[INFO] cloning repository https://github.com/Jiraffe7/maelstrom-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Jiraffe7/maelstrom-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJiraffe7%2Fmaelstrom-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJiraffe7%2Fmaelstrom-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 82ae8b755b0a385aa2001d7671788b4af4c48cbd
[INFO] checking Jiraffe7/maelstrom-rs/82ae8b755b0a385aa2001d7671788b4af4c48cbd against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJiraffe7%2Fmaelstrom-rs" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Jiraffe7/maelstrom-rs on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Jiraffe7/maelstrom-rs
[INFO] finished tweaking git repo https://github.com/Jiraffe7/maelstrom-rs
[INFO] tweaked toml for git repo https://github.com/Jiraffe7/maelstrom-rs written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Jiraffe7/maelstrom-rs 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" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cfb7cabd3dc364e87a32ace82d400aa94db64a9662b73b9975895fdc9ac21775
[INFO] running `Command { std: "docker" "start" "-a" "cfb7cabd3dc364e87a32ace82d400aa94db64a9662b73b9975895fdc9ac21775", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cfb7cabd3dc364e87a32ace82d400aa94db64a9662b73b9975895fdc9ac21775", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cfb7cabd3dc364e87a32ace82d400aa94db64a9662b73b9975895fdc9ac21775", kill_on_drop: false }`
[INFO] [stdout] cfb7cabd3dc364e87a32ace82d400aa94db64a9662b73b9975895fdc9ac21775
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dtail_expr_drop_order" "-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 21af3e567df8fdf23dbcc647ec3e41dd542b9543ecff93c1571fadd09faee1d3
[INFO] running `Command { std: "docker" "start" "-a" "21af3e567df8fdf23dbcc647ec3e41dd542b9543ecff93c1571fadd09faee1d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.146
[INFO] [stderr]    Compiling anyhow v1.0.71
[INFO] [stderr]    Compiling syn v2.0.18
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking ulid v1.0.0
[INFO] [stderr]    Compiling serde_derive v1.0.164
[INFO] [stderr]     Checking serde v1.0.164
[INFO] [stderr]     Checking serde_json v1.0.96
[INFO] [stderr]     Checking maelstrom-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> src/bin/broadcast.rs:5:22
[INFO] [stdout]   |
[INFO] [stdout] 5 |     io::{StdoutLock, Write},
[INFO] [stdout]   |                      ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> src/bin/broadcast.rs:5:22
[INFO] [stdout]   |
[INFO] [stdout] 5 |     io::{StdoutLock, Write},
[INFO] [stdout]   |                      ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `msg_communicated` is never read
[INFO] [stdout]   --> src/bin/broadcast.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | struct UniqueNode {
[INFO] [stdout]    |        ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 44 |     msg_communicated: HashMap<usize, HashSet<usize>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `msg_communicated` is never read
[INFO] [stdout]   --> src/bin/broadcast.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | struct UniqueNode {
[INFO] [stdout]    |        ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 44 |     msg_communicated: HashMap<usize, HashSet<usize>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` 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` profile [unoptimized + debuginfo] target(s) in 9.42s
[INFO] running `Command { std: "docker" "inspect" "21af3e567df8fdf23dbcc647ec3e41dd542b9543ecff93c1571fadd09faee1d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21af3e567df8fdf23dbcc647ec3e41dd542b9543ecff93c1571fadd09faee1d3", kill_on_drop: false }`
[INFO] [stdout] 21af3e567df8fdf23dbcc647ec3e41dd542b9543ecff93c1571fadd09faee1d3