[INFO] cloning repository https://github.com/masatoshiitoh/rusttour-chapter4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/masatoshiitoh/rusttour-chapter4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmasatoshiitoh%2Frusttour-chapter4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmasatoshiitoh%2Frusttour-chapter4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5628f0e22f84feef39391fddd5f567e1ca5b303d
[INFO] checking masatoshiitoh/rusttour-chapter4 against try#901e6d56697c79b2e80df6a487b2318ec6f57ee3 for pr-142287
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmasatoshiitoh%2Frusttour-chapter4" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/masatoshiitoh/rusttour-chapter4 on toolchain 901e6d56697c79b2e80df6a487b2318ec6f57ee3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/masatoshiitoh/rusttour-chapter4
[INFO] finished tweaking git repo https://github.com/masatoshiitoh/rusttour-chapter4
[INFO] tweaked toml for git repo https://github.com/masatoshiitoh/rusttour-chapter4 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/masatoshiitoh/rusttour-chapter4 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" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 561cbfaf16bf79ec73c1bcdcb971b92fbfbadc29972666479f86931fed1d1330
[INFO] running `Command { std: "docker" "start" "-a" "561cbfaf16bf79ec73c1bcdcb971b92fbfbadc29972666479f86931fed1d1330", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "561cbfaf16bf79ec73c1bcdcb971b92fbfbadc29972666479f86931fed1d1330", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "561cbfaf16bf79ec73c1bcdcb971b92fbfbadc29972666479f86931fed1d1330", kill_on_drop: false }`
[INFO] [stdout] 561cbfaf16bf79ec73c1bcdcb971b92fbfbadc29972666479f86931fed1d1330
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f93308026e18496f3bf4dd303443b63d4516e13d404411e6c93fec6c58b7149b
[INFO] running `Command { std: "docker" "start" "-a" "f93308026e18496f3bf4dd303443b63d4516e13d404411e6c93fec6c58b7149b", kill_on_drop: false }`
[INFO] [stderr]     Checking rusttour-chapter4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `birth` is never read
[INFO] [stdout]  --> src/main.rs:1:38
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Person {name: Option<String>, birth: i32}
[INFO] [stdout]   |        ------ field in this struct   ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `birth` is never read
[INFO] [stdout]  --> src/main.rs:1:38
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Person {name: Option<String>, birth: i32}
[INFO] [stdout]   |        ------ field in this struct   ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] running `Command { std: "docker" "inspect" "f93308026e18496f3bf4dd303443b63d4516e13d404411e6c93fec6c58b7149b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f93308026e18496f3bf4dd303443b63d4516e13d404411e6c93fec6c58b7149b", kill_on_drop: false }`
[INFO] [stdout] f93308026e18496f3bf4dd303443b63d4516e13d404411e6c93fec6c58b7149b