[INFO] cloning repository https://github.com/TrueDoctor/mastermind_solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TrueDoctor/mastermind_solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTrueDoctor%2Fmastermind_solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTrueDoctor%2Fmastermind_solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0d12bc506dad282a60710536591474363fbff53b
[INFO] checking TrueDoctor/mastermind_solver against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTrueDoctor%2Fmastermind_solver" "/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/TrueDoctor/mastermind_solver 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/TrueDoctor/mastermind_solver
[INFO] finished tweaking git repo https://github.com/TrueDoctor/mastermind_solver
[INFO] tweaked toml for git repo https://github.com/TrueDoctor/mastermind_solver written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/TrueDoctor/mastermind_solver 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] 65bb487e6ffe7945c715b30ce15165b1ffa9e9de2e83892998f183f1fe00cb6d
[INFO] running `Command { std: "docker" "start" "-a" "65bb487e6ffe7945c715b30ce15165b1ffa9e9de2e83892998f183f1fe00cb6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "65bb487e6ffe7945c715b30ce15165b1ffa9e9de2e83892998f183f1fe00cb6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65bb487e6ffe7945c715b30ce15165b1ffa9e9de2e83892998f183f1fe00cb6d", kill_on_drop: false }`
[INFO] [stdout] 65bb487e6ffe7945c715b30ce15165b1ffa9e9de2e83892998f183f1fe00cb6d
[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] c8bb1fc457244b05fccf22552e5f57ffa3b2d2b5eef565220a85a20a16669293
[INFO] running `Command { std: "docker" "start" "-a" "c8bb1fc457244b05fccf22552e5f57ffa3b2d2b5eef565220a85a20a16669293", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.11
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking once_cell v1.13.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.10
[INFO] [stderr]    Compiling libc v0.2.131
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]    Compiling rayon v1.5.3
[INFO] [stderr]     Checking either v1.7.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.6
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.2
[INFO] [stderr]     Checking mastermind_solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `DummyGuesser` is never constructed
[INFO] [stdout]    --> src/main.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 | struct DummyGuesser<const FIELDS: usize>;
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `interactive` is never used
[INFO] [stdout]    --> src/main.rs:242:4
[INFO] [stdout]     |
[INFO] [stdout] 242 | fn interactive() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `interactive` is never used
[INFO] [stdout]    --> src/main.rs:242:4
[INFO] [stdout]     |
[INFO] [stdout] 242 | fn interactive() {
[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" "c8bb1fc457244b05fccf22552e5f57ffa3b2d2b5eef565220a85a20a16669293", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8bb1fc457244b05fccf22552e5f57ffa3b2d2b5eef565220a85a20a16669293", kill_on_drop: false }`
[INFO] [stdout] c8bb1fc457244b05fccf22552e5f57ffa3b2d2b5eef565220a85a20a16669293
[INFO] checking TrueDoctor/mastermind_solver against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTrueDoctor%2Fmastermind_solver" "/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/TrueDoctor/mastermind_solver on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/TrueDoctor/mastermind_solver
[INFO] finished tweaking git repo https://github.com/TrueDoctor/mastermind_solver
[INFO] tweaked toml for git repo https://github.com/TrueDoctor/mastermind_solver written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/TrueDoctor/mastermind_solver 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c120812a4e8d7ef3cf4e5bedbd8a9b236b016b638ba68d8d8247f5b2e9152d9e
[INFO] running `Command { std: "docker" "start" "-a" "c120812a4e8d7ef3cf4e5bedbd8a9b236b016b638ba68d8d8247f5b2e9152d9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c120812a4e8d7ef3cf4e5bedbd8a9b236b016b638ba68d8d8247f5b2e9152d9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c120812a4e8d7ef3cf4e5bedbd8a9b236b016b638ba68d8d8247f5b2e9152d9e", kill_on_drop: false }`
[INFO] [stdout] c120812a4e8d7ef3cf4e5bedbd8a9b236b016b638ba68d8d8247f5b2e9152d9e
[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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d811ce630d95de40f97f12420de5eda3ae92acf50f76648fab95247caf4cdd80
[INFO] running `Command { std: "docker" "start" "-a" "d811ce630d95de40f97f12420de5eda3ae92acf50f76648fab95247caf4cdd80", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.11
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking once_cell v1.13.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.10
[INFO] [stderr]    Compiling libc v0.2.131
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]    Compiling rayon v1.5.3
[INFO] [stderr]     Checking either v1.7.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.6
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.2
[INFO] [stderr]     Checking mastermind_solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `DummyGuesser` is never constructed
[INFO] [stdout]    --> src/main.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 | struct DummyGuesser<const FIELDS: usize>;
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `interactive` is never used
[INFO] [stdout]    --> src/main.rs:242:4
[INFO] [stdout]     |
[INFO] [stdout] 242 | fn interactive() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `interactive` is never used
[INFO] [stdout]    --> src/main.rs:242:4
[INFO] [stdout]     |
[INFO] [stdout] 242 | fn interactive() {
[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 5.33s
[INFO] running `Command { std: "docker" "inspect" "d811ce630d95de40f97f12420de5eda3ae92acf50f76648fab95247caf4cdd80", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d811ce630d95de40f97f12420de5eda3ae92acf50f76648fab95247caf4cdd80", kill_on_drop: false }`
[INFO] [stdout] d811ce630d95de40f97f12420de5eda3ae92acf50f76648fab95247caf4cdd80