[INFO] cloning repository https://github.com/Pungyeon/rusty-lists
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Pungyeon/rusty-lists" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPungyeon%2Frusty-lists", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPungyeon%2Frusty-lists'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7e84440d222e7b6bdb69f05555b9ff4c1f21a9d8
[INFO] checking Pungyeon/rusty-lists against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPungyeon%2Frusty-lists" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Pungyeon/rusty-lists on toolchain 8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Pungyeon/rusty-lists
[INFO] finished tweaking git repo https://github.com/Pungyeon/rusty-lists
[INFO] tweaked toml for git repo https://github.com/Pungyeon/rusty-lists written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/Pungyeon/rusty-lists already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a6127f87b012025ce46032248b64e6bf39f7e7e92e945b57c177f2caf72d005e
[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" "a6127f87b012025ce46032248b64e6bf39f7e7e92e945b57c177f2caf72d005e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a6127f87b012025ce46032248b64e6bf39f7e7e92e945b57c177f2caf72d005e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6127f87b012025ce46032248b64e6bf39f7e7e92e945b57c177f2caf72d005e", kill_on_drop: false }`
[INFO] [stdout] a6127f87b012025ce46032248b64e6bf39f7e7e92e945b57c177f2caf72d005e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d815397fd26b06e249c69590756d696f5eb2f508d13a1efafe978bedd5037f72
[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" "d815397fd26b06e249c69590756d696f5eb2f508d13a1efafe978bedd5037f72", kill_on_drop: false }`
[INFO] [stderr]     Checking rusty-cart v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::Stack`
[INFO] [stdout]   --> src/lists/stack.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     use super::Stack;
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::BinaryTree`
[INFO] [stdout]   --> src/lists/binary.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |     use super::BinaryTree;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `elem`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:33:24
[INFO] [stdout]    |
[INFO] [stdout] 33 |     pub fn tail(&self, elem: T) -> List<T> {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_elem`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `elem`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:33:24
[INFO] [stdout]    |
[INFO] [stdout] 33 |     pub fn tail(&self, elem: T) -> List<T> {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_elem`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> src/lists/stack.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn peek(&self) -> Option<&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: `iter`
[INFO] [stdout]   --> src/lists/stack.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter_mut`
[INFO] [stdout]   --> src/lists/stack.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn iter_mut(&mut self) -> IterMut<'_, T> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `count`
[INFO] [stdout]   --> src/lists/binary.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub fn count(self) -> usize {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `count`
[INFO] [stdout]   --> src/lists/binary.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn count(self) -> usize {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `List`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct List<T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn append(&self, elem: T) -> List<T> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 |     pub fn tail(&self, elem: T) -> List<T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `head`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn head(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn iter(&self) -> Iter<'_, T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_tail`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 |     fn test_tail() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 |     pub fn tail(&self, elem: T) -> List<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: `head`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn head(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_tail`
[INFO] [stdout]   --> src/lists/persistently_linked.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 |     fn test_tail() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 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 0.49s
[INFO] running `Command { std: "docker" "inspect" "d815397fd26b06e249c69590756d696f5eb2f508d13a1efafe978bedd5037f72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d815397fd26b06e249c69590756d696f5eb2f508d13a1efafe978bedd5037f72", kill_on_drop: false }`
[INFO] [stdout] d815397fd26b06e249c69590756d696f5eb2f508d13a1efafe978bedd5037f72