[INFO] cloning repository https://github.com/yushe629/rust_doubly_liked_tree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yushe629/rust_doubly_liked_tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyushe629%2Frust_doubly_liked_tree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyushe629%2Frust_doubly_liked_tree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7fa70077c636d34ab8ea49bf8d2dc97bc874fd88
[INFO] checking yushe629/rust_doubly_liked_tree against master#8c32e313cccf7df531e2d49ffb8227bb92304aee for pr-145608-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyushe629%2Frust_doubly_liked_tree" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/yushe629/rust_doubly_liked_tree
[INFO] finished tweaking git repo https://github.com/yushe629/rust_doubly_liked_tree
[INFO] tweaked toml for git repo https://github.com/yushe629/rust_doubly_liked_tree written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/yushe629/rust_doubly_liked_tree on toolchain 8c32e313cccf7df531e2d49ffb8227bb92304aee
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/yushe629/rust_doubly_liked_tree 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" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f4af091f6b00fa6dbd90a59d9203c3a23d88b38b73662ffa55023480ba4fbfa7
[INFO] running `Command { std: "docker" "start" "-a" "f4af091f6b00fa6dbd90a59d9203c3a23d88b38b73662ffa55023480ba4fbfa7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f4af091f6b00fa6dbd90a59d9203c3a23d88b38b73662ffa55023480ba4fbfa7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4af091f6b00fa6dbd90a59d9203c3a23d88b38b73662ffa55023480ba4fbfa7", kill_on_drop: false }`
[INFO] [stdout] f4af091f6b00fa6dbd90a59d9203c3a23d88b38b73662ffa55023480ba4fbfa7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5835edeb05a1bb3027e0d230a17fa661eb5bf4ffc1d581b9a1de595a6c4f1f31
[INFO] running `Command { std: "docker" "start" "-a" "5835edeb05a1bb3027e0d230a17fa661eb5bf4ffc1d581b9a1de595a6c4f1f31", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_boy v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `pop_front` is never used
[INFO] [stdout]   --> src/main.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl<T: Clone> DoublyLinkedList<T> {
[INFO] [stdout]    | ---------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 40 |     fn pop_front(&mut self) -> Option<T> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `pop_front` is never used
[INFO] [stdout]   --> src/main.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl<T: Clone> DoublyLinkedList<T> {
[INFO] [stdout]    | ---------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 40 |     fn pop_front(&mut self) -> Option<T> {
[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 0.24s
[INFO] running `Command { std: "docker" "inspect" "5835edeb05a1bb3027e0d230a17fa661eb5bf4ffc1d581b9a1de595a6c4f1f31", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5835edeb05a1bb3027e0d230a17fa661eb5bf4ffc1d581b9a1de595a6c4f1f31", kill_on_drop: false }`
[INFO] [stdout] 5835edeb05a1bb3027e0d230a17fa661eb5bf4ffc1d581b9a1de595a6c4f1f31