[INFO] cloning repository https://github.com/nuclearpesto/rust-binary-tree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nuclearpesto/rust-binary-tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnuclearpesto%2Frust-binary-tree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnuclearpesto%2Frust-binary-tree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e03f93f02462e0ed812e0d43f525598f29b072aa
[INFO] testing nuclearpesto/rust-binary-tree against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnuclearpesto%2Frust-binary-tree" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nuclearpesto/rust-binary-tree on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nuclearpesto/rust-binary-tree
[INFO] finished tweaking git repo https://github.com/nuclearpesto/rust-binary-tree
[INFO] tweaked toml for git repo https://github.com/nuclearpesto/rust-binary-tree written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/nuclearpesto/rust-binary-tree already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", 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] aa6a26edeea5d07a1323fbe9c40eb5cc31fa5e5b3b5b7cfc291accd6e5814fe6
[INFO] running `Command { std: "docker" "start" "-a" "aa6a26edeea5d07a1323fbe9c40eb5cc31fa5e5b3b5b7cfc291accd6e5814fe6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa6a26edeea5d07a1323fbe9c40eb5cc31fa5e5b3b5b7cfc291accd6e5814fe6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa6a26edeea5d07a1323fbe9c40eb5cc31fa5e5b3b5b7cfc291accd6e5814fe6", kill_on_drop: false }`
[INFO] [stdout] aa6a26edeea5d07a1323fbe9c40eb5cc31fa5e5b3b5b7cfc291accd6e5814fe6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=warn" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--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] b0085e98a32221bd847b490550ca774f992ff8a8adde92986f884c2a3329df5a
[INFO] running `Command { std: "docker" "start" "-a" "b0085e98a32221bd847b490550ca774f992ff8a8adde92986f884c2a3329df5a", kill_on_drop: false }`
[INFO] [stderr]    Compiling binarytree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/main.rs:28:62
[INFO] [stdout]    |
[INFO] [stdout] 28 |         pub fn insert(tree: &Option<Rc<Node>>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |                                                              ^                ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 28 -         pub fn insert(tree: &Option<Rc<Node>>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout] 28 +         pub fn insert(tree: &Option<Rc<Node>>, key: &str) -> Option<Rc<Node>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/main.rs:35:51
[INFO] [stdout]    |
[INFO] [stdout] 35 |         fn clone_node(node: &Option<Rc<Node>>) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |                                                   ^                ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 35 -         fn clone_node(node: &Option<Rc<Node>>) -> (Option<Rc<Node>>) {
[INFO] [stdout] 35 +         fn clone_node(node: &Option<Rc<Node>>) -> Option<Rc<Node>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/main.rs:41:35
[INFO] [stdout]    |
[INFO] [stdout] 41 |         fn new_leaf(key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |                                   ^                ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 41 -         fn new_leaf(key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout] 41 +         fn new_leaf(key: &str) -> Option<Rc<Node>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/main.rs:49:55
[INFO] [stdout]    |
[INFO] [stdout] 49 |         fn tree_by_key(tree: &Rc<Node>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |                                                       ^                ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 49 -         fn tree_by_key(tree: &Rc<Node>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout] 49 +         fn tree_by_key(tree: &Rc<Node>, key: &str) -> Option<Rc<Node>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning[E0170]: pattern binding `Less` is named the same as one of the variants of the type `std::cmp::Ordering`
[INFO] [stdout]   --> src/main.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 Less => {
[INFO] [stdout]    |                 ^^^^ help: to match on the variant, qualify the path: `std::cmp::Ordering::Less`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning[E0170]: pattern binding `Equal` is named the same as one of the variants of the type `std::cmp::Ordering`
[INFO] [stdout]   --> src/main.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |                 Equal => {
[INFO] [stdout]    |                 ^^^^^ help: to match on the variant, qualify the path: `std::cmp::Ordering::Equal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/main.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 Less => {
[INFO] [stdout]    |                 ---- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 61 |                 More => {
[INFO] [stdout]    |                 ^^^^ unreachable pattern
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/main.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 Less => {
[INFO] [stdout]    |                 ---- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 67 |                 Equal => {
[INFO] [stdout]    |                 ^^^^^ unreachable pattern
