[INFO] cloning repository https://github.com/simpcl/learning_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/simpcl/learning_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimpcl%2Flearning_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimpcl%2Flearning_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2718991defd52ab4c5aeeafdd7cb668ae4d0d391
[INFO] checking simpcl/learning_rust against master#3aedcf06b73fc36feeebca3d579e1d2a6c40acc5 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimpcl%2Flearning_rust" "/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/simpcl/learning_rust on toolchain 3aedcf06b73fc36feeebca3d579e1d2a6c40acc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/simpcl/learning_rust
[INFO] finished tweaking git repo https://github.com/simpcl/learning_rust
[INFO] tweaked toml for git repo https://github.com/simpcl/learning_rust written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/simpcl/learning_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1c2475c89ec17113f935cf4a81a4ae9183d7e46c5a2f8d03d53478ab2c6ed93c
[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" "1c2475c89ec17113f935cf4a81a4ae9183d7e46c5a2f8d03d53478ab2c6ed93c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1c2475c89ec17113f935cf4a81a4ae9183d7e46c5a2f8d03d53478ab2c6ed93c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c2475c89ec17113f935cf4a81a4ae9183d7e46c5a2f8d03d53478ab2c6ed93c", kill_on_drop: false }`
[INFO] [stdout] 1c2475c89ec17113f935cf4a81a4ae9183d7e46c5a2f8d03d53478ab2c6ed93c
[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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8a9d9e4529e9b39dc96a1872dac37a116631b90ce77e96688ee925741c6189de
[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" "8a9d9e4529e9b39dc96a1872dac37a116631b90ce77e96688ee925741c6189de", kill_on_drop: false }`
[INFO] [stderr]     Checking abc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> src/tree/trie.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn new_trie(n: usize) -> Trie {
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `remove_duplicates`
[INFO] [stdout]  --> src/array/dup.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn remove_duplicates(nums: &mut Vec<i32>) -> usize {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `remove_duplicates2`
[INFO] [stdout]   --> src/array/dup.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn remove_duplicates2(nums: &mut Vec<i32>) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bubble_sort`
[INFO] [stdout]  --> src/array/sort.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn bubble_sort(nums: &mut Vec<i32>) {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Trie`
[INFO] [stdout]  --> src/tree/trie.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Trie {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `new_trie`
[INFO] [stdout]  --> src/tree/trie.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn new_trie(n: usize) -> Trie {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `extend`
[INFO] [stdout]   --> src/tree/trie.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn extend(&mut self) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/tree/trie.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn insert(&mut self, s: &str) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search`
[INFO] [stdout]   --> src/tree/trie.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn search(&self, s: &str) -> usize {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> src/tree/trie.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn new_trie(n: usize) -> Trie {
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` 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 0.98s
[INFO] running `Command { std: "docker" "inspect" "8a9d9e4529e9b39dc96a1872dac37a116631b90ce77e96688ee925741c6189de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a9d9e4529e9b39dc96a1872dac37a116631b90ce77e96688ee925741c6189de", kill_on_drop: false }`
[INFO] [stdout] 8a9d9e4529e9b39dc96a1872dac37a116631b90ce77e96688ee925741c6189de