[INFO] cloning repository https://github.com/cicvedu/rustlings-semester-2-z071230116 [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-z071230116" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcicvedu%2Frustlings-semester-2-z071230116", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcicvedu%2Frustlings-semester-2-z071230116'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] d0dfb1531664642dfc4c0ce12e989bcc956ee8c8 [INFO] checking cicvedu/rustlings-semester-2-z071230116 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-z071230116" "/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/cicvedu/rustlings-semester-2-z071230116 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-z071230116 [INFO] finished tweaking git repo https://github.com/cicvedu/rustlings-semester-2-z071230116 [INFO] tweaked toml for git repo https://github.com/cicvedu/rustlings-semester-2-z071230116 written to /workspace/builds/worker-4-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/cicvedu/rustlings-semester-2-z071230116 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] 2b6ebc94d69365b8a0ae7bfa9e71c01ce49c265a0fc90b19de1e904cab31ebaf [INFO] running `Command { std: "docker" "start" "-a" "2b6ebc94d69365b8a0ae7bfa9e71c01ce49c265a0fc90b19de1e904cab31ebaf", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "2b6ebc94d69365b8a0ae7bfa9e71c01ce49c265a0fc90b19de1e904cab31ebaf", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "2b6ebc94d69365b8a0ae7bfa9e71c01ce49c265a0fc90b19de1e904cab31ebaf", kill_on_drop: false }` [INFO] [stdout] 2b6ebc94d69365b8a0ae7bfa9e71c01ce49c265a0fc90b19de1e904cab31ebaf [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] beb973ac87582971f41ca70d067511a509c1df16e49080d6cf8ab96cf688da04 [INFO] running `Command { std: "docker" "start" "-a" "beb973ac87582971f41ca70d067511a509c1df16e49080d6cf8ab96cf688da04", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.64 [INFO] [stderr] Compiling unicode-ident v1.0.10 [INFO] [stderr] Compiling quote v1.0.29 [INFO] [stderr] Compiling serde v1.0.171 [INFO] [stderr] Compiling slab v0.4.8 [INFO] [stderr] Compiling libc v0.2.147 [INFO] [stderr] Checking regex-syntax v0.7.4 [INFO] [stderr] Checking log v0.4.19 [INFO] [stderr] Compiling serde_json v1.0.102 [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Checking ryu v1.0.14 [INFO] [stderr] Checking aho-corasick v1.0.2 [INFO] [stderr] Checking smallvec v1.11.0 [INFO] [stderr] Checking itoa v1.0.8 [INFO] [stderr] Compiling tokio v1.29.1 [INFO] [stderr] Compiling argh_shared v0.1.10 [INFO] [stderr] Checking lazycell v1.3.0 [INFO] [stderr] Checking unicode-width v0.1.10 [INFO] [stderr] Compiling escargot v0.4.0 [INFO] [stderr] Checking predicates-core v1.0.6 [INFO] [stderr] Checking walkdir v2.3.3 [INFO] [stderr] Checking float-cmp v0.8.0 [INFO] [stderr] Checking pin-project-lite v0.2.10 [INFO] [stderr] Checking bytes v1.4.0 [INFO] [stderr] Checking termtree v0.4.1 [INFO] [stderr] Checking difference v2.0.0 [INFO] [stderr] Checking normalize-line-endings v0.3.0 [INFO] [stderr] Checking glob v0.3.1 [INFO] [stderr] Checking home v0.5.5 [INFO] [stderr] Checking predicates-tree v1.0.9 [INFO] [stderr] Checking net2 v0.2.39 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking inotify-sys v0.1.5 [INFO] [stderr] Checking parking_lot_core v0.9.8 [INFO] [stderr] Checking filetime v0.2.21 [INFO] [stderr] Checking socket2 v0.4.9 [INFO] [stderr] Checking signal-hook-registry v1.4.1 [INFO] [stderr] Checking num_cpus v1.16.0 [INFO] [stderr] Checking console v0.15.7 [INFO] [stderr] Checking mio v0.8.8 [INFO] [stderr] Checking inotify v0.7.1 [INFO] [stderr] Checking mio v0.6.23 [INFO] [stderr] Checking parking_lot v0.12.1 [INFO] [stderr] Compiling syn v2.0.25 [INFO] [stderr] Checking mio-extras v2.0.6 [INFO] [stderr] Checking notify v4.0.17 [INFO] [stderr] Checking regex-automata v0.3.3 [INFO] [stderr] Compiling argh_derive v0.1.10 [INFO] [stderr] Checking regex v1.9.1 [INFO] [stderr] Checking argh v0.1.10 [INFO] [stderr] Compiling serde_derive v1.0.171 [INFO] [stderr] Compiling tokio-macros v2.1.0 [INFO] [stderr] Checking indicatif v0.16.2 [INFO] [stderr] Checking predicates v1.0.8 [INFO] [stderr] Checking toml v0.5.11 [INFO] [stderr] Checking rustlings v5.5.1 (/opt/rustwide/workdir) [INFO] [stderr] Checking assert_cmd v0.11.1 [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.25s [INFO] running `Command { std: "docker" "inspect" "beb973ac87582971f41ca70d067511a509c1df16e49080d6cf8ab96cf688da04", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "beb973ac87582971f41ca70d067511a509c1df16e49080d6cf8ab96cf688da04", kill_on_drop: false }` [INFO] [stdout] beb973ac87582971f41ca70d067511a509c1df16e49080d6cf8ab96cf688da04 [INFO] checking cicvedu/rustlings-semester-2-z071230116 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-z071230116" "/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/cicvedu/rustlings-semester-2-z071230116 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-z071230116 [INFO] finished tweaking git repo https://github.com/cicvedu/rustlings-semester-2-z071230116 [INFO] tweaked toml for git repo https://github.com/cicvedu/rustlings-semester-2-z071230116 written to /workspace/builds/worker-4-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/cicvedu/rustlings-semester-2-z071230116 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] c2ff676b5a8a3514b6f2de3f269edb2b7766b5488e0c8fa28738c15b17d57fe2 [INFO] running `Command { std: "docker" "start" "-a" "c2ff676b5a8a3514b6f2de3f269edb2b7766b5488e0c8fa28738c15b17d57fe2", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "c2ff676b5a8a3514b6f2de3f269edb2b7766b5488e0c8fa28738c15b17d57fe2", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c2ff676b5a8a3514b6f2de3f269edb2b7766b5488e0c8fa28738c15b17d57fe2", kill_on_drop: false }` [INFO] [stdout] c2ff676b5a8a3514b6f2de3f269edb2b7766b5488e0c8fa28738c15b17d57fe2 [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] 391bcd5c26ac3b0af2f84e9f40b5af077767443a7de883901f790aefe3809b27 [INFO] running `Command { std: "docker" "start" "-a" "391bcd5c26ac3b0af2f84e9f40b5af077767443a7de883901f790aefe3809b27", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.64 [INFO] [stderr] Compiling unicode-ident v1.0.10 [INFO] [stderr] Compiling quote v1.0.29 [INFO] [stderr] Compiling serde v1.0.171 [INFO] [stderr] Compiling slab v0.4.8 [INFO] [stderr] Checking regex-syntax v0.7.4 [INFO] [stderr] Checking log v0.4.19 [INFO] [stderr] Compiling serde_json v1.0.102 [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Compiling libc v0.2.147 [INFO] [stderr] Checking smallvec v1.11.0 [INFO] [stderr] Checking itoa v1.0.8 [INFO] [stderr] Checking ryu v1.0.14 [INFO] [stderr] Checking aho-corasick v1.0.2 [INFO] [stderr] Compiling tokio v1.29.1 [INFO] [stderr] Checking lazycell v1.3.0 [INFO] [stderr] Checking predicates-core v1.0.6 [INFO] [stderr] Compiling argh_shared v0.1.10 [INFO] [stderr] Checking unicode-width v0.1.10 [INFO] [stderr] Compiling escargot v0.4.0 [INFO] [stderr] Checking walkdir v2.3.3 [INFO] [stderr] Checking float-cmp v0.8.0 [INFO] [stderr] Checking termtree v0.4.1 [INFO] [stderr] Checking pin-project-lite v0.2.10 [INFO] [stderr] Checking difference v2.0.0 [INFO] [stderr] Checking bytes v1.4.0 [INFO] [stderr] Checking normalize-line-endings v0.3.0 [INFO] [stderr] Checking glob v0.3.1 [INFO] [stderr] Checking home v0.5.5 [INFO] [stderr] Checking predicates-tree v1.0.9 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking net2 v0.2.39 [INFO] [stderr] Checking parking_lot_core v0.9.8 [INFO] [stderr] Checking inotify-sys v0.1.5 [INFO] [stderr] Checking socket2 v0.4.9 [INFO] [stderr] Checking console v0.15.7 [INFO] [stderr] Checking num_cpus v1.16.0 [INFO] [stderr] Checking signal-hook-registry v1.4.1 [INFO] [stderr] Checking mio v0.8.8 [INFO] [stderr] Checking filetime v0.2.21 [INFO] [stderr] Checking inotify v0.7.1 [INFO] [stderr] Checking mio v0.6.23 [INFO] [stderr] Checking parking_lot v0.12.1 [INFO] [stderr] Compiling syn v2.0.25 [INFO] [stderr] Checking mio-extras v2.0.6 [INFO] [stderr] Checking notify v4.0.17 [INFO] [stderr] Checking regex-automata v0.3.3 [INFO] [stderr] Compiling argh_derive v0.1.10 [INFO] [stderr] Checking regex v1.9.1 [INFO] [stderr] Compiling serde_derive v1.0.171 [INFO] [stderr] Compiling tokio-macros v2.1.0 [INFO] [stderr] Checking predicates v1.0.8 [INFO] [stderr] Checking indicatif v0.16.2 [INFO] [stderr] Checking argh v0.1.10 [INFO] [stderr] Checking toml v0.5.11 [INFO] [stderr] Checking rustlings v5.5.1 (/opt/rustwide/workdir) [INFO] [stderr] Checking assert_cmd v0.11.1 [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.84s [INFO] running `Command { std: "docker" "inspect" "391bcd5c26ac3b0af2f84e9f40b5af077767443a7de883901f790aefe3809b27", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "391bcd5c26ac3b0af2f84e9f40b5af077767443a7de883901f790aefe3809b27", kill_on_drop: false }` [INFO] [stdout] 391bcd5c26ac3b0af2f84e9f40b5af077767443a7de883901f790aefe3809b27