[INFO] cloning repository https://github.com/TaPO4eg3D/too-many-linked-lists
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TaPO4eg3D/too-many-linked-lists" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTaPO4eg3D%2Ftoo-many-linked-lists", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTaPO4eg3D%2Ftoo-many-linked-lists'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ff4a9c06f3514f64f53a8f5737c4b7bf4f9096a9
[INFO] checking TaPO4eg3D/too-many-linked-lists against try#fc545c6b951a304df08b327c158f92678582f435 for pr-140557
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTaPO4eg3D%2Ftoo-many-linked-lists" "/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/TaPO4eg3D/too-many-linked-lists on toolchain fc545c6b951a304df08b327c158f92678582f435
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fc545c6b951a304df08b327c158f92678582f435" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/TaPO4eg3D/too-many-linked-lists
[INFO] finished tweaking git repo https://github.com/TaPO4eg3D/too-many-linked-lists
[INFO] tweaked toml for git repo https://github.com/TaPO4eg3D/too-many-linked-lists written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/TaPO4eg3D/too-many-linked-lists 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" "+fc545c6b951a304df08b327c158f92678582f435" "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-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+fc545c6b951a304df08b327c158f92678582f435" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0811cde96b9983e48539f54c71dae195142e7a7c7a3034d66e24408850cdb9d4
[INFO] running `Command { std: "docker" "start" "-a" "0811cde96b9983e48539f54c71dae195142e7a7c7a3034d66e24408850cdb9d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0811cde96b9983e48539f54c71dae195142e7a7c7a3034d66e24408850cdb9d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0811cde96b9983e48539f54c71dae195142e7a7c7a3034d66e24408850cdb9d4", kill_on_drop: false }`
[INFO] [stdout] 0811cde96b9983e48539f54c71dae195142e7a7c7a3034d66e24408850cdb9d4
[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" "-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" "+fc545c6b951a304df08b327c158f92678582f435" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2f84ca11c6c49368682c1375ce70aaf6e973d10788a0b6129343a05d9343c1ba
[INFO] running `Command { std: "docker" "start" "-a" "2f84ca11c6c49368682c1375ce70aaf6e973d10788a0b6129343a05d9343c1ba", kill_on_drop: false }`
[INFO] [stderr]     Checking too-many-linked-lists v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant `More` is never constructed
[INFO] [stdout]  --> src/first.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | enum Link {
[INFO] [stdout]   |      ---- variant in this enum
[INFO] [stdout] 8 |     Empty,
[INFO] [stdout] 9 |     More(Box<Node>),
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `elem` is never read
[INFO] [stdout]   --> src/first.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct Node {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 13 |     elem: i32,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push`, and `pop` are never used
[INFO] [stdout]   --> src/first.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl List {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 18 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn push(&mut self, elem: i32) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     fn pop(&mut self) -> Option<i32> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "2f84ca11c6c49368682c1375ce70aaf6e973d10788a0b6129343a05d9343c1ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f84ca11c6c49368682c1375ce70aaf6e973d10788a0b6129343a05d9343c1ba", kill_on_drop: false }`
[INFO] [stdout] 2f84ca11c6c49368682c1375ce70aaf6e973d10788a0b6129343a05d9343c1ba