[INFO] fetching crate okasaki 0.1.0...
[INFO] checking okasaki-0.1.0 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate okasaki 0.1.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate okasaki 0.1.0
[INFO] finished tweaking crates.io crate okasaki 0.1.0
[INFO] tweaked toml for crates.io crate okasaki 0.1.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate okasaki 0.1.0 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e199a0696ef0f4ca32a9b6bc924047273b7d2c5d9fd88dc6edcf07d7b608f929
[INFO] running `Command { std: "docker" "start" "-a" "e199a0696ef0f4ca32a9b6bc924047273b7d2c5d9fd88dc6edcf07d7b608f929", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e199a0696ef0f4ca32a9b6bc924047273b7d2c5d9fd88dc6edcf07d7b608f929", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e199a0696ef0f4ca32a9b6bc924047273b7d2c5d9fd88dc6edcf07d7b608f929", kill_on_drop: false }`
[INFO] [stdout] e199a0696ef0f4ca32a9b6bc924047273b7d2c5d9fd88dc6edcf07d7b608f929
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef1437fa0ac1a0c5bcd14a21e0593ce4d33d0e508d9539a6815d1f6af74f07f8
[INFO] running `Command { std: "docker" "start" "-a" "ef1437fa0ac1a0c5bcd14a21e0593ce4d33d0e508d9539a6815d1f6af74f07f8", kill_on_drop: false }`
[INFO] [stderr]     Checking okasaki v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> src/list.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct ListNode<T> {
[INFO] [stdout]   |        -------- field in this struct
[INFO] [stdout] 2 |     value: T,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListNode` is never constructed
[INFO] [stdout]  --> src/list.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct ListNode<T> {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `len` is never used
[INFO] [stdout]  --> src/list.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<T> ListNode<T> {
[INFO] [stdout]   | ------------------- method in this implementation
[INFO] [stdout] 7 |     fn len(&self) -> usize {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `List` is never constructed
[INFO] [stdout]   --> src/list.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct List<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `len` are never used
[INFO] [stdout]   --> src/list.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<T> List<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 23 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub fn len(&self) -> usize {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "ef1437fa0ac1a0c5bcd14a21e0593ce4d33d0e508d9539a6815d1f6af74f07f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef1437fa0ac1a0c5bcd14a21e0593ce4d33d0e508d9539a6815d1f6af74f07f8", kill_on_drop: false }`
[INFO] [stdout] ef1437fa0ac1a0c5bcd14a21e0593ce4d33d0e508d9539a6815d1f6af74f07f8