[INFO] cloning repository https://github.com/tenac1337/rustlings [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tenac1337/rustlings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftenac1337%2Frustlings", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftenac1337%2Frustlings'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 4ef5cf7bd1ed4b866e3d6220cac726f3ce5ea652 [INFO] checking tenac1337/rustlings against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftenac1337%2Frustlings" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'... [INFO] [stderr] done. [INFO] [stderr] Updating files: 95% (1175/1225) Updating files: 96% (1176/1225) Updating files: 97% (1189/1225) Updating files: 98% (1201/1225) Updating files: 99% (1213/1225) Updating files: 100% (1225/1225) Updating files: 100% (1225/1225), done. [INFO] validating manifest of git repo https://github.com/tenac1337/rustlings 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/tenac1337/rustlings [INFO] finished tweaking git repo https://github.com/tenac1337/rustlings [INFO] tweaked toml for git repo https://github.com/tenac1337/rustlings written to /workspace/builds/worker-1-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/tenac1337/rustlings 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-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] e050fe9475144d7a90cc2e3d78c54fa50e67e369a2854d2a4055cbc56fe7b524 [INFO] running `Command { std: "docker" "start" "-a" "e050fe9475144d7a90cc2e3d78c54fa50e67e369a2854d2a4055cbc56fe7b524", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "e050fe9475144d7a90cc2e3d78c54fa50e67e369a2854d2a4055cbc56fe7b524", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e050fe9475144d7a90cc2e3d78c54fa50e67e369a2854d2a4055cbc56fe7b524", kill_on_drop: false }` [INFO] [stdout] e050fe9475144d7a90cc2e3d78c54fa50e67e369a2854d2a4055cbc56fe7b524 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] b21a70aa77aa0a4821724f0ad10094884db65dab90822520572d7238156b9f0b [INFO] running `Command { std: "docker" "start" "-a" "b21a70aa77aa0a4821724f0ad10094884db65dab90822520572d7238156b9f0b", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.100 [INFO] [stderr] Compiling proc-macro2 v1.0.28 [INFO] [stderr] Compiling unicode-xid v0.2.2 [INFO] [stderr] Compiling syn v1.0.75 [INFO] [stderr] Compiling memchr v2.4.1 [INFO] [stderr] Compiling log v0.4.14 [INFO] [stderr] Compiling serde_derive v1.0.129 [INFO] [stderr] Compiling serde v1.0.129 [INFO] [stderr] Compiling autocfg v1.0.1 [INFO] [stderr] Compiling ryu v1.0.5 [INFO] [stderr] Checking regex-syntax v0.6.25 [INFO] [stderr] Compiling num-traits v0.2.14 [INFO] [stderr] Compiling serde_json v1.0.81 [INFO] [stderr] Compiling unicode-segmentation v1.8.0 [INFO] [stderr] Checking itoa v1.0.2 [INFO] [stderr] Checking slab v0.4.4 [INFO] [stderr] Checking predicates-core v1.0.2 [INFO] [stderr] Compiling argh_shared v0.1.5 [INFO] [stderr] Compiling quote v1.0.9 [INFO] [stderr] Compiling heck v0.3.3 [INFO] [stderr] Checking aho-corasick v0.7.18 [INFO] [stderr] Checking once_cell v1.10.0 [INFO] [stderr] Checking net2 v0.2.37 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking terminal_size v0.1.17 [INFO] [stderr] Checking inotify-sys v0.1.5 [INFO] [stderr] Compiling escargot v0.4.0 [INFO] [stderr] Checking unicode-width v0.1.8 [INFO] [stderr] Checking mio v0.6.23 [INFO] [stderr] Checking inotify v0.7.1 [INFO] [stderr] Checking filetime v0.2.15 [INFO] [stderr] Checking treeline v0.1.0 [INFO] [stderr] Checking normalize-line-endings v0.3.0 [INFO] [stderr] Checking difference v2.0.0 [INFO] [stderr] Checking predicates-tree v1.0.3 [INFO] [stderr] Checking glob v0.3.0 [INFO] [stderr] Checking home v0.5.3 [INFO] [stderr] Checking float-cmp v0.8.0 [INFO] [stderr] Checking mio-extras v2.0.6 [INFO] [stderr] Checking notify v4.0.17 [INFO] [stderr] Checking regex v1.5.5 [INFO] [stderr] Checking console v0.15.0 [INFO] [stderr] Checking predicates v1.0.8 [INFO] [stderr] Checking indicatif v0.16.2 [INFO] [stderr] Compiling argh_derive v0.1.5 [INFO] [stderr] Checking argh v0.1.5 [INFO] [stderr] Checking toml v0.5.9 [INFO] [stderr] Checking rustlings v5.0.0 (/opt/rustwide/workdir) [INFO] [stderr] Checking assert_cmd v0.11.1 [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 25.94s [INFO] running `Command { std: "docker" "inspect" "b21a70aa77aa0a4821724f0ad10094884db65dab90822520572d7238156b9f0b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "b21a70aa77aa0a4821724f0ad10094884db65dab90822520572d7238156b9f0b", kill_on_drop: false }` [INFO] [stdout] b21a70aa77aa0a4821724f0ad10094884db65dab90822520572d7238156b9f0b [INFO] checking tenac1337/rustlings against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftenac1337%2Frustlings" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'... [INFO] [stderr] done. [INFO] [stderr] Updating files: 66% (810/1225) Updating files: 