[INFO] updating cached repository https://github.com/isaacazuelos/rs_gc_dead_end
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 38eb6324bcc278465b11a905cc72a55e380626c3
[INFO] checking isaacazuelos/rs_gc_dead_end against try#0ab79c4b48ad19260fa46623f452c1b403a360e8 for pr-74315
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fisaacazuelos%2Frs_gc_dead_end" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/isaacazuelos/rs_gc_dead_end on toolchain 0ab79c4b48ad19260fa46623f452c1b403a360e8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/isaacazuelos/rs_gc_dead_end
[INFO] finished tweaking git repo https://github.com/isaacazuelos/rs_gc_dead_end
[INFO] tweaked toml for git repo https://github.com/isaacazuelos/rs_gc_dead_end written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/isaacazuelos/rs_gc_dead_end already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 644578839e4538731ce92f866bfc4a5ec619cec121d7d9c0165f821fedcf9697
[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" "644578839e4538731ce92f866bfc4a5ec619cec121d7d9c0165f821fedcf9697", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "644578839e4538731ce92f866bfc4a5ec619cec121d7d9c0165f821fedcf9697", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "644578839e4538731ce92f866bfc4a5ec619cec121d7d9c0165f821fedcf9697", kill_on_drop: false }`
[INFO] [stdout] 644578839e4538731ce92f866bfc4a5ec619cec121d7d9c0165f821fedcf9697
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b236551ea8b3ddd1ae0bf4db77c541b998cad49f1a9d5f5814caa475f259bafe
[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" "b236551ea8b3ddd1ae0bf4db77c541b998cad49f1a9d5f5814caa475f259bafe", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking gc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/main.rs:164:9
[INFO] [stdout]     |
[INFO] [stdout] 164 |     let a = heap.intern(Node::new("a"));
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:165:9
[INFO] [stdout]     |
[INFO] [stdout] 165 |     let b = heap.intern(Node::new("b"));
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `root`
[INFO] [stdout]   --> src/main.rs:85:24
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn mark(&mut self, root: &mut Gc<T>) {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_root`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `collect`
[INFO] [stdout]   --> src/main.rs:80:8
[INFO] [stdout]    |
[INFO] [stdout] 80 |     fn collect(&mut self, root: &mut Gc<T>) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mark`
[INFO] [stdout]   --> src/main.rs:85:8
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn mark(&mut self, root: &mut Gc<T>) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `sweep`
[INFO] [stdout]   --> src/main.rs:89:15
[INFO] [stdout]    |
[INFO] [stdout] 89 |     unsafe fn sweep(&mut self) {
[INFO] [stdout]    |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push_edge`
[INFO] [stdout]    --> src/main.rs:152:8
[INFO] [stdout]     |
[INFO] [stdout] 152 |     fn push_edge(&'a mut self, edge: Gc<'a, Node<'a>>) {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/main.rs:164:9
[INFO] [stdout]     |
[INFO] [stdout] 164 |     let a = heap.intern(Node::new("a"));
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:165:9
[INFO] [stdout]     |
[INFO] [stdout] 165 |     let b = heap.intern(Node::new("b"));
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `root`
[INFO] [stdout]   --> src/main.rs:85:24
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn mark(&mut self, root: &mut Gc<T>) {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_root`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `collect`
[INFO] [stdout]   --> src/main.rs:80:8
[INFO] [stdout]    |
[INFO] [stdout] 80 |     fn collect(&mut self, root: &mut Gc<T>) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mark`
[INFO] [stdout]   --> src/main.rs:85:8
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn mark(&mut self, root: &mut Gc<T>) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `sweep`
[INFO] [stdout]   --> src/main.rs:89:15
[INFO] [stdout]    |
[INFO] [stdout] 89 |     unsafe fn sweep(&mut self) {
[INFO] [stdout]    |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push_edge`
[INFO] [stdout]    --> src/main.rs:152:8
[INFO] [stdout]     |
[INFO] [stdout] 152 |     fn push_edge(&'a mut self, edge: Gc<'a, Node<'a>>) {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.96s
[INFO] running `Command { std: "docker" "inspect" "b236551ea8b3ddd1ae0bf4db77c541b998cad49f1a9d5f5814caa475f259bafe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b236551ea8b3ddd1ae0bf4db77c541b998cad49f1a9d5f5814caa475f259bafe", kill_on_drop: false }`
[INFO] [stdout] b236551ea8b3ddd1ae0bf4db77c541b998cad49f1a9d5f5814caa475f259bafe