[INFO] cloning repository https://github.com/I-have-no-idea-what-I-am-coding/algorithm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/I-have-no-idea-what-I-am-coding/algorithm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FI-have-no-idea-what-I-am-coding%2Falgorithm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FI-have-no-idea-what-I-am-coding%2Falgorithm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b176d9b98d3add8aae78d47e84f7d2b597f9f227
[INFO] checking I-have-no-idea-what-I-am-coding/algorithm against master#0d37dca25a51fb900a402c94c8818ad1c2789e30 for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FI-have-no-idea-what-I-am-coding%2Falgorithm" "/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/I-have-no-idea-what-I-am-coding/algorithm on toolchain 0d37dca25a51fb900a402c94c8818ad1c2789e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/I-have-no-idea-what-I-am-coding/algorithm
[INFO] finished tweaking git repo https://github.com/I-have-no-idea-what-I-am-coding/algorithm
[INFO] tweaked toml for git repo https://github.com/I-have-no-idea-what-I-am-coding/algorithm written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/I-have-no-idea-what-I-am-coding/algorithm already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "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" "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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ae5ec3c4046da9e2d6913b39c8743a10ff26c021b81bf057de5e64105e3c3e36
[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" "ae5ec3c4046da9e2d6913b39c8743a10ff26c021b81bf057de5e64105e3c3e36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ae5ec3c4046da9e2d6913b39c8743a10ff26c021b81bf057de5e64105e3c3e36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae5ec3c4046da9e2d6913b39c8743a10ff26c021b81bf057de5e64105e3c3e36", kill_on_drop: false }`
[INFO] [stdout] ae5ec3c4046da9e2d6913b39c8743a10ff26c021b81bf057de5e64105e3c3e36
[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" "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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ce7b23228c6d4fa094e3f75902c32b0f1d818e60bbc643bcea01dad6f6d992c
[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" "2ce7b23228c6d4fa094e3f75902c32b0f1d818e60bbc643bcea01dad6f6d992c", kill_on_drop: false }`
[INFO] [stderr]     Checking algorithm v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Ref`
[INFO] [stdout]  --> src/leetcode/structs/tree_node.rs:1:26
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{RefCell, Ref};
[INFO] [stdout]   |                          ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ref`
[INFO] [stdout]  --> src/leetcode/structs/tree_node.rs:1:26
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{RefCell, Ref};
[INFO] [stdout]   |                          ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]   --> src/leetcode/structs/tree_node.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     use std::ops::Deref;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/leetcode/lc104.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::RefCell`
[INFO] [stdout]   --> src/leetcode/lc104.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/leetcode/structs/tree_node.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 |     pub fn new(val: i32) -> Self {
[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: `create_from_vec`
[INFO] [stdout]   --> src/leetcode/structs/tree_node.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn create_from_vec(vec: Vec<Option<i32>>) -> Rc<RefCell<Self>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Solution`
[INFO] [stdout]   --> src/leetcode/lc104.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | struct Solution {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `max_depth1`
[INFO] [stdout]   --> src/leetcode/lc104.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn max_depth1(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `max_depth2`
[INFO] [stdout]    --> src/leetcode/lc104.rs:100:12
[INFO] [stdout]     |
[INFO] [stdout] 100 |     pub fn max_depth2(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 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 1.05s
[INFO] running `Command { std: "docker" "inspect" "2ce7b23228c6d4fa094e3f75902c32b0f1d818e60bbc643bcea01dad6f6d992c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ce7b23228c6d4fa094e3f75902c32b0f1d818e60bbc643bcea01dad6f6d992c", kill_on_drop: false }`
[INFO] [stdout] 2ce7b23228c6d4fa094e3f75902c32b0f1d818e60bbc643bcea01dad6f6d992c