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Less`
[INFO] [stdout]   --> src/main.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 Less => {
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_Less`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `More`
[INFO] [stdout]   --> src/main.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 |                 More => {
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_More`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Equal`
[INFO] [stdout]   --> src/main.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |                 Equal => {
[INFO] [stdout]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_Equal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `root`
[INFO] [stdout]  --> src/main.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         root: Rc<Node>,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `BTree` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/main.rs:3:14
[INFO] [stdout]   |
[INFO] [stdout] 3 |     #[derive(Debug)]
[INFO] [stdout]   |              ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]  --> src/main.rs:8:16
[INFO] [stdout]   |
[INFO] [stdout] 8 |         pub fn insert(tree: &BTree, key: &str) -> BTree {
[INFO] [stdout]   |                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/main.rs:13:16
[INFO] [stdout]    |
[INFO] [stdout] 13 |         pub fn new(key: &str) -> BTree {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `left`
[INFO] [stdout]   --> src/main.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |         left: Option<Rc<Node>>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/main.rs:20:14
[INFO] [stdout]    |
[INFO] [stdout] 20 |     #[derive(Debug)]
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `right`
[INFO] [stdout]   --> src/main.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |         right: Option<Rc<Node>>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/main.rs:20:14
[INFO] [stdout]    |
[INFO] [stdout] 20 |     #[derive(Debug)]
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `key`
[INFO] [stdout]   --> src/main.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |         key: String,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/main.rs:20:14
[INFO] [stdout]    |
[INFO] [stdout] 20 |     #[derive(Debug)]
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/main.rs:28:16
[INFO] [stdout]    |
[INFO] [stdout] 28 |         pub fn insert(tree: &Option<Rc<Node>>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `clone_node`
[INFO] [stdout]   --> src/main.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |         fn clone_node(node: &Option<Rc<Node>>) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_leaf`
[INFO] [stdout]   --> src/main.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |         fn new_leaf(key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tree_by_key`
[INFO] [stdout]   --> src/main.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |         fn tree_by_key(tree: &Rc<Node>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Less` should have a snake case name
[INFO] [stdout]   --> src/main.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 Less => {
[INFO] [stdout]    |                 ^^^^ help: convert the identifier to snake case: `less`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `More` should have a snake case name
[INFO] [stdout]   --> src/main.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 |                 More => {
[INFO] [stdout]    |                 ^^^^ help: convert the identifier to snake case: `more`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Equal` should have a snake case name
[INFO] [stdout]   --> src/main.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |                 Equal => {
[INFO] [stdout]    |                 ^^^^^ help: convert the identifier to snake case: `equal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0170`.
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.82s
[INFO] running `Command { std: "docker" "inspect" "b0085e98a32221bd847b490550ca774f992ff8a8adde92986f884c2a3329df5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0085e98a32221bd847b490550ca774f992ff8a8adde92986f884c2a3329df5a", kill_on_drop: false }`
[INFO] [stdout] b0085e98a32221bd847b490550ca774f992ff8a8adde92986f884c2a3329df5a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=warn" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 217367a88c5ca1c723f4ef34f87c8b46e7ac61673c2eb9ca8a1ec4993b8b2cb7
[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" "217367a88c5ca1c723f4ef34f87c8b46e7ac61673c2eb9ca8a1ec4993b8b2cb7", kill_on_drop: false }`
[INFO] [stderr]    Compiling binarytree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/main.rs:28:62
[INFO] [stdout]    |
[INFO] [stdout] 28 |         pub fn insert(tree: &Option<Rc<Node>>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |                                                              ^                ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 28 -         pub fn insert(tree: &Option<Rc<Node>>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout] 28 +         pub fn insert(tree: &Option<Rc<Node>>, key: &str) -> Option<Rc<Node>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/main.rs:35:51
[INFO] [stdout]    |
