[INFO] cloning repository https://github.com/suelz/chapter_4 [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/suelz/chapter_4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsuelz%2Fchapter_4", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsuelz%2Fchapter_4'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 5266a4ada4918881254cc79de937fbc229bb69a4 [INFO] checking suelz/chapter_4 against try#894d32a5432c6a6461bb2aac7c3d5f2e87dce83f for pr-77015 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsuelz%2Fchapter_4" "/workspace/builds/worker-7/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/suelz/chapter_4 on toolchain 894d32a5432c6a6461bb2aac7c3d5f2e87dce83f [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/suelz/chapter_4 [INFO] finished tweaking git repo https://github.com/suelz/chapter_4 [INFO] tweaked toml for git repo https://github.com/suelz/chapter_4 written to /workspace/builds/worker-7/source/Cargo.toml [INFO] crate git repo https://github.com/suelz/chapter_4 already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 23e6484a79b99670a91231326323c2a3882fb2f1c4c84f4e0dc4accc65d218b9 [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" "23e6484a79b99670a91231326323c2a3882fb2f1c4c84f4e0dc4accc65d218b9", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "23e6484a79b99670a91231326323c2a3882fb2f1c4c84f4e0dc4accc65d218b9", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "23e6484a79b99670a91231326323c2a3882fb2f1c4c84f4e0dc4accc65d218b9", kill_on_drop: false }` [INFO] [stdout] 23e6484a79b99670a91231326323c2a3882fb2f1c4c84f4e0dc4accc65d218b9 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 29d99e7fe52b875d27c8655db97e938c4512d4dcf350fc31e3d32ec3333039b4 [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" "29d99e7fe52b875d27c8655db97e938c4512d4dcf350fc31e3d32ec3333039b4", kill_on_drop: false }` [INFO] [stderr] Checking ch4 v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/main.rs:28:9 [INFO] [stdout] | [INFO] [stdout] 28 | let word = first_word(&x); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:26:9 [INFO] [stdout] | [INFO] [stdout] 26 | let mut x = String::from("Conor Kennedy"); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/main.rs:28:9 [INFO] [stdout] | [INFO] [stdout] 28 | let word = first_word(&x); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:26:9 [INFO] [stdout] | [INFO] [stdout] 26 | let mut x = String::from("Conor Kennedy"); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.60s [INFO] running `Command { std: "docker" "inspect" "29d99e7fe52b875d27c8655db97e938c4512d4dcf350fc31e3d32ec3333039b4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "29d99e7fe52b875d27c8655db97e938c4512d4dcf350fc31e3d32ec3333039b4", kill_on_drop: false }` [INFO] [stdout] 29d99e7fe52b875d27c8655db97e938c4512d4dcf350fc31e3d32ec3333039b4