ad2bd75dea9f1258c356aa3e9f12a171513496e621e51575923d30fb3b7c68fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 77e28669724f72d4a5bf780456bdd00ce19453696fc2864691f0fe7b8ee1542e
[INFO] running `Command { std: "docker" "start" "-a" "77e28669724f72d4a5bf780456bdd00ce19453696fc2864691f0fe7b8ee1542e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling getrandom v0.1.12
[INFO] [stderr]    Compiling ppv-lite86 v0.2.5
[INFO] [stderr]    Compiling svg v0.6.0
[INFO] [stderr]    Compiling c2-chacha v0.2.2
[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] [stdout] warning: unused import: `Rng`
[INFO] [stdout]  --> src/binary_tree.rs:4:24
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::{thread_rng, Rng};
[INFO] [stdout]   |                        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/maze.rs:175:13
[INFO] [stdout]     |
[INFO] [stdout] 175 |         for x in 0..self.width {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BinaryTree` is never constructed
[INFO] [stdout]  --> src/binary_tree.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct BinaryTree;
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `on` is never used
[INFO] [stdout]  --> src/binary_tree.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl BinaryTree {
[INFO] [stdout]   | --------------- associated function in this implementation
[INFO] [stdout] 8 |     pub fn on(mut maze: Maze) -> Maze {
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `links` is never used
[INFO] [stdout]   --> src/maze.rs:92:12
[INFO] [stdout]    |
[INFO] [stdout] 32 | impl Maze {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 92 |     pub fn links(&self, cell: &Cell) -> Vec<Cell> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.60s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: svg v0.6.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "77e28669724f72d4a5bf780456bdd00ce19453696fc2864691f0fe7b8ee1542e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77e28669724f72d4a5bf780456bdd00ce19453696fc2864691f0fe7b8ee1542e", kill_on_drop: false }`
[INFO] [stdout] 77e28669724f72d4a5bf780456bdd00ce19453696fc2864691f0fe7b8ee1542e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "test" "--frozen" "--no-run" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] d1992d2eb0ad20fae7adb5a8edfe1efa9888be494c3fbbe12e15f21a27cc1258
[INFO] running `Command { std: "docker" "start" "-a" "d1992d2eb0ad20fae7adb5a8edfe1efa9888be494c3fbbe12e15f21a27cc1258", kill_on_drop: false }`
[INFO] [stderr]    Compiling mazes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Rng`
[INFO] [stdout]  --> src/binary_tree.rs:4:24
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::{thread_rng, Rng};
[INFO] [stdout]   |                        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/maze.rs:175:13
[INFO] [stdout]     |
[INFO] [stdout] 175 |         for x in 0..self.width {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.97s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: svg v0.6.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "d1992d2eb0ad20fae7adb5a8edfe1efa9888be494c3fbbe12e15f21a27cc1258", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1992d2eb0ad20fae7adb5a8edfe1efa9888be494c3fbbe12e15f21a27cc1258", kill_on_drop: false }`
[INFO] [stdout] d1992d2eb0ad20fae7adb5a8edfe1efa9888be494c3fbbe12e15f21a27cc1258
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "test" "--frozen" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 2000c6cadaa264715e3750799bf95b4018d314d32d977b089fd31764c169741d
[INFO] running `Command { std: "docker" "start" "-a" "2000c6cadaa264715e3750799bf95b4018d314d32d977b089fd31764c169741d", kill_on_drop: false }`
[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: `mazes` (bin "mazes" test) generated 2 warnings (run `cargo fix --bin "mazes" --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: svg v0.6.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/x86_64-unknown-linux-musl/debug/deps/mazes-38ebdcd70aab6fc5)
[INFO] [stdout] 
[INFO] [stdout] running 15 tests
[INFO] [stdout] test binary_tree::spec::binary_tree_does_nothing_on_empty_maze ... ok
[INFO] [stdout] test binary_tree::spec::binary_tree_does_nothing_on_singleton_maze ... ok
[INFO] [stdout] test maze::spec::display_singleton_maze ... ok
[INFO] [stdout] test maze::spec::display_maze_without_links ... ok
[INFO] [stdout] test maze::spec::display_maze_with_links ... ok
[INFO] [stdout] test maze::spec::maze_cell_neighbours_on_edge ... ok
[INFO] [stdout] test maze::spec::maze_knows_cell_neighbours ... ok
[INFO] [stdout] test maze::spec::empty_maze_has_no_cells ... ok
[INFO] [stdout] test maze::spec::maze_links_cells ... ok
[INFO] [stdout] test maze::spec::maze_provides_cells ... ok
[INFO] [stdout] test maze::spec::maze_provides_rows ... ok
[INFO] [stdout] test sidewinder::spec::sidewinder_tree_does_nothing_on_singleton_maze ... ok
[INFO] [stdout] test sidewinder::spec::sidewinder_does_nothing_on_empty_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; finished in 0.01s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "2000c6cadaa264715e3750799bf95b4018d314d32d977b089fd31764c169741d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2000c6cadaa264715e3750799bf95b4018d314d32d977b089fd31764c169741d", kill_on_drop: false }`
[INFO] [stdout] 2000c6cadaa264715e3750799bf95b4018d314d32d977b089fd31764c169741d