[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] checking nuclearpesto/rust-binary-tree against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[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 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/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" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--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" "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] 4391cf7aa08492f847bd6c7b38149398a66b4854079f509277a89ababce8c85a
[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" "4391cf7aa08492f847bd6c7b38149398a66b4854079f509277a89ababce8c85a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4391cf7aa08492f847bd6c7b38149398a66b4854079f509277a89ababce8c85a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4391cf7aa08492f847bd6c7b38149398a66b4854079f509277a89ababce8c85a", kill_on_drop: false }`
[INFO] [stdout] 4391cf7aa08492f847bd6c7b38149398a66b4854079f509277a89ababce8c85a
[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=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] 1a7d3afa7c8b31f8c4ffdfab3fce88c1ef1f75a94ab1a581f7674ba2c6e62568
[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" "1a7d3afa7c8b31f8c4ffdfab3fce88c1ef1f75a94ab1a581f7674ba2c6e62568", kill_on_drop: false }`
[INFO] [stderr]     Checking 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]    |                                                              ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[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]    |                                                   ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[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]    |                                   ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[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]    |                                                       ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[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]    |                                                              ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[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]    |                                                   ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[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]    |                                   ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[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]    |                                                       ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[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[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: 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]   = note: `#[warn(dead_code)]` on by default
[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: 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: 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: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0170`.
[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 dev [unoptimized + debuginfo] target(s) in 0.82s
[INFO] running `Command { std: "docker" "inspect" "1a7d3afa7c8b31f8c4ffdfab3fce88c1ef1f75a94ab1a581f7674ba2c6e62568", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a7d3afa7c8b31f8c4ffdfab3fce88c1ef1f75a94ab1a581f7674ba2c6e62568", kill_on_drop: false }`
[INFO] [stdout] 1a7d3afa7c8b31f8c4ffdfab3fce88c1ef1f75a94ab1a581f7674ba2c6e62568