[INFO] fetching crate maze_rs 1.0.0...
[INFO] testing maze_rs-1.0.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate maze_rs 1.0.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate maze_rs 1.0.0 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 crates.io crate maze_rs 1.0.0
[INFO] finished tweaking crates.io crate maze_rs 1.0.0
[INFO] tweaked toml for crates.io crate maze_rs 1.0.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate maze_rs 1.0.0 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-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" "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] 5ae139d4f5fac0951e0128d717059cc7abdec7b40b4e777739059a4a5c4d6063
[INFO] running `Command { std: "docker" "start" "-a" "5ae139d4f5fac0951e0128d717059cc7abdec7b40b4e777739059a4a5c4d6063", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5ae139d4f5fac0951e0128d717059cc7abdec7b40b4e777739059a4a5c4d6063", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ae139d4f5fac0951e0128d717059cc7abdec7b40b4e777739059a4a5c4d6063", kill_on_drop: false }`
[INFO] [stdout] 5ae139d4f5fac0951e0128d717059cc7abdec7b40b4e777739059a4a5c4d6063
[INFO] running `Command { std: "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" "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] dfb1de0d3b437457b842fbe1cefc0b44ef56dd5cb1c6415d5817a2ab5dce7328
[INFO] running `Command { std: "docker" "start" "-a" "dfb1de0d3b437457b842fbe1cefc0b44ef56dd5cb1c6415d5817a2ab5dce7328", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling maze_rs v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/error/mod.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     kind: ErrorKind,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `v`
[INFO] [stdout]    --> src/ds/graphs.rs:164:5
[INFO] [stdout]     |
[INFO] [stdout] 164 |     v: usize,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.90s
[INFO] running `Command { std: "docker" "inspect" "dfb1de0d3b437457b842fbe1cefc0b44ef56dd5cb1c6415d5817a2ab5dce7328", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfb1de0d3b437457b842fbe1cefc0b44ef56dd5cb1c6415d5817a2ab5dce7328", kill_on_drop: false }`
[INFO] [stdout] dfb1de0d3b437457b842fbe1cefc0b44ef56dd5cb1c6415d5817a2ab5dce7328
[INFO] running `Command { std: "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" "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] 609c253bca33c7fb907e4d2290fa79985401879b0cb8c345d5a8203e1db4734a
[INFO] running `Command { std: "docker" "start" "-a" "609c253bca33c7fb907e4d2290fa79985401879b0cb8c345d5a8203e1db4734a", kill_on_drop: false }`
[INFO] [stderr]    Compiling maze_rs v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/error/mod.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     kind: ErrorKind,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `v`
[INFO] [stdout]    --> src/ds/graphs.rs:164:5
[INFO] [stdout]     |
[INFO] [stdout] 164 |     v: usize,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `ds`
[INFO] [stdout]   --> src/helper/mod.rs:71:9
[INFO] [stdout]    |
[INFO] [stdout] 71 |     use ds::Point;
[INFO] [stdout]    |         ^^ help: a similar path exists: `crate::ds`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `use` statements changed in Rust 2018; read more at <https://doc.rust-lang.org/edition-guide/rust-2018/module-system/path-clarity.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `maze_rs` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "609c253bca33c7fb907e4d2290fa79985401879b0cb8c345d5a8203e1db4734a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "609c253bca33c7fb907e4d2290fa79985401879b0cb8c345d5a8203e1db4734a", kill_on_drop: false }`
[INFO] [stdout] 609c253bca33c7fb907e4d2290fa79985401879b0cb8c345d5a8203e1db4734a