[INFO] cloning repository https://github.com/thealmarty/skip_lists_sorted
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/thealmarty/skip_lists_sorted" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthealmarty%2Fskip_lists_sorted", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthealmarty%2Fskip_lists_sorted'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 64298ce32403180f90a7baedb72ab0f956de26fe
[INFO] checking thealmarty/skip_lists_sorted against try#8de4b308b608cded0ebccf658a0fc719bce87d4e for pr-89056
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthealmarty%2Fskip_lists_sorted" "/workspace/builds/worker-84/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-84/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/thealmarty/skip_lists_sorted on toolchain 8de4b308b608cded0ebccf658a0fc719bce87d4e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/thealmarty/skip_lists_sorted
[INFO] finished tweaking git repo https://github.com/thealmarty/skip_lists_sorted
[INFO] tweaked toml for git repo https://github.com/thealmarty/skip_lists_sorted written to /workspace/builds/worker-84/source/Cargo.toml
[INFO] crate git repo https://github.com/thealmarty/skip_lists_sorted already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "fetch" "--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-84/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bd50c8a83597c8fb2ef40982cb5f69e52c5e3f07adb67cd8c165d1d85c33aa7e
[INFO] running `Command { std: "docker" "start" "-a" "bd50c8a83597c8fb2ef40982cb5f69e52c5e3f07adb67cd8c165d1d85c33aa7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd50c8a83597c8fb2ef40982cb5f69e52c5e3f07adb67cd8c165d1d85c33aa7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd50c8a83597c8fb2ef40982cb5f69e52c5e3f07adb67cd8c165d1d85c33aa7e", kill_on_drop: false }`
[INFO] [stdout] bd50c8a83597c8fb2ef40982cb5f69e52c5e3f07adb67cd8c165d1d85c33aa7e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 77eeea93387856a6bc23c3ddc0e68c45dc9b6fcc5c0e37cbb309d9792570d3fe
[INFO] running `Command { std: "docker" "start" "-a" "77eeea93387856a6bc23c3ddc0e68c45dc9b6fcc5c0e37cbb309d9792570d3fe", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking fastrand v1.4.0
[INFO] [stderr]     Checking skip_lists_sorted v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `val`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     val: T,              // the element/value
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `next`
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     next: VecOfNodes<T>, // a list of next nodes
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `SkipList`
[INFO] [stdout]   --> src/main.rs:23:1
[INFO] [stdout]    |
[INFO] [stdout] 23 | type SkipList<T> = Vec<ArcNode<T>>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_node`
[INFO] [stdout]   --> src/main.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn find_node<T: Ord>(val: T, slist: SkipList<T>) -> Option<ArcNode<T>> {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `val`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     val: T,              // the element/value
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `next`
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     next: VecOfNodes<T>, // a list of next nodes
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `SkipList`
[INFO] [stdout]   --> src/main.rs:23:1
[INFO] [stdout]    |
[INFO] [stdout] 23 | type SkipList<T> = Vec<ArcNode<T>>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_node`
[INFO] [stdout]   --> src/main.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn find_node<T: Ord>(val: T, slist: SkipList<T>) -> Option<ArcNode<T>> {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.74s
[INFO] running `Command { std: "docker" "inspect" "77eeea93387856a6bc23c3ddc0e68c45dc9b6fcc5c0e37cbb309d9792570d3fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77eeea93387856a6bc23c3ddc0e68c45dc9b6fcc5c0e37cbb309d9792570d3fe", kill_on_drop: false }`
[INFO] [stdout] 77eeea93387856a6bc23c3ddc0e68c45dc9b6fcc5c0e37cbb309d9792570d3fe