[INFO] cloning repository https://github.com/CandySunPlus/rust-linklist
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CandySunPlus/rust-linklist" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCandySunPlus%2Frust-linklist", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCandySunPlus%2Frust-linklist'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2a3db24a368973e9a6a2f2bb24d6cecbec183bb0
[INFO] checking CandySunPlus/rust-linklist/2a3db24a368973e9a6a2f2bb24d6cecbec183bb0 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCandySunPlus%2Frust-linklist" "/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/CandySunPlus/rust-linklist on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/CandySunPlus/rust-linklist
[INFO] finished tweaking git repo https://github.com/CandySunPlus/rust-linklist
[INFO] tweaked toml for git repo https://github.com/CandySunPlus/rust-linklist written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/CandySunPlus/rust-linklist 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" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 92577c71942b9f42fee9f18e88d3b8b642e4f7bc77c0f15915ef8aef2d809727
[INFO] running `Command { std: "docker" "start" "-a" "92577c71942b9f42fee9f18e88d3b8b642e4f7bc77c0f15915ef8aef2d809727", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "92577c71942b9f42fee9f18e88d3b8b642e4f7bc77c0f15915ef8aef2d809727", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92577c71942b9f42fee9f18e88d3b8b642e4f7bc77c0f15915ef8aef2d809727", kill_on_drop: false }`
[INFO] [stdout] 92577c71942b9f42fee9f18e88d3b8b642e4f7bc77c0f15915ef8aef2d809727
[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 -Dtail_expr_drop_order" "-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3f59fb3a8b6735f488a3b43c39118f6badaaa9c36abc533f6e59e4150d2fb591
[INFO] running `Command { std: "docker" "start" "-a" "3f59fb3a8b6735f488a3b43c39118f6badaaa9c36abc533f6e59e4150d2fb591", kill_on_drop: false }`
[INFO] [stderr]     Checking lists v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `back` is never read
[INFO] [stdout]   --> src/six.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct Iter<'a, T> {
[INFO] [stdout]    |            ---- field in this struct
[INFO] [stdout] 19 |     front: Link<T>,
[INFO] [stdout] 20 |     back: Link<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `front`, `back`, and `len` are never read
[INFO] [stdout]   --> src/six.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct IterMut<'a, T> {
[INFO] [stdout]    |            ------- fields in this struct
[INFO] [stdout] 26 |     front: Link<T>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 27 |     back: Link<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 28 |     len: usize,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `list` is never read
[INFO] [stdout]   --> src/six.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub struct IntoIter<T> {
[INFO] [stdout]    |            -------- field in this struct
[INFO] [stdout] 33 |     list: LinkedList<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `back` is never read
[INFO] [stdout]   --> src/six.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct Iter<'a, T> {
[INFO] [stdout]    |            ---- field in this struct
[INFO] [stdout] 19 |     front: Link<T>,
[INFO] [stdout] 20 |     back: Link<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `front`, `back`, and `len` are never read
[INFO] [stdout]   --> src/six.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct IterMut<'a, T> {
[INFO] [stdout]    |            ------- fields in this struct
[INFO] [stdout] 26 |     front: Link<T>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 27 |     back: Link<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 28 |     len: usize,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `list` is never read
[INFO] [stdout]   --> src/six.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub struct IntoIter<T> {
[INFO] [stdout]    |            -------- field in this struct
[INFO] [stdout] 33 |     list: LinkedList<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `Command { std: "docker" "inspect" "3f59fb3a8b6735f488a3b43c39118f6badaaa9c36abc533f6e59e4150d2fb591", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f59fb3a8b6735f488a3b43c39118f6badaaa9c36abc533f6e59e4150d2fb591", kill_on_drop: false }`
[INFO] [stdout] 3f59fb3a8b6735f488a3b43c39118f6badaaa9c36abc533f6e59e4150d2fb591