67% (821/1225) Updating files: 68% (833/1225) Updating files: 69% (846/1225) Updating files: 70% (858/1225) Updating files: 71% (870/1225) Updating files: 72% (882/1225) Updating files: 73% (895/1225) Updating files: 74% (907/1225) Updating files: 75% (919/1225) Updating files: 76% (931/1225) Updating files: 77% (944/1225) Updating files: 78% (956/1225) Updating files: 79% (968/1225) Updating files: 80% (980/1225) Updating files: 81% (993/1225) Updating files: 82% (1005/1225) Updating files: 83% (1017/1225) Updating files: 84% (1029/1225) Updating files: 85% (1042/1225) Updating files: 86% (1054/1225) Updating files: 87% (1066/1225) Updating files: 88% (1078/1225) Updating files: 89% (1091/1225) Updating files: 90% (1103/1225) Updating files: 91% (1115/1225) Updating files: 92% (1127/1225) Updating files: 93% (1140/1225) Updating files: 94% (1152/1225) Updating files: 95% (1164/1225) Updating files: 96% (1176/1225) Updating files: 97% (1189/1225) Updating files: 98% (1201/1225) Updating files: 99% (1213/1225) Updating files: 100% (1225/1225) Updating files: 100% (1225/1225), done. [INFO] validating manifest of git repo https://github.com/tenac1337/rustlings 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/tenac1337/rustlings [INFO] finished tweaking git repo https://github.com/tenac1337/rustlings [INFO] tweaked toml for git repo https://github.com/tenac1337/rustlings written to /workspace/builds/worker-1-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/tenac1337/rustlings 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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 2089859b7a035e77d0955ff975e1e18e5b4a1763d53d603810cd877e26160d01 [INFO] running `Command { std: "docker" "start" "-a" "2089859b7a035e77d0955ff975e1e18e5b4a1763d53d603810cd877e26160d01", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "2089859b7a035e77d0955ff975e1e18e5b4a1763d53d603810cd877e26160d01", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "2089859b7a035e77d0955ff975e1e18e5b4a1763d53d603810cd877e26160d01", kill_on_drop: false }` [INFO] [stdout] 2089859b7a035e77d0955ff975e1e18e5b4a1763d53d603810cd877e26160d01 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 957e8b44ef5152db3785f9fa5c5abcac40c66016367ba3c41d480ab9ad2bcab1 [INFO] running `Command { std: "docker" "start" "-a" "957e8b44ef5152db3785f9fa5c5abcac40c66016367ba3c41d480ab9ad2bcab1", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.100 [INFO] [stderr] Compiling proc-macro2 v1.0.28 [INFO] [stderr] Compiling unicode-xid v0.2.2 [INFO] [stderr] Compiling syn v1.0.75 [INFO] [stderr] Compiling memchr v2.4.1 [INFO] [stderr] Compiling log v0.4.14 [INFO] [stderr] Compiling serde_derive v1.0.129 [INFO] [stderr] Compiling serde v1.0.129 [INFO] [stderr] Checking regex-syntax v0.6.25 [INFO] [stderr] Compiling ryu v1.0.5 [INFO] [stderr] Compiling autocfg v1.0.1 [INFO] [stderr] Compiling serde_json v1.0.81 [INFO] [stderr] Checking slab v0.4.4 [INFO] [stderr] Compiling unicode-segmentation v1.8.0 [INFO] [stderr] Compiling num-traits v0.2.14 [INFO] [stderr] Checking aho-corasick v0.7.18 [INFO] [stderr] Checking itoa v1.0.2 [INFO] [stderr] Checking predicates-core v1.0.2 [INFO] [stderr] Compiling argh_shared v0.1.5 [INFO] [stderr] Compiling quote v1.0.9 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking net2 v0.2.37 [INFO] [stderr] Checking inotify-sys v0.1.5 [INFO] [stderr] Checking terminal_size v0.1.17 [INFO] [stderr] Compiling heck v0.3.3 [INFO] [stderr] Checking unicode-width v0.1.8 [INFO] [stderr] Compiling escargot v0.4.0 [INFO] [stderr] Checking once_cell v1.10.0 [INFO] [stderr] Checking mio v0.6.23 [INFO] [stderr] Checking inotify v0.7.1 [INFO] [stderr] Checking filetime v0.2.15 [INFO] [stderr] Checking treeline v0.1.0 [INFO] [stderr] Checking difference v2.0.0 [INFO] [stderr] Checking normalize-line-endings v0.3.0 [INFO] [stderr] Checking predicates-tree v1.0.3 [INFO] [stderr] Checking home v0.5.3 [INFO] [stderr] Checking glob v0.3.0 [INFO] [stderr] Checking float-cmp v0.8.0 [INFO] [stderr] Checking mio-extras v2.0.6 [INFO] [stderr] Checking regex v1.5.5 [INFO] [stderr] Checking notify v4.0.17 [INFO] [stderr] Checking console v0.15.0 [INFO] [stderr] Checking predicates v1.0.8 [INFO] [stderr] Checking indicatif v0.16.2 [INFO] [stderr] Compiling argh_derive v0.1.5 [INFO] [stderr] Checking argh v0.1.5 [INFO] [stderr] Checking toml v0.5.9 [INFO] [stderr] Checking rustlings v5.0.0 (/opt/rustwide/workdir) [INFO] [stderr] Checking assert_cmd v0.11.1 [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 23.71s [INFO] running `Command { std: "docker" "inspect" "957e8b44ef5152db3785f9fa5c5abcac40c66016367ba3c41d480ab9ad2bcab1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "957e8b44ef5152db3785f9fa5c5abcac40c66016367ba3c41d480ab9ad2bcab1", kill_on_drop: false }` [INFO] [stdout] 957e8b44ef5152db3785f9fa5c5abcac40c66016367ba3c41d480ab9ad2bcab1