[INFO] cloning repository https://github.com/cicvedu/rustlings-semester-2-WEIR-ZHONG [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cicvedu/rustlings-semester-2-WEIR-ZHONG" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcicvedu%2Frustlings-semester-2-WEIR-ZHONG", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcicvedu%2Frustlings-semester-2-WEIR-ZHONG'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 89ee6ae57c312f6f1b14d5262a41e806b8da142e [INFO] checking cicvedu/rustlings-semester-2-WEIR-ZHONG against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcicvedu%2Frustlings-semester-2-WEIR-ZHONG" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/cicvedu/rustlings-semester-2-WEIR-ZHONG 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/cicvedu/rustlings-semester-2-WEIR-ZHONG [INFO] finished tweaking git repo https://github.com/cicvedu/rustlings-semester-2-WEIR-ZHONG [INFO] tweaked toml for git repo https://github.com/cicvedu/rustlings-semester-2-WEIR-ZHONG written to /workspace/builds/worker-5-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/cicvedu/rustlings-semester-2-WEIR-ZHONG 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-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 9862706f0af8592cbfbd31f3f0c4cfeed8be28901aab57fa592a9623e8fadfe3 [INFO] running `Command { std: "docker" "start" "-a" "9862706f0af8592cbfbd31f3f0c4cfeed8be28901aab57fa592a9623e8fadfe3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "9862706f0af8592cbfbd31f3f0c4cfeed8be28901aab57fa592a9623e8fadfe3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "9862706f0af8592cbfbd31f3f0c4cfeed8be28901aab57fa592a9623e8fadfe3", kill_on_drop: false }` [INFO] [stdout] 9862706f0af8592cbfbd31f3f0c4cfeed8be28901aab57fa592a9623e8fadfe3 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 9417b52acff5f26ce37cf6f4ec547ee795f2b6c35b13eb4ec25aad1ccacf994d [INFO] running `Command { std: "docker" "start" "-a" "9417b52acff5f26ce37cf6f4ec547ee795f2b6c35b13eb4ec25aad1ccacf994d", kill_on_drop: false }` [INFO] [stderr] Checking rustlings v5.5.1 (/opt/rustwide/workdir) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.49s [INFO] running `Command { std: "docker" "inspect" "9417b52acff5f26ce37cf6f4ec547ee795f2b6c35b13eb4ec25aad1ccacf994d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "9417b52acff5f26ce37cf6f4ec547ee795f2b6c35b13eb4ec25aad1ccacf994d", kill_on_drop: false }` [INFO] [stdout] 9417b52acff5f26ce37cf6f4ec547ee795f2b6c35b13eb4ec25aad1ccacf994d [INFO] checking cicvedu/rustlings-semester-2-WEIR-ZHONG against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcicvedu%2Frustlings-semester-2-WEIR-ZHONG" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/cicvedu/rustlings-semester-2-WEIR-ZHONG 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/cicvedu/rustlings-semester-2-WEIR-ZHONG [INFO] finished tweaking git repo https://github.com/cicvedu/rustlings-semester-2-WEIR-ZHONG [INFO] tweaked toml for git repo https://github.com/cicvedu/rustlings-semester-2-WEIR-ZHONG written to /workspace/builds/worker-5-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/cicvedu/rustlings-semester-2-WEIR-ZHONG 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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 309fbfa4eb3b3977555c090398f339a03f0164831e10e0aa1bdad807e6100ddd [INFO] running `Command { std: "docker" "start" "-a" "309fbfa4eb3b3977555c090398f339a03f0164831e10e0aa1bdad807e6100ddd", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "309fbfa4eb3b3977555c090398f339a03f0164831e10e0aa1bdad807e6100ddd", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "309fbfa4eb3b3977555c090398f339a03f0164831e10e0aa1bdad807e6100ddd", kill_on_drop: false }` [INFO] [stdout] 309fbfa4eb3b3977555c090398f339a03f0164831e10e0aa1bdad807e6100ddd [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 2e102c1314ead6391770e059bd7080695934693a36ab02c30682971b3684efbb [INFO] running `Command { std: "docker" "start" "-a" "2e102c1314ead6391770e059bd7080695934693a36ab02c30682971b3684efbb", kill_on_drop: false }` [INFO] [stderr] Checking rustlings v5.5.1 (/opt/rustwide/workdir) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.47s [INFO] running `Command { std: "docker" "inspect" "2e102c1314ead6391770e059bd7080695934693a36ab02c30682971b3684efbb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "2e102c1314ead6391770e059bd7080695934693a36ab02c30682971b3684efbb", kill_on_drop: false }` [INFO] [stdout] 2e102c1314ead6391770e059bd7080695934693a36ab02c30682971b3684efbb