[INFO] updating cached repository https://github.com/shakyShane/dsa
[INFO] running `"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"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f568a86f40d36d21098b743aa75fb478cdeb75a6
[INFO] checking shakyShane/dsa against try#f149601db42efe10ece8b284ab681fd4a6fcb89c for pr-68766
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FshakyShane%2Fdsa" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shakyShane/dsa on toolchain f149601db42efe10ece8b284ab681fd4a6fcb89c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+f149601db42efe10ece8b284ab681fd4a6fcb89c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/shakyShane/dsa
[INFO] finished tweaking git repo https://github.com/shakyShane/dsa
[INFO] tweaked toml for git repo https://github.com/shakyShane/dsa written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/shakyShane/dsa already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+f149601db42efe10ece8b284ab681fd4a6fcb89c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "/opt/rustwide/cargo-home/bin/cargo" "+f149601db42efe10ece8b284ab681fd4a6fcb89c" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7b99b548480a325fd1fbbb45adb74d922c757ce9b402577632f1fd1438f3b956
[INFO] running `"docker" "start" "-a" "7b99b548480a325fd1fbbb45adb74d922c757ce9b402577632f1fd1438f3b956"`
[INFO] [stderr]     Checking dsa v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `root`
[INFO] [stderr]   --> src/serialize_tree.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |     let root = Node::new("1",
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_root`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `binary_search`
[INFO] [stderr]   --> src/binary_search.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub fn binary_search(k: i32, items: &Vec<i32>) -> Option<i32> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/unival_subtrees.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn new(value: impl Into<String>, left: Option<Box<Node>>, right: Option<Box<Node>>) -> Node {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `count_unival_subtrees`
[INFO] [stderr]   --> src/unival_subtrees.rs:40:4
[INFO] [stderr]    |
[INFO] [stderr] 40 | fn count_unival_subtrees(root: &Option<Box<Node>>) -> (usize, bool) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/serialize_tree.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn new(value: impl Into<String>, left: Option<Box<Node>>, right: Option<Box<Node>>) -> Node {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `serialize`
[INFO] [stderr]   --> src/serialize_tree.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     pub fn serialize(root: &Option<Box<Node>>) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Tree`
[INFO] [stderr]   --> src/serialize_tree.rs:32:8
[INFO] [stderr]    |
[INFO] [stderr] 32 | struct Tree {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `deserialize`
[INFO] [stderr]   --> src/serialize_tree.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     pub fn deserialize(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `from_str`
[INFO] [stderr]   --> src/serialize_tree.rs:61:5
[INFO] [stderr]    |
[INFO] [stderr] 61 |     pub fn from_str(input: impl Into<String>) -> Tree {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.65s
[INFO] running `"docker" "inspect" "7b99b548480a325fd1fbbb45adb74d922c757ce9b402577632f1fd1438f3b956"`
[INFO] running `"docker" "rm" "-f" "7b99b548480a325fd1fbbb45adb74d922c757ce9b402577632f1fd1438f3b956"`
[INFO] [stdout] 7b99b548480a325fd1fbbb45adb74d922c757ce9b402577632f1fd1438f3b956