[INFO] cloning repository https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kazchimo/purely-functional-data-stuructures.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazchimo%2Fpurely-functional-data-stuructures.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazchimo%2Fpurely-functional-data-stuructures.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7259f58fdcce9dc859d18d9a3f24d71bebea301a
[INFO] checking kazchimo/purely-functional-data-stuructures.rs against master#368e2fd458a22d0cc133d0c254f2612ee999744f for pr-128351
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazchimo%2Fpurely-functional-data-stuructures.rs" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs on toolchain 368e2fd458a22d0cc133d0c254f2612ee999744f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+368e2fd458a22d0cc133d0c254f2612ee999744f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] finished tweaking git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] tweaked toml for git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kazchimo/purely-functional-data-stuructures.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" "+368e2fd458a22d0cc133d0c254f2612ee999744f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking kazchimo/purely-functional-data-stuructures.rs against try#09146510cdb33d15474a35fde290187a88b1cf35 for pr-128351
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazchimo%2Fpurely-functional-data-stuructures.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/kazchimo/purely-functional-data-stuructures.rs on toolchain 09146510cdb33d15474a35fde290187a88b1cf35
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+09146510cdb33d15474a35fde290187a88b1cf35" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] finished tweaking git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] tweaked toml for git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kazchimo/purely-functional-data-stuructures.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" "+09146510cdb33d15474a35fde290187a88b1cf35" "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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+09146510cdb33d15474a35fde290187a88b1cf35" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 76343aa293be8ab5d739f30a3478fbbfef57b6671000d0249fce6913b21afceb
[INFO] running `Command { std: "docker" "start" "-a" "76343aa293be8ab5d739f30a3478fbbfef57b6671000d0249fce6913b21afceb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "76343aa293be8ab5d739f30a3478fbbfef57b6671000d0249fce6913b21afceb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76343aa293be8ab5d739f30a3478fbbfef57b6671000d0249fce6913b21afceb", kill_on_drop: false }`
[INFO] [stdout] 76343aa293be8ab5d739f30a3478fbbfef57b6671000d0249fce6913b21afceb
[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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+09146510cdb33d15474a35fde290187a88b1cf35" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4a3dff72a996e374e0d4f598cb3f30b4f603ecac8f840e693e30384502db4d32
[INFO] running `Command { std: "docker" "start" "-a" "4a3dff72a996e374e0d4f598cb3f30b4f603ecac8f840e693e30384502db4d32", kill_on_drop: false }`
[INFO] [stderr]     Checking purely-functional-data-structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]  --> src/list.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum List<'a, T> {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `empty`, `one`, `cons`, `is_empty`, `head`, and `tail` are never used
[INFO] [stdout]   --> src/list.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl<T> List<'_, T> {
[INFO] [stdout]    | ------------------- associated items in this implementation
[INFO] [stdout] 10 |     fn empty() -> List<'static, T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 14 |     fn one(a: &T) -> List<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 18 |     fn cons<'a>(x: &'a T, s: &'a List<T>) -> List<'a, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     fn head(&self) -> &T {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     fn tail(&self) -> &List<'_, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "4a3dff72a996e374e0d4f598cb3f30b4f603ecac8f840e693e30384502db4d32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a3dff72a996e374e0d4f598cb3f30b4f603ecac8f840e693e30384502db4d32", kill_on_drop: false }`
[INFO] [stdout] 4a3dff72a996e374e0d4f598cb3f30b4f603ecac8f840e693e30384502db4d32