[INFO] cloning repository https://github.com/sweepline/knights_tour [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sweepline/knights_tour" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsweepline%2Fknights_tour", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsweepline%2Fknights_tour'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 4be8192e111ab2cd27ca12f45c5bba32e185b38d [INFO] checking sweepline/knights_tour against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsweepline%2Fknights_tour" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/sweepline/knights_tour on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/sweepline/knights_tour [INFO] finished tweaking git repo https://github.com/sweepline/knights_tour [INFO] tweaked toml for git repo https://github.com/sweepline/knights_tour written to /workspace/builds/worker-4-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/sweepline/knights_tour 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 92f96e932e50732e3b63dbdb7d68b2b0460321492884693dc79c3fd5a00d6015 [INFO] running `Command { std: "docker" "start" "-a" "92f96e932e50732e3b63dbdb7d68b2b0460321492884693dc79c3fd5a00d6015", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "92f96e932e50732e3b63dbdb7d68b2b0460321492884693dc79c3fd5a00d6015", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "92f96e932e50732e3b63dbdb7d68b2b0460321492884693dc79c3fd5a00d6015", kill_on_drop: false }` [INFO] [stdout] 92f96e932e50732e3b63dbdb7d68b2b0460321492884693dc79c3fd5a00d6015 [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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] ce9fac23d1f6c15af204c6f427f865010738729435bb80371932696b7513890c [INFO] running `Command { std: "docker" "start" "-a" "ce9fac23d1f6c15af204c6f427f865010738729435bb80371932696b7513890c", kill_on_drop: false }` [INFO] [stderr] Compiling crossbeam-utils v0.8.15 [INFO] [stderr] Compiling memoffset v0.8.0 [INFO] [stderr] Compiling crossbeam-epoch v0.9.14 [INFO] [stderr] Compiling libc v0.2.140 [INFO] [stderr] Checking scopeguard v1.1.0 [INFO] [stderr] Compiling rayon-core v1.11.0 [INFO] [stderr] Checking either v1.8.1 [INFO] [stderr] Checking crossbeam-channel v0.5.7 [INFO] [stderr] Checking crossbeam-deque v0.8.3 [INFO] [stderr] Checking num_cpus v1.15.0 [INFO] [stderr] Checking rayon v1.7.0 [INFO] [stderr] Checking knights_tour v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: function `print_board` is never used [INFO] [stdout] --> src/main.rs:263:4 [INFO] [stdout] | [INFO] [stdout] 263 | fn print_board(pos: &u8, visited: &Visited) { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_board` is never used [INFO] [stdout] --> src/main.rs:263:4 [INFO] [stdout] | [INFO] [stdout] 263 | fn print_board(pos: &u8, visited: &Visited) { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.09s [INFO] running `Command { std: "docker" "inspect" "ce9fac23d1f6c15af204c6f427f865010738729435bb80371932696b7513890c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ce9fac23d1f6c15af204c6f427f865010738729435bb80371932696b7513890c", kill_on_drop: false }` [INFO] [stdout] ce9fac23d1f6c15af204c6f427f865010738729435bb80371932696b7513890c [INFO] checking sweepline/knights_tour against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsweepline%2Fknights_tour" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/sweepline/knights_tour on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/sweepline/knights_tour [INFO] finished tweaking git repo https://github.com/sweepline/knights_tour [INFO] tweaked toml for git repo https://github.com/sweepline/knights_tour written to /workspace/builds/worker-4-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/sweepline/knights_tour 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] d984cdcd30dd7af95b8e163f53a83c203ea162bc8370795264019849c2d164b9 [INFO] running `Command { std: "docker" "start" "-a" "d984cdcd30dd7af95b8e163f53a83c203ea162bc8370795264019849c2d164b9", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "d984cdcd30dd7af95b8e163f53a83c203ea162bc8370795264019849c2d164b9", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d984cdcd30dd7af95b8e163f53a83c203ea162bc8370795264019849c2d164b9", kill_on_drop: false }` [INFO] [stdout] d984cdcd30dd7af95b8e163f53a83c203ea162bc8370795264019849c2d164b9 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] cb50b15776d88607a03589e64d715bce1a1e242d00cd52725d3b8609da9f4263 [INFO] running `Command { std: "docker" "start" "-a" "cb50b15776d88607a03589e64d715bce1a1e242d00cd52725d3b8609da9f4263", kill_on_drop: false }` [INFO] [stderr] Compiling crossbeam-utils v0.8.15 [INFO] [stderr] Compiling memoffset v0.8.0 [INFO] [stderr] Compiling crossbeam-epoch v0.9.14 [INFO] [stderr] Compiling libc v0.2.140 [INFO] [stderr] Checking scopeguard v1.1.0 [INFO] [stderr] Compiling rayon-core v1.11.0 [INFO] [stderr] Checking either v1.8.1 [INFO] [stderr] Checking crossbeam-channel v0.5.7 [INFO] [stderr] Checking crossbeam-deque v0.8.3 [INFO] [stderr] Checking num_cpus v1.15.0 [INFO] [stderr] Checking rayon v1.7.0 [INFO] [stderr] Checking knights_tour v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: function `print_board` is never used [INFO] [stdout] --> src/main.rs:263:4 [INFO] [stdout] | [INFO] [stdout] 263 | fn print_board(pos: &u8, visited: &Visited) { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_board` is never used [INFO] [stdout] --> src/main.rs:263:4 [INFO] [stdout] | [INFO] [stdout] 263 | fn print_board(pos: &u8, visited: &Visited) { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.58s [INFO] running `Command { std: "docker" "inspect" "cb50b15776d88607a03589e64d715bce1a1e242d00cd52725d3b8609da9f4263", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "cb50b15776d88607a03589e64d715bce1a1e242d00cd52725d3b8609da9f4263", kill_on_drop: false }` [INFO] [stdout] cb50b15776d88607a03589e64d715bce1a1e242d00cd52725d3b8609da9f4263