[INFO] cloning repository https://github.com/sebasmagri/rust-concurrency-patterns [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sebasmagri/rust-concurrency-patterns" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsebasmagri%2Frust-concurrency-patterns", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsebasmagri%2Frust-concurrency-patterns'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] c916fe831faec73a7fb5d652e91fa9da528d85c4 [INFO] checking sebasmagri/rust-concurrency-patterns against beta for pr-78714 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsebasmagri%2Frust-concurrency-patterns" "/workspace/builds/worker-3/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/sebasmagri/rust-concurrency-patterns on toolchain beta [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/sebasmagri/rust-concurrency-patterns [INFO] finished tweaking git repo https://github.com/sebasmagri/rust-concurrency-patterns [INFO] tweaked toml for git repo https://github.com/sebasmagri/rust-concurrency-patterns written to /workspace/builds/worker-3/source/Cargo.toml [INFO] crate git repo https://github.com/sebasmagri/rust-concurrency-patterns already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 6b4ae218d4f7deb1968c33b03e2ff8eb4717a248f512aea71967c5ef6c18065d [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "6b4ae218d4f7deb1968c33b03e2ff8eb4717a248f512aea71967c5ef6c18065d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "6b4ae218d4f7deb1968c33b03e2ff8eb4717a248f512aea71967c5ef6c18065d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "6b4ae218d4f7deb1968c33b03e2ff8eb4717a248f512aea71967c5ef6c18065d", kill_on_drop: false }` [INFO] [stdout] 6b4ae218d4f7deb1968c33b03e2ff8eb4717a248f512aea71967c5ef6c18065d [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 904e74424ee6363343d0a10985ab716c761bb40c14cbdd72a0ea99c299fbe5dd [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "904e74424ee6363343d0a10985ab716c761bb40c14cbdd72a0ea99c299fbe5dd", kill_on_drop: false }` [INFO] [stderr] Checking concurrency-patterns v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused `std::result::Result` that must be used [INFO] [stdout] --> examples/04-fan-in.rs:32:5 [INFO] [stdout] | [INFO] [stdout] 32 | consumer(Arc::new(Mutex::new(rx))).join(); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.71s [INFO] running `Command { std: "docker" "inspect" "904e74424ee6363343d0a10985ab716c761bb40c14cbdd72a0ea99c299fbe5dd", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "904e74424ee6363343d0a10985ab716c761bb40c14cbdd72a0ea99c299fbe5dd", kill_on_drop: false }` [INFO] [stdout] 904e74424ee6363343d0a10985ab716c761bb40c14cbdd72a0ea99c299fbe5dd