[INFO] cloning repository https://github.com/LearningOS/rust-rustlings-2023-autumn-yuduyu6 [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LearningOS/rust-rustlings-2023-autumn-yuduyu6" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLearningOS%2Frust-rustlings-2023-autumn-yuduyu6", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLearningOS%2Frust-rustlings-2023-autumn-yuduyu6'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 9c83051b3b06dea6453414da130a78c737d58a26 [INFO] checking LearningOS/rust-rustlings-2023-autumn-yuduyu6 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLearningOS%2Frust-rustlings-2023-autumn-yuduyu6" "/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/LearningOS/rust-rustlings-2023-autumn-yuduyu6 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/LearningOS/rust-rustlings-2023-autumn-yuduyu6 [INFO] finished tweaking git repo https://github.com/LearningOS/rust-rustlings-2023-autumn-yuduyu6 [INFO] tweaked toml for git repo https://github.com/LearningOS/rust-rustlings-2023-autumn-yuduyu6 written to /workspace/builds/worker-4-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/LearningOS/rust-rustlings-2023-autumn-yuduyu6 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] fce1f230163845a92562f404c62b6057204bdd744a58d5728756a9744b4c0dd5 [INFO] running `Command { std: "docker" "start" "-a" "fce1f230163845a92562f404c62b6057204bdd744a58d5728756a9744b4c0dd5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "fce1f230163845a92562f404c62b6057204bdd744a58d5728756a9744b4c0dd5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "fce1f230163845a92562f404c62b6057204bdd744a58d5728756a9744b4c0dd5", kill_on_drop: false }` [INFO] [stdout] fce1f230163845a92562f404c62b6057204bdd744a58d5728756a9744b4c0dd5 [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] 7f965a22376d23cf0edc59804fef79827cbf2dce4f228bae5afd052c03ebc278 [INFO] running `Command { std: "docker" "start" "-a" "7f965a22376d23cf0edc59804fef79827cbf2dce4f228bae5afd052c03ebc278", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.147 [INFO] [stderr] Compiling proc-macro2 v1.0.64 [INFO] [stderr] Compiling quote v1.0.29 [INFO] [stderr] Compiling unicode-ident v1.0.10 [INFO] [stderr] Compiling serde v1.0.171 [INFO] [stderr] Checking regex-syntax v0.7.4 [INFO] [stderr] Checking log v0.4.19 [INFO] [stderr] Compiling num-traits v0.2.15 [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Compiling serde_json v1.0.102 [INFO] [stderr] Checking itoa v1.0.8 [INFO] [stderr] Checking ryu v1.0.14 [INFO] [stderr] Compiling tokio v1.29.1 [INFO] [stderr] Compiling escargot v0.4.0 [INFO] [stderr] Checking unicode-width v0.1.10 [INFO] [stderr] Compiling argh_shared v0.1.10 [INFO] [stderr] Checking predicates-core v1.0.6 [INFO] [stderr] Checking lazycell v1.3.0 [INFO] [stderr] Checking walkdir v2.3.3 [INFO] [stderr] Checking number_prefix v0.4.0 [INFO] [stderr] Checking difference v2.0.0 [INFO] [stderr] Checking termtree v0.4.1 [INFO] [stderr] Checking pin-project-lite v0.2.10 [INFO] [stderr] Checking normalize-line-endings v0.3.0 [INFO] [stderr] Checking home v0.5.5 [INFO] [stderr] Checking predicates-tree v1.0.9 [INFO] [stderr] Checking glob v0.3.1 [INFO] [stderr] Checking net2 v0.2.39 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking parking_lot_core v0.9.8 [INFO] [stderr] Checking inotify-sys v0.1.5 [INFO] [stderr] Checking num_cpus v1.16.0 [INFO] [stderr] Checking filetime v0.2.21 [INFO] [stderr] Checking inotify v0.7.1 [INFO] [stderr] Compiling syn v2.0.25 [INFO] [stderr] Checking mio v0.6.23 [INFO] [stderr] Checking parking_lot v0.12.1 [INFO] [stderr] Checking float-cmp v0.8.0 [INFO] [stderr] Checking signal-hook-registry v1.4.1 [INFO] [stderr] Checking socket2 v0.4.9 [INFO] [stderr] Checking mio v0.8.8 [INFO] [stderr] Checking console v0.15.7 [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] Checking regex v1.9.1 [INFO] [stderr] Checking predicates v1.0.8 [INFO] [stderr] Checking indicatif v0.16.2 [INFO] [stderr] Compiling argh_derive v0.1.10 [INFO] [stderr] Compiling serde_derive v1.0.171 [INFO] [stderr] Compiling tokio-macros v2.1.0 [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 24.98s [INFO] running `Command { std: "docker" "inspect" "7f965a22376d23cf0edc59804fef79827cbf2dce4f228bae5afd052c03ebc278", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "7f965a22376d23cf0edc59804fef79827cbf2dce4f228bae5afd052c03ebc278", kill_on_drop: false }` [INFO] [stdout] 7f965a22376d23cf0edc59804fef79827cbf2dce4f228bae5afd052c03ebc278 [INFO] checking LearningOS/rust-rustlings-2023-autumn-yuduyu6 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLearningOS%2Frust-rustlings-2023-autumn-yuduyu6" "/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/LearningOS/rust-rustlings-2023-autumn-yuduyu6 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/LearningOS/rust-rustlings-2023-autumn-yuduyu6 [INFO] finished tweaking git repo https://github.com/LearningOS/rust-rustlings-2023-autumn-yuduyu6 [INFO] tweaked toml for git repo https://github.com/LearningOS/rust-rustlings-2023-autumn-yuduyu6 written to /workspace/builds/worker-4-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/LearningOS/rust-rustlings-2023-autumn-yuduyu6 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] [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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] a7190e1c70f07bc05bdebfd786770f21c976fba8ac0332674fb6ab32efedfe94 [INFO] running `Command { std: "docker" "start" "-a" "a7190e1c70f07bc05bdebfd786770f21c976fba8ac0332674fb6ab32efedfe94", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "a7190e1c70f07bc05bdebfd786770f21c976fba8ac0332674fb6ab32efedfe94", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a7190e1c70f07bc05bdebfd786770f21c976fba8ac0332674fb6ab32efedfe94", kill_on_drop: false }` [INFO] [stdout] a7190e1c70f07bc05bdebfd786770f21c976fba8ac0332674fb6ab32efedfe94 [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] 01148247a8259213831ce2cf741d7ff7c9ad0f304e02dba2b12126b997377aa1 [INFO] running `Command { std: "docker" "start" "-a" "01148247a8259213831ce2cf741d7ff7c9ad0f304e02dba2b12126b997377aa1", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.147 [INFO] [stderr] Compiling proc-macro2 v1.0.64 [INFO] [stderr] Compiling quote v1.0.29 [INFO] [stderr] Compiling unicode-ident v1.0.10 [INFO] [stderr] Compiling serde v1.0.171 [INFO] [stderr] Checking regex-syntax v0.7.4 [INFO] [stderr] Checking log v0.4.19 [INFO] [stderr] Compiling num-traits v0.2.15 [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 itoa v1.0.8 [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 number_prefix v0.4.0 [INFO] [stderr] Checking pin-project-lite v0.2.10 [INFO] [stderr] Checking difference v2.0.0 [INFO] [stderr] Checking normalize-line-endings v0.3.0 [INFO] [stderr] Checking termtree v0.4.1 [INFO] [stderr] Checking glob v0.3.1 [INFO] [stderr] Checking home v0.5.5 [INFO] [stderr] Checking predicates-tree v1.0.9 [INFO] [stderr] Compiling syn v2.0.25 [INFO] [stderr] Checking net2 v0.2.39 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking parking_lot_core v0.9.8 [INFO] [stderr] Checking inotify-sys v0.1.5 [INFO] [stderr] Checking inotify v0.7.1 [INFO] [stderr] Checking signal-hook-registry v1.4.1 [INFO] [stderr] Checking mio v0.6.23 [INFO] [stderr] Checking parking_lot v0.12.1 [INFO] [stderr] Checking filetime v0.2.21 [INFO] [stderr] Checking console v0.15.7 [INFO] [stderr] Checking num_cpus v1.16.0 [INFO] [stderr] Checking mio v0.8.8 [INFO] [stderr] Checking float-cmp v0.8.0 [INFO] [stderr] Checking socket2 v0.4.9 [INFO] [stderr] Checking mio-extras v2.0.6 [INFO] [stderr] Checking regex-automata v0.3.3 [INFO] [stderr] Checking notify v4.0.17 [INFO] [stderr] Compiling argh_derive v0.1.10 [INFO] [stderr] Checking regex v1.9.1 [INFO] [stderr] Checking predicates v1.0.8 [INFO] [stderr] Checking indicatif v0.16.2 [INFO] [stderr] Compiling serde_derive v1.0.171 [INFO] [stderr] Compiling tokio-macros v2.1.0 [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 29.61s [INFO] running `Command { std: "docker" "inspect" "01148247a8259213831ce2cf741d7ff7c9ad0f304e02dba2b12126b997377aa1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "01148247a8259213831ce2cf741d7ff7c9ad0f304e02dba2b12126b997377aa1", kill_on_drop: false }` [INFO] [stdout] 01148247a8259213831ce2cf741d7ff7c9ad0f304e02dba2b12126b997377aa1