[INFO] cloning repository https://github.com/hnefatl/rust-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/hnefatl/rust-linked-lists" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhnefatl%2Frust-linked-lists", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhnefatl%2Frust-linked-lists'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fc93bdcc2983f22ccbacc827da29434854e1c82f
[INFO] checking hnefatl/rust-linked-lists against try#3e22d1f9053c0fc87629b3c6d5d9567856368e5d for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhnefatl%2Frust-linked-lists" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hnefatl/rust-linked-lists on toolchain 3e22d1f9053c0fc87629b3c6d5d9567856368e5d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e22d1f9053c0fc87629b3c6d5d9567856368e5d" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hnefatl/rust-linked-lists
[INFO] finished tweaking git repo https://github.com/hnefatl/rust-linked-lists
[INFO] tweaked toml for git repo https://github.com/hnefatl/rust-linked-lists written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/hnefatl/rust-linked-lists already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e22d1f9053c0fc87629b3c6d5d9567856368e5d" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+3e22d1f9053c0fc87629b3c6d5d9567856368e5d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 790caddec1e035721a8d6f5e9d42535cb7e67fe1911f6ca88cf54c4c5a2b7135
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "790caddec1e035721a8d6f5e9d42535cb7e67fe1911f6ca88cf54c4c5a2b7135", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "790caddec1e035721a8d6f5e9d42535cb7e67fe1911f6ca88cf54c4c5a2b7135", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "790caddec1e035721a8d6f5e9d42535cb7e67fe1911f6ca88cf54c4c5a2b7135", kill_on_drop: false }`
[INFO] [stdout] 790caddec1e035721a8d6f5e9d42535cb7e67fe1911f6ca88cf54c4c5a2b7135
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+3e22d1f9053c0fc87629b3c6d5d9567856368e5d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e0179969fbc5386460dc121114663043db75dd5f365478381a5009957777ccde
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e0179969fbc5386460dc121114663043db75dd5f365478381a5009957777ccde", kill_on_drop: false }`
[INFO] [stderr]     Checking strum v0.15.0
[INFO] [stderr]     Checking getrandom v0.1.9
[INFO] [stderr]    Compiling strum_macros v0.15.0
[INFO] [stderr]     Checking rand_core v0.5.0
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking linked-lists v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/singlelinked.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn new() -> SingleLinked<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `traverse_with`
[INFO] [stdout]   --> src/singlelinked.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn traverse_with<F>(&mut self, f: F) where F: Fn(&mut T, &mut Node<T>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `traverse_with`
[INFO] [stdout]   --> src/singlelinked.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn traverse_with<F>(&mut self, f: F) where F: Fn(&mut T, &mut Node<T>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.12s
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "e0179969fbc5386460dc121114663043db75dd5f365478381a5009957777ccde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0179969fbc5386460dc121114663043db75dd5f365478381a5009957777ccde", kill_on_drop: false }`
[INFO] [stdout] e0179969fbc5386460dc121114663043db75dd5f365478381a5009957777ccde