[INFO] cloning repository https://github.com/undeadevs/biterator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/undeadevs/biterator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fundeadevs%2Fbiterator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fundeadevs%2Fbiterator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 50f92647fd019ffff1083b59fb0d63b81a294fd1
[INFO] checking undeadevs/biterator against master#c3def263a44e07e09ae6d57abfc8650227fb4972 for pr-118920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fundeadevs%2Fbiterator" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/undeadevs/biterator on toolchain c3def263a44e07e09ae6d57abfc8650227fb4972
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c3def263a44e07e09ae6d57abfc8650227fb4972" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/undeadevs/biterator
[INFO] finished tweaking git repo https://github.com/undeadevs/biterator
[INFO] tweaked toml for git repo https://github.com/undeadevs/biterator written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/undeadevs/biterator 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" "+c3def263a44e07e09ae6d57abfc8650227fb4972" "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 undeadevs/biterator against try#3931cbb869e499bf6db1e4d580cc247efbf183df for pr-118920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fundeadevs%2Fbiterator" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/undeadevs/biterator on toolchain 3931cbb869e499bf6db1e4d580cc247efbf183df
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3931cbb869e499bf6db1e4d580cc247efbf183df" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/undeadevs/biterator
[INFO] finished tweaking git repo https://github.com/undeadevs/biterator
[INFO] tweaked toml for git repo https://github.com/undeadevs/biterator written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/undeadevs/biterator 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" "+3931cbb869e499bf6db1e4d580cc247efbf183df" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking undeadevs/biterator against try#3931cbb869e499bf6db1e4d580cc247efbf183df for pr-118920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fundeadevs%2Fbiterator" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/undeadevs/biterator on toolchain 3931cbb869e499bf6db1e4d580cc247efbf183df
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3931cbb869e499bf6db1e4d580cc247efbf183df" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/undeadevs/biterator
[INFO] finished tweaking git repo https://github.com/undeadevs/biterator
[INFO] tweaked toml for git repo https://github.com/undeadevs/biterator written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/undeadevs/biterator 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" "+3931cbb869e499bf6db1e4d580cc247efbf183df" "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-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3931cbb869e499bf6db1e4d580cc247efbf183df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 399c8be3eac38a04efdd0158313c6af657dfebf43dea79cd81587b40a889b592
[INFO] running `Command { std: "docker" "start" "-a" "399c8be3eac38a04efdd0158313c6af657dfebf43dea79cd81587b40a889b592", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "399c8be3eac38a04efdd0158313c6af657dfebf43dea79cd81587b40a889b592", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "399c8be3eac38a04efdd0158313c6af657dfebf43dea79cd81587b40a889b592", kill_on_drop: false }`
[INFO] [stdout] 399c8be3eac38a04efdd0158313c6af657dfebf43dea79cd81587b40a889b592
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3931cbb869e499bf6db1e4d580cc247efbf183df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 82e7cc22315ff8e91d57575ebbd032445b10b1e5567e62424c8fd2c042e056f8
[INFO] running `Command { std: "docker" "start" "-a" "82e7cc22315ff8e91d57575ebbd032445b10b1e5567e62424c8fd2c042e056f8", kill_on_drop: false }`
[INFO] [stderr]     Checking biterator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated items `from_vec`, `from_iter`, `next`, and `prev` are never used
[INFO] [stdout]   --> src/lib.rs:8:12
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl<'a, T: 'a> Biterator<T> {
[INFO] [stdout]    | ---------------------------- associated items in this implementation
[INFO] [stdout] 8  |     pub fn from_vec(vec: &[T]) -> Self
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 18 |     pub fn from_iter<I>(iter: I) -> Self
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     pub fn next(&mut self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     pub fn prev(&mut self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] running `Command { std: "docker" "inspect" "82e7cc22315ff8e91d57575ebbd032445b10b1e5567e62424c8fd2c042e056f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82e7cc22315ff8e91d57575ebbd032445b10b1e5567e62424c8fd2c042e056f8", kill_on_drop: false }`
[INFO] [stdout] 82e7cc22315ff8e91d57575ebbd032445b10b1e5567e62424c8fd2c042e056f8