[INFO] cloning repository https://github.com/yuniruyuni/hobby-linked-list
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yuniruyuni/hobby-linked-list" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuniruyuni%2Fhobby-linked-list", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuniruyuni%2Fhobby-linked-list'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c9fab1fb35b399c0159e4b3a9d3691711e5446a0
[INFO] checking yuniruyuni/hobby-linked-list against try#173780a87744406b7489b28349c0176f14bb3881 for pr-135841
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuniruyuni%2Fhobby-linked-list" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yuniruyuni/hobby-linked-list on toolchain 173780a87744406b7489b28349c0176f14bb3881
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+173780a87744406b7489b28349c0176f14bb3881" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/yuniruyuni/hobby-linked-list
[INFO] finished tweaking git repo https://github.com/yuniruyuni/hobby-linked-list
[INFO] tweaked toml for git repo https://github.com/yuniruyuni/hobby-linked-list written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/yuniruyuni/hobby-linked-list 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" "+173780a87744406b7489b28349c0176f14bb3881" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+173780a87744406b7489b28349c0176f14bb3881" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 112c615c05ee0d32953689c8255bbbb4c19c133cc7673cfbc0ff93d8fbfb65e0
[INFO] running `Command { std: "docker" "start" "-a" "112c615c05ee0d32953689c8255bbbb4c19c133cc7673cfbc0ff93d8fbfb65e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "112c615c05ee0d32953689c8255bbbb4c19c133cc7673cfbc0ff93d8fbfb65e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "112c615c05ee0d32953689c8255bbbb4c19c133cc7673cfbc0ff93d8fbfb65e0", kill_on_drop: false }`
[INFO] [stdout] 112c615c05ee0d32953689c8255bbbb4c19c133cc7673cfbc0ff93d8fbfb65e0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+173780a87744406b7489b28349c0176f14bb3881" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8dc2e650b83218c1f50882f35691107759724b86706133e9a172e9d5213d9e52
[INFO] running `Command { std: "docker" "start" "-a" "8dc2e650b83218c1f50882f35691107759724b86706133e9a172e9d5213d9e52", kill_on_drop: false }`
[INFO] [stderr]     Checking linked-list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: methods `pop_front` and `pop_back` are never used
[INFO] [stdout]   --> src/main.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl<T> LinkedList<T> where T: fmt::Display {
[INFO] [stdout]    | ------------------------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 60 |     fn pop_front(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 67 |     fn pop_back(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.10s
[INFO] running `Command { std: "docker" "inspect" "8dc2e650b83218c1f50882f35691107759724b86706133e9a172e9d5213d9e52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8dc2e650b83218c1f50882f35691107759724b86706133e9a172e9d5213d9e52", kill_on_drop: false }`
[INFO] [stdout] 8dc2e650b83218c1f50882f35691107759724b86706133e9a172e9d5213d9e52