[INFO] cloning repository https://github.com/markrileybot/rust_dag
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/markrileybot/rust_dag" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarkrileybot%2Frust_dag", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarkrileybot%2Frust_dag'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b2d4e403ff1ebf6c13deecbbc53ef06208795df2
[INFO] checking markrileybot/rust_dag against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarkrileybot%2Frust_dag" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/markrileybot/rust_dag on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/markrileybot/rust_dag
[INFO] finished tweaking git repo https://github.com/markrileybot/rust_dag
[INFO] tweaked toml for git repo https://github.com/markrileybot/rust_dag written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/markrileybot/rust_dag already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 869e6e817baa7d116080c31b5f35589438a81b8113c35c07a70d33b2fea0dae5
[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" "869e6e817baa7d116080c31b5f35589438a81b8113c35c07a70d33b2fea0dae5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "869e6e817baa7d116080c31b5f35589438a81b8113c35c07a70d33b2fea0dae5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "869e6e817baa7d116080c31b5f35589438a81b8113c35c07a70d33b2fea0dae5", kill_on_drop: false }`
[INFO] [stdout] 869e6e817baa7d116080c31b5f35589438a81b8113c35c07a70d33b2fea0dae5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 25d62cdcd69cc19f7c806269177edb819a6613dc27a76320b8fa046e8178dda9
[INFO] running `Command { std: "docker" "start" "-a" "25d62cdcd69cc19f7c806269177edb819a6613dc27a76320b8fa046e8178dda9", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_dag v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `entry`
[INFO] [stdout]   --> src/dag.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     entry: Option<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `head`
[INFO] [stdout]   --> src/dag.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     head: bool,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `tail`
[INFO] [stdout]   --> src/dag.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     tail: bool,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/dag.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_link`
[INFO] [stdout]    --> src/dag.rs:113:8
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn new_link(value: T) -> Link<T> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_singly_linked`
[INFO] [stdout]    --> src/dag.rs:137:8
[INFO] [stdout]     |
[INFO] [stdout] 137 |     fn is_singly_linked(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_island`
[INFO] [stdout]    --> src/dag.rs:146:8
[INFO] [stdout]     |
[INFO] [stdout] 146 |     fn is_island(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `link_out`
[INFO] [stdout]    --> src/dag.rs:153:8
[INFO] [stdout]     |
[INFO] [stdout] 153 |     fn link_out(&mut self, node: Link<T>) {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `link_in`
[INFO] [stdout]    --> src/dag.rs:162:8
[INFO] [stdout]     |
[INFO] [stdout] 162 |     fn link_in(&mut self, node: Link<T>) {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unlink_out`
[INFO] [stdout]    --> src/dag.rs:171:8
[INFO] [stdout]     |
[INFO] [stdout] 171 |     fn unlink_out(&mut self, node: &Link<T>) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unlink_in`
[INFO] [stdout]    --> src/dag.rs:178:8
[INFO] [stdout]     |
[INFO] [stdout] 178 |     fn unlink_in(&mut self, node: &Link<T>) {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_removable_direct_links`
[INFO] [stdout]    --> src/dag.rs:185:8
[INFO] [stdout]     |
[INFO] [stdout] 185 |     fn get_removable_direct_links(&self) -> Vec<Link<T>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_cycle_path`
[INFO] [stdout]    --> src/dag.rs:205:8
[INFO] [stdout]     |
[INFO] [stdout] 205 |     fn get_cycle_path(&self) -> Option<Vec<T>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_cycle_path_internal`
[INFO] [stdout]    --> src/dag.rs:214:8
[INFO] [stdout]     |
[INFO] [stdout] 214 |     fn get_cycle_path_internal(&self, path: &mut Vec<T>) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `link`
[INFO] [stdout]    --> src/dag.rs:232:8
[INFO] [stdout]     |
[INFO] [stdout] 232 |     fn link(node_from: &Link<T>, node_to: &Link<T>) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unlink`
[INFO] [stdout]    --> src/dag.rs:242:8
[INFO] [stdout]     |
[INFO] [stdout] 242 |     fn unlink(node_from: &Link<T>, node_to: &Link<T>) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unlink_all`
[INFO] [stdout]    --> src/dag.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn unlink_all(node_from: &Link<T>) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/dag.rs:333:8
[INFO] [stdout]     |
[INFO] [stdout] 333 |     fn new(map: &'a HashMap<T, Link<T>>) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/dag.rs:387:8
[INFO] [stdout]     |
[INFO] [stdout] 387 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `link`
[INFO] [stdout]    --> src/dag.rs:396:8
[INFO] [stdout]     |
[INFO] [stdout] 396 |     fn link(& mut self, o1: T, o2: T) -> & mut Self {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unlink`
[INFO] [stdout]    --> src/dag.rs:408:8
[INFO] [stdout]     |
[INFO] [stdout] 408 |     fn unlink(&self, o1: &T, o2: &T) -> & Self {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove`
[INFO] [stdout]    --> src/dag.rs:422:8
[INFO] [stdout]     |
[INFO] [stdout] 422 |     fn remove(& mut self, o: &T)  -> & mut Self {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `flatten`
[INFO] [stdout]    --> src/dag.rs:432:8
[INFO] [stdout]     |
[INFO] [stdout] 432 |     fn flatten(&self) {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `sorted_iter`
[INFO] [stdout]    --> src/dag.rs:444:8
[INFO] [stdout]     |
[INFO] [stdout] 444 |     fn sorted_iter(&self) -> SortedIter<T> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_cycles`
[INFO] [stdout]    --> src/dag.rs:451:8
[INFO] [stdout]     |
[INFO] [stdout] 451 |     fn get_cycles(&self, first: bool) -> Vec<Vec<T>> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `contains_cycle`
[INFO] [stdout]    --> src/dag.rs:482:8
[INFO] [stdout]     |
[INFO] [stdout] 482 |     fn contains_cycle(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_singly_linked`
[INFO] [stdout]    --> src/dag.rs:486:8
[INFO] [stdout]     |
[INFO] [stdout] 486 |     fn is_singly_linked(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 27 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_island`
[INFO] [stdout]    --> src/dag.rs:146:8
[INFO] [stdout]     |
[INFO] [stdout] 146 |     fn is_island(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `Command { std: "docker" "inspect" "25d62cdcd69cc19f7c806269177edb819a6613dc27a76320b8fa046e8178dda9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25d62cdcd69cc19f7c806269177edb819a6613dc27a76320b8fa046e8178dda9", kill_on_drop: false }`
[INFO] [stdout] 25d62cdcd69cc19f7c806269177edb819a6613dc27a76320b8fa046e8178dda9