[INFO] cloning repository https://github.com/rfrm/first-assignment
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rfrm/first-assignment" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frfrm%2Ffirst-assignment", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frfrm%2Ffirst-assignment'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a36bbd94584785c3f2acf0ba63e6f3c15f52ae7d
[INFO] checking rfrm/first-assignment against master#092a284ba0421695f2032c947765429fd7095796 for pr-139763
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frfrm%2Ffirst-assignment" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rfrm/first-assignment on toolchain 092a284ba0421695f2032c947765429fd7095796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+092a284ba0421695f2032c947765429fd7095796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rfrm/first-assignment
[INFO] finished tweaking git repo https://github.com/rfrm/first-assignment
[INFO] tweaked toml for git repo https://github.com/rfrm/first-assignment written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/rfrm/first-assignment 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" "+092a284ba0421695f2032c947765429fd7095796" "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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+092a284ba0421695f2032c947765429fd7095796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3450f2afc7a201a70758a9e649839e4766a53184644d3ce70a8e3b6acf1fabdd
[INFO] running `Command { std: "docker" "start" "-a" "3450f2afc7a201a70758a9e649839e4766a53184644d3ce70a8e3b6acf1fabdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3450f2afc7a201a70758a9e649839e4766a53184644d3ce70a8e3b6acf1fabdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3450f2afc7a201a70758a9e649839e4766a53184644d3ce70a8e3b6acf1fabdd", kill_on_drop: false }`
[INFO] [stdout] 3450f2afc7a201a70758a9e649839e4766a53184644d3ce70a8e3b6acf1fabdd
[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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+092a284ba0421695f2032c947765429fd7095796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a18c27b0366c05c27ab4071cd9774f4044e1493daf64cb8ae378855ebc740a84
[INFO] running `Command { std: "docker" "start" "-a" "a18c27b0366c05c27ab4071cd9774f4044e1493daf64cb8ae378855ebc740a84", kill_on_drop: false }`
[INFO] [stderr]     Checking first-assignment v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `author` is never read
[INFO] [stdout]   --> src/library.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Book<'a> {
[INFO] [stdout]    |            ---- field in this struct
[INFO] [stdout] 11 |     pub title: &'a str,
[INFO] [stdout] 12 |     pub author: &'a str,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `author` is never read
[INFO] [stdout]   --> src/library.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Book<'a> {
[INFO] [stdout]    |            ---- field in this struct
[INFO] [stdout] 11 |     pub title: &'a str,
[INFO] [stdout] 12 |     pub author: &'a str,
[INFO] [stdout]    |         ^^^^^^
[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 0.26s
[INFO] running `Command { std: "docker" "inspect" "a18c27b0366c05c27ab4071cd9774f4044e1493daf64cb8ae378855ebc740a84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a18c27b0366c05c27ab4071cd9774f4044e1493daf64cb8ae378855ebc740a84", kill_on_drop: false }`
[INFO] [stdout] a18c27b0366c05c27ab4071cd9774f4044e1493daf64cb8ae378855ebc740a84