[INFO] cloning repository https://github.com/masuke5/opt-for-lang2
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/masuke5/opt-for-lang2" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmasuke5%2Fopt-for-lang2", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmasuke5%2Fopt-for-lang2'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e952a7ac35b5ef580526d0971273cd283ee207e0
[INFO] checking masuke5/opt-for-lang2 against master#8c6ce6b91b172f77c795a74bfeaf74b865146b3f for pr-101345
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmasuke5%2Fopt-for-lang2" "/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/masuke5/opt-for-lang2 on toolchain 8c6ce6b91b172f77c795a74bfeaf74b865146b3f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8c6ce6b91b172f77c795a74bfeaf74b865146b3f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/masuke5/opt-for-lang2
[INFO] finished tweaking git repo https://github.com/masuke5/opt-for-lang2
[INFO] tweaked toml for git repo https://github.com/masuke5/opt-for-lang2 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/masuke5/opt-for-lang2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8c6ce6b91b172f77c795a74bfeaf74b865146b3f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+8c6ce6b91b172f77c795a74bfeaf74b865146b3f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 39b351b77f5eed4c86a6941fb18f33492f578061587ce5b313b1e9a229732ac1
[INFO] running `Command { std: "docker" "start" "-a" "39b351b77f5eed4c86a6941fb18f33492f578061587ce5b313b1e9a229732ac1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "39b351b77f5eed4c86a6941fb18f33492f578061587ce5b313b1e9a229732ac1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39b351b77f5eed4c86a6941fb18f33492f578061587ce5b313b1e9a229732ac1", kill_on_drop: false }`
[INFO] [stdout] 39b351b77f5eed4c86a6941fb18f33492f578061587ce5b313b1e9a229732ac1
[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" "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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+8c6ce6b91b172f77c795a74bfeaf74b865146b3f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5bdcefdb9560c7d130075644456293e98f6be0343179156a9f63c4532f166919
[INFO] running `Command { std: "docker" "start" "-a" "5bdcefdb9560c7d130075644456293e98f6be0343179156a9f63c4532f166919", kill_on_drop: false }`
[INFO] [stderr]     Checking maplit v1.0.2
[INFO] [stderr]     Checking opt-for-lang2 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `value`, `pred` and `succ` are never read
[INFO] [stdout]    --> src/graph.rs:117:13
[INFO] [stdout]     |
[INFO] [stdout] 116 |         struct Node<'a, T> {
[INFO] [stdout]     |                ---- fields in this struct
[INFO] [stdout] 117 |             value: &'a T,
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 118 |             pred: Vec<usize>,
[INFO] [stdout]     |             ^^^^
[INFO] [stdout] 119 |             succ: Vec<usize>,
[INFO] [stdout]     |             ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value`, `pred` and `succ` are never read
[INFO] [stdout]    --> src/graph.rs:117:13
[INFO] [stdout]     |
[INFO] [stdout] 116 |         struct Node<'a, T> {
[INFO] [stdout]     |                ---- fields in this struct
[INFO] [stdout] 117 |             value: &'a T,
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 118 |             pred: Vec<usize>,
[INFO] [stdout]     |             ^^^^
[INFO] [stdout] 119 |             succ: Vec<usize>,
[INFO] [stdout]     |             ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "5bdcefdb9560c7d130075644456293e98f6be0343179156a9f63c4532f166919", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bdcefdb9560c7d130075644456293e98f6be0343179156a9f63c4532f166919", kill_on_drop: false }`
[INFO] [stdout] 5bdcefdb9560c7d130075644456293e98f6be0343179156a9f63c4532f166919