[INFO] [stdout] 35 |         fn clone_node(node: &Option<Rc<Node>>) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |                                                   ^                ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 35 -         fn clone_node(node: &Option<Rc<Node>>) -> (Option<Rc<Node>>) {
[INFO] [stdout] 35 +         fn clone_node(node: &Option<Rc<Node>>) -> Option<Rc<Node>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/main.rs:41:35
[INFO] [stdout]    |
[INFO] [stdout] 41 |         fn new_leaf(key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |                                   ^                ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 41 -         fn new_leaf(key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout] 41 +         fn new_leaf(key: &str) -> Option<Rc<Node>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/main.rs:49:55
[INFO] [stdout]    |
[INFO] [stdout] 49 |         fn tree_by_key(tree: &Rc<Node>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout]    |                                                       ^                ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 49 -         fn tree_by_key(tree: &Rc<Node>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stdout] 49 +         fn tree_by_key(tree: &Rc<Node>, key: &str) -> Option<Rc<Node>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning[E0170]: pattern binding `Less` is named the same as one of the variants of the type `std::cmp::Ordering`
[INFO] [stdout]   --> src/main.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 Less => {
[INFO] [stdout]    |                 ^^^^ help: to match on the variant, qualify the path: `std::cmp::Ordering::Less`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning[E0170]: pattern binding `Equal` is named the same as one of the variants of the type `std::cmp::Ordering`
[INFO] [stdout]   --> src/main.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |                 Equal => {
[INFO] [stdout]    |                 ^^^^^ help: to match on the variant, qualify the path: `std::cmp::Ordering::Equal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/main.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 Less => {
[INFO] [stdout]    |                 ---- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 61 |                 More => {
[INFO] [stdout]    |                 ^^^^ unreachable pattern
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/main.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 Less => {
[INFO] [stdout]    |                 ---- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 67 |                 Equal => {
[INFO] [stdout]    |                 ^^^^^ unreachable pattern
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Less`
[INFO] [stdout]   --> src/main.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 Less => {
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_Less`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `More`
[INFO] [stdout]   --> src/main.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 |                 More => {
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_More`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Equal`
[INFO] [stdout]   --> src/main.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |                 Equal => {
[INFO] [stdout]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_Equal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Less` should have a snake case name
[INFO] [stdout]   --> src/main.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 Less => {
[INFO] [stdout]    |                 ^^^^ help: convert the identifier to snake case: `less`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `More` should have a snake case name
[INFO] [stdout]   --> src/main.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 |                 More => {
[INFO] [stdout]    |                 ^^^^ help: convert the identifier to snake case: `more`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Equal` should have a snake case name
[INFO] [stdout]   --> src/main.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |                 Equal => {
[INFO] [stdout]    |                 ^^^^^ help: convert the identifier to snake case: `equal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0170`.
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.09s
[INFO] running `Command { std: "docker" "inspect" "217367a88c5ca1c723f4ef34f87c8b46e7ac61673c2eb9ca8a1ec4993b8b2cb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "217367a88c5ca1c723f4ef34f87c8b46e7ac61673c2eb9ca8a1ec4993b8b2cb7", kill_on_drop: false }`
[INFO] [stdout] 217367a88c5ca1c723f4ef34f87c8b46e7ac61673c2eb9ca8a1ec4993b8b2cb7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=warn" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", 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] 77a53df7b8b7f814967a8d1016b1562b9696766052b9a9a8e82d708972f164a3
[INFO] running `Command { std: "docker" "start" "-a" "77a53df7b8b7f814967a8d1016b1562b9696766052b9a9a8e82d708972f164a3", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stdout] running 2 tests
[INFO] [stderr]   --> src/main.rs:28:62
[INFO] [stderr]    |
