[INFO] cloning repository https://github.com/sgasse/rust_graph
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sgasse/rust_graph" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsgasse%2Frust_graph", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsgasse%2Frust_graph'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 91dd0da1fecdca638ceb9d00dc1459ad3de92ce9
[INFO] checking sgasse/rust_graph against master#a5f164faad4a2fed606b8160fd7ecd2d5cbba381 for pr-84920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsgasse%2Frust_graph" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sgasse/rust_graph on toolchain a5f164faad4a2fed606b8160fd7ecd2d5cbba381
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sgasse/rust_graph
[INFO] finished tweaking git repo https://github.com/sgasse/rust_graph
[INFO] tweaked toml for git repo https://github.com/sgasse/rust_graph written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/sgasse/rust_graph already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-0/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 755c2aa8e916dc7dbb8a11f260d7aec6d23ddd58296301b606586e395ad57aee
[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" "755c2aa8e916dc7dbb8a11f260d7aec6d23ddd58296301b606586e395ad57aee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "755c2aa8e916dc7dbb8a11f260d7aec6d23ddd58296301b606586e395ad57aee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "755c2aa8e916dc7dbb8a11f260d7aec6d23ddd58296301b606586e395ad57aee", kill_on_drop: false }`
[INFO] [stdout] 755c2aa8e916dc7dbb8a11f260d7aec6d23ddd58296301b606586e395ad57aee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 506fc0244d5a926c239bcdfb1793b4ff8fa269f30a97694d4b243a7c33a740cc
[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" "506fc0244d5a926c239bcdfb1793b4ff8fa269f30a97694d4b243a7c33a740cc", kill_on_drop: false }`
[INFO] [stderr]     Checking rgraphs v0.3.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trees/linked_tree.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |     pub fn new<'a>(data: T) -> Node<'a, T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_child_to_parent`
[INFO] [stdout]   --> src/trees/linked_tree.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn add_child_to_parent<'b, T>(parent: &'b Node<'b, T>, child: &'b Node<'b, T>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `LuTree`
[INFO] [stdout]   --> src/trees/lu_tree.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct LuTree<T> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trees/lu_tree.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn new() -> LuTree<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_node`
[INFO] [stdout]   --> src/trees/lu_tree.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn add_node(&mut self, parent: Option<usize>, data: T) -> Result<usize, ()> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set`
[INFO] [stdout]   --> src/trees/lu_tree.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn set(&mut self, node: usize, data: T) -> Result<(), ()> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get`
[INFO] [stdout]   --> src/trees/lu_tree.rs:59:12
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub fn get(&self, node: usize) -> Result<T, ()> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parent`
[INFO] [stdout]   --> src/trees/lu_tree.rs:63:12
[INFO] [stdout]    |
[INFO] [stdout] 63 |     pub fn parent(&self, node: usize) -> Result<usize, ()> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `children`
[INFO] [stdout]   --> src/trees/lu_tree.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn children(&self, node: usize) -> Result<Vec<usize>, ()> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.48s
[INFO] running `Command { std: "docker" "inspect" "506fc0244d5a926c239bcdfb1793b4ff8fa269f30a97694d4b243a7c33a740cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "506fc0244d5a926c239bcdfb1793b4ff8fa269f30a97694d4b243a7c33a740cc", kill_on_drop: false }`
[INFO] [stdout] 506fc0244d5a926c239bcdfb1793b4ff8fa269f30a97694d4b243a7c33a740cc