[INFO] fetching crate okasaki 0.1.0...
[INFO] building okasaki-0.1.0 against try#4987e9d4227139400384ab59296ffee3b0fb1183 for pr-146237-2
[INFO] extracting crate okasaki 0.1.0 into /workspace/builds/worker-0-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-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate okasaki 0.1.0 on toolchain 4987e9d4227139400384ab59296ffee3b0fb1183
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "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" "+4987e9d4227139400384ab59296ffee3b0fb1183" "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" "+4987e9d4227139400384ab59296ffee3b0fb1183" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 97b6bfda09ef141d2c341c8cbf277c1d2abac8842195326deecc2483c332e31a
[INFO] running `Command { std: "docker" "start" "-a" "97b6bfda09ef141d2c341c8cbf277c1d2abac8842195326deecc2483c332e31a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "97b6bfda09ef141d2c341c8cbf277c1d2abac8842195326deecc2483c332e31a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97b6bfda09ef141d2c341c8cbf277c1d2abac8842195326deecc2483c332e31a", kill_on_drop: false }`
[INFO] [stdout] 97b6bfda09ef141d2c341c8cbf277c1d2abac8842195326deecc2483c332e31a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5eae1a5fe4bc9cfbba93a9319da51e13d7948d3dde8177bbc8b85bb67003e27d
[INFO] running `Command { std: "docker" "start" "-a" "5eae1a5fe4bc9cfbba93a9319da51e13d7948d3dde8177bbc8b85bb67003e27d", kill_on_drop: false }`
[INFO] [stderr]    Compiling okasaki v0.1.0 (/opt/rustwide/workdir)
[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)]` (part of `#[warn(unused)]`) 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 0.13s
[INFO] running `Command { std: "docker" "inspect" "5eae1a5fe4bc9cfbba93a9319da51e13d7948d3dde8177bbc8b85bb67003e27d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5eae1a5fe4bc9cfbba93a9319da51e13d7948d3dde8177bbc8b85bb67003e27d", kill_on_drop: false }`
[INFO] [stdout] 5eae1a5fe4bc9cfbba93a9319da51e13d7948d3dde8177bbc8b85bb67003e27d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bd192e4f08c381cf70f53f2fe6eb8c20acb3d51053eae0adc7bdbeb14757ba99
[INFO] running `Command { std: "docker" "start" "-a" "bd192e4f08c381cf70f53f2fe6eb8c20acb3d51053eae0adc7bdbeb14757ba99", kill_on_drop: false }`
[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)]` (part of `#[warn(unused)]`) 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]    Compiling 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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "bd192e4f08c381cf70f53f2fe6eb8c20acb3d51053eae0adc7bdbeb14757ba99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd192e4f08c381cf70f53f2fe6eb8c20acb3d51053eae0adc7bdbeb14757ba99", kill_on_drop: false }`
[INFO] [stdout] bd192e4f08c381cf70f53f2fe6eb8c20acb3d51053eae0adc7bdbeb14757ba99