[INFO] [stderr] 28 |         pub fn insert(tree: &Option<Rc<Node>>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stderr]    |                                                              ^                ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 28 -         pub fn insert(tree: &Option<Rc<Node>>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stderr] 28 +         pub fn insert(tree: &Option<Rc<Node>>, key: &str) -> Option<Rc<Node>> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/main.rs:35:51
[INFO] [stderr]    |
[INFO] [stderr] 35 |         fn clone_node(node: &Option<Rc<Node>>) -> (Option<Rc<Node>>) {
[INFO] [stderr]    |                                                   ^                ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 35 -         fn clone_node(node: &Option<Rc<Node>>) -> (Option<Rc<Node>>) {
[INFO] [stderr] 35 +         fn clone_node(node: &Option<Rc<Node>>) -> Option<Rc<Node>> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/main.rs:41:35
[INFO] [stderr]    |
[INFO] [stderr] 41 |         fn new_leaf(key: &str) -> (Option<Rc<Node>>) {
[INFO] [stderr]    |                                   ^                ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 41 -         fn new_leaf(key: &str) -> (Option<Rc<Node>>) {
[INFO] [stderr] 41 +         fn new_leaf(key: &str) -> Option<Rc<Node>> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/main.rs:49:55
[INFO] [stderr]    |
[INFO] [stderr] 49 |         fn tree_by_key(tree: &Rc<Node>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stderr]    |                                                       ^                ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 49 -         fn tree_by_key(tree: &Rc<Node>, key: &str) -> (Option<Rc<Node>>) {
[INFO] [stderr] 49 +         fn tree_by_key(tree: &Rc<Node>, key: &str) -> Option<Rc<Node>> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `Less` is named the same as one of the variants of the type `std::cmp::Ordering`
[INFO] [stderr]   --> src/main.rs:55:17
[INFO] [stderr]    |
[INFO] [stderr] 55 |                 Less => {
[INFO] [stderr]    |                 ^^^^ help: to match on the variant, qualify the path: `std::cmp::Ordering::Less`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `Equal` is named the same as one of the variants of the type `std::cmp::Ordering`
[INFO] [stderr]   --> src/main.rs:67:17
[INFO] [stderr]    |
[INFO] [stderr] 67 |                 Equal => {
[INFO] [stderr]    |                 ^^^^^ help: to match on the variant, qualify the path: `std::cmp::Ordering::Equal`
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]   --> src/main.rs:61:17
[INFO] [stderr]    |
[INFO] [stderr] 55 |                 Less => {
[INFO] [stderr]    |                 ---- matches any value
[INFO] [stderr] ...
[INFO] [stderr] 61 |                 More => {
[INFO] [stderr]    |                 ^^^^ unreachable pattern
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]   --> src/main.rs:67:17
[INFO] [stderr]    |
[INFO] [stderr] 55 |                 Less => {
[INFO] [stderr]    |                 ---- matches any value
[INFO] [stderr] ...
[INFO] [stderr] 67 |                 Equal => {
[INFO] [stderr]    |                 ^^^^^ unreachable pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `Less`
[INFO] [stderr]   --> src/main.rs:55:17
[INFO] [stderr]    |
[INFO] [stderr] 55 |                 Less => {
[INFO] [stderr]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_Less`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `More`
[INFO] [stderr]   --> src/main.rs:61:17
[INFO] [stderr]    |
[INFO] [stderr] 61 |                 More => {
[INFO] [stderr]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_More`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `Equal`
[INFO] [stderr]   --> src/main.rs:67:17
[INFO] [stderr]    |
[INFO] [stderr] 67 |                 Equal => {
[INFO] [stderr]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_Equal`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Less` should have a snake case name
[INFO] [stderr]   --> src/main.rs:55:17
[INFO] [stderr]    |
[INFO] [stderr] 55 |                 Less => {
[INFO] [stderr]    |                 ^^^^ help: convert the identifier to snake case: `less`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `More` should have a snake case name
[INFO] [stderr]   --> src/main.rs:61:17
[INFO] [stderr]    |
[INFO] [stderr] 61 |                 More => {
[INFO] [stderr]    |                 ^^^^ help: convert the identifier to snake case: `more`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Equal` should have a snake case name
[INFO] [stderr]   --> src/main.rs:67:17
[INFO] [stderr]    |
[INFO] [stderr] 67 |                 Equal => {
[INFO] [stderr]    |                 ^^^^^ help: convert the identifier to snake case: `equal`
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0170`.
[INFO] [stderr] warning: `binarytree` (bin "binarytree" test) generated 14 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/binarytree-0ff34eb26023dce8)
[INFO] [stdout] test tree::test::new_btree_works ... ok
[INFO] [stdout] test tree::test::insert_one_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "77a53df7b8b7f814967a8d1016b1562b9696766052b9a9a8e82d708972f164a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77a53df7b8b7f814967a8d1016b1562b9696766052b9a9a8e82d708972f164a3", kill_on_drop: false }`
[INFO] [stdout] 77a53df7b8b7f814967a8d1016b1562b9696766052b9a9a8e82d708972f164a3