[INFO] cloning repository https://github.com/thomabel/connect-4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/thomabel/connect-4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthomabel%2Fconnect-4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthomabel%2Fconnect-4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 10217d734989639c723adaae6ef6d46e8ed79359
[INFO] checking thomabel/connect-4 against df1ae0f7dd168513de2d89beb2cb7a95d4fdc118 for pr-159343-retry
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthomabel%2Fconnect-4" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/thomabel/connect-4
[INFO] finished tweaking git repo https://github.com/thomabel/connect-4
[INFO] tweaked toml for git repo https://github.com/thomabel/connect-4 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/thomabel/connect-4 on toolchain df1ae0f7dd168513de2d89beb2cb7a95d4fdc118
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+df1ae0f7dd168513de2d89beb2cb7a95d4fdc118" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/thomabel/connect-4 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" "+df1ae0f7dd168513de2d89beb2cb7a95d4fdc118" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded slab_tree v0.3.2
[INFO] [stderr]   Downloaded snowflake v1.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3d5ced03c013a94a2f102a4510f48a6e9184255caf5fd8244f58017bde7f5210" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] d9e573c7ea5f51b0919f2ac0016089d3a893afb99c50d01d71a2fa823d8acb13
[INFO] running `Command { std: "docker" "start" "d9e573c7ea5f51b0919f2ac0016089d3a893afb99c50d01d71a2fa823d8acb13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d9e573c7ea5f51b0919f2ac0016089d3a893afb99c50d01d71a2fa823d8acb13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "d9e573c7ea5f51b0919f2ac0016089d3a893afb99c50d01d71a2fa823d8acb13" "/opt/rustwide/cargo-home/bin/cargo" "+df1ae0f7dd168513de2d89beb2cb7a95d4fdc118" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d9e573c7ea5f51b0919f2ac0016089d3a893afb99c50d01d71a2fa823d8acb13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "d9e573c7ea5f51b0919f2ac0016089d3a893afb99c50d01d71a2fa823d8acb13" "/opt/rustwide/cargo-home/bin/cargo" "+df1ae0f7dd168513de2d89beb2cb7a95d4fdc118" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking snowflake v1.3.0
[INFO] [stderr]     Checking slab_tree v0.3.2
[INFO] [stderr]     Checking connect-4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `NodeId`, `NodeMut`, `NodeRef`, `TreeBuilder`, and `Tree`
[INFO] [stdout]  --> src/minimax.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use slab_tree::{Tree, TreeBuilder, NodeId, NodeMut, NodeRef};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^^^^^  ^^^^^^  ^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `NodeId`, `NodeMut`, `NodeRef`, `TreeBuilder`, and `Tree`
[INFO] [stdout]  --> src/minimax.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use slab_tree::{Tree, TreeBuilder, NodeId, NodeMut, NodeRef};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^^^^^  ^^^^^^  ^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.72s
[INFO] running `Command { std: "docker" "inspect" "d9e573c7ea5f51b0919f2ac0016089d3a893afb99c50d01d71a2fa823d8acb13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9e573c7ea5f51b0919f2ac0016089d3a893afb99c50d01d71a2fa823d8acb13", kill_on_drop: false }`
[INFO] [stdout] d9e573c7ea5f51b0919f2ac0016089d3a893afb99c50d01d71a2fa823d8acb13