[INFO] cloning repository https://github.com/gopik/btree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gopik/btree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgopik%2Fbtree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgopik%2Fbtree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 59ee7607631d96d93220afe01bccac86c9bc0af9
[INFO] checking gopik/btree against try#8de4b308b608cded0ebccf658a0fc719bce87d4e for pr-89056
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgopik%2Fbtree" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gopik/btree on toolchain 8de4b308b608cded0ebccf658a0fc719bce87d4e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gopik/btree
[INFO] finished tweaking git repo https://github.com/gopik/btree
[INFO] tweaked toml for git repo https://github.com/gopik/btree written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/gopik/btree already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded test-env-log v0.2.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 70408f1d3e7ea0877c40aa9b11bd46d715a4067c7ac95a7188932ca65f714f85
[INFO] running `Command { std: "docker" "start" "-a" "70408f1d3e7ea0877c40aa9b11bd46d715a4067c7ac95a7188932ca65f714f85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "70408f1d3e7ea0877c40aa9b11bd46d715a4067c7ac95a7188932ca65f714f85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70408f1d3e7ea0877c40aa9b11bd46d715a4067c7ac95a7188932ca65f714f85", kill_on_drop: false }`
[INFO] [stdout] 70408f1d3e7ea0877c40aa9b11bd46d715a4067c7ac95a7188932ca65f714f85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fff91e8cf1571ef9b6dbfd77823ee03078eac22634ca7a7084912dfb06bc7ba5
[INFO] running `Command { std: "docker" "start" "-a" "fff91e8cf1571ef9b6dbfd77823ee03078eac22634ca7a7084912dfb06bc7ba5", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling serde_json v1.0.67
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking log v0.4.14
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking env_logger v0.9.0
[INFO] [stderr]    Compiling test-env-log v0.2.7
[INFO] [stderr]     Checking btree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `NodeUnderflow`
[INFO] [stdout]   --> src/main.rs:82:5
[INFO] [stdout]    |
[INFO] [stdout] 82 |     NodeUnderflow(V),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `KV`
[INFO] [stdout]   --> src/main.rs:89:6
[INFO] [stdout]    |
[INFO] [stdout] 89 | enum KV<K, V> {
[INFO] [stdout]    |      ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_key`
[INFO] [stdout]    --> src/main.rs:113:8
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn remove_key(&mut self, key: &K) -> Result<V, BtreeError<K, V>> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `num_keys`
[INFO] [stdout]    --> src/main.rs:127:8
[INFO] [stdout]     |
[INFO] [stdout] 127 |     fn num_keys(&self) -> usize {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_max`
[INFO] [stdout]    --> src/main.rs:134:8
[INFO] [stdout]     |
[INFO] [stdout] 134 |     fn remove_max(&mut self) -> KV<K, V> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_min`
[INFO] [stdout]    --> src/main.rs:147:8
[INFO] [stdout]     |
[INFO] [stdout] 147 |     fn remove_min(&mut self) -> KV<K, V> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_min`
[INFO] [stdout]    --> src/main.rs:171:8
[INFO] [stdout]     |
[INFO] [stdout] 171 |     fn remove_min(&mut self) -> (K, V) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_max`
[INFO] [stdout]    --> src/main.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 174 |     fn remove_max(&mut self) -> (K, V) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_key`
[INFO] [stdout]    --> src/main.rs:221:8
[INFO] [stdout]     |
[INFO] [stdout] 221 |     fn remove_key(&mut self, key: &K) -> Result<V, BtreeError<K, V>> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `num_keys`
[INFO] [stdout]    --> src/main.rs:236:8
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn num_keys(&self) -> usize {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_min`
[INFO] [stdout]    --> src/main.rs:267:8
[INFO] [stdout]     |
[INFO] [stdout] 267 |     fn remove_min(&mut self) -> (K, Node<K, V>) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_max`
[INFO] [stdout]    --> src/main.rs:270:8
[INFO] [stdout]     |
[INFO] [stdout] 270 |     fn remove_max(&mut self) -> (K, Node<K, V>) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `num_keys`
[INFO] [stdout]    --> src/main.rs:273:8
[INFO] [stdout]     |
[INFO] [stdout] 273 |     fn num_keys(&self) -> usize {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `leaf_borrow_from_left`
[INFO] [stdout]    --> src/main.rs:343:8
[INFO] [stdout]     |
[INFO] [stdout] 343 |     fn leaf_borrow_from_left(&mut self, left: usize, key: usize, right: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `leaf_merge`
[INFO] [stdout]    --> src/main.rs:359:8
[INFO] [stdout]     |
[INFO] [stdout] 359 |     fn leaf_merge(&mut self, left: usize, key: usize, right: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `leaf_borrow_from_right`
[INFO] [stdout]    --> src/main.rs:375:8
[INFO] [stdout]     |
[INFO] [stdout] 375 |     fn leaf_borrow_from_right(&mut self, left: usize, key: usize, right: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `handle_leaf_undeflow`
[INFO] [stdout]    --> src/main.rs:386:8
[INFO] [stdout]     |
[INFO] [stdout] 386 |     fn handle_leaf_undeflow(&mut self, index: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `branch_borrow_from_left`
[INFO] [stdout]    --> src/main.rs:410:8
[INFO] [stdout]     |
[INFO] [stdout] 410 |     fn branch_borrow_from_left(&mut self, left: usize, key: usize, right: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `branch_merge`
[INFO] [stdout]    --> src/main.rs:435:8
[INFO] [stdout]     |
[INFO] [stdout] 435 |     fn branch_merge(&mut self, left: usize, key: usize, right: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `branch_borrow_from_right`
[INFO] [stdout]    --> src/main.rs:451:8
[INFO] [stdout]     |
[INFO] [stdout] 451 |     fn branch_borrow_from_right(&mut self, left: usize, key: usize, right: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `handle_branch_underflow`
[INFO] [stdout]    --> src/main.rs:472:8
[INFO] [stdout]     |
[INFO] [stdout] 472 |     fn handle_branch_underflow(&mut self, index: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `handle_underflow`
[INFO] [stdout]    --> src/main.rs:491:8
[INFO] [stdout]     |
[INFO] [stdout] 491 |     fn handle_underflow(&mut self, index: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_key`
[INFO] [stdout]    --> src/main.rs:498:8
[INFO] [stdout]     |
[INFO] [stdout] 498 |     fn remove_key(&mut self, key: &K) -> Result<V, BtreeError<K, V>> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 23 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `KV`
[INFO] [stdout]   --> src/main.rs:89:6
[INFO] [stdout]    |
[INFO] [stdout] 89 | enum KV<K, V> {
[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: `remove_max`
[INFO] [stdout]    --> src/main.rs:134:8
[INFO] [stdout]     |
[INFO] [stdout] 134 |     fn remove_max(&mut self) -> KV<K, V> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_min`
[INFO] [stdout]    --> src/main.rs:147:8
[INFO] [stdout]     |
[INFO] [stdout] 147 |     fn remove_min(&mut self) -> KV<K, V> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.66s
[INFO] running `Command { std: "docker" "inspect" "fff91e8cf1571ef9b6dbfd77823ee03078eac22634ca7a7084912dfb06bc7ba5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fff91e8cf1571ef9b6dbfd77823ee03078eac22634ca7a7084912dfb06bc7ba5", kill_on_drop: false }`
[INFO] [stdout] fff91e8cf1571ef9b6dbfd77823ee03078eac22634ca7a7084912dfb06bc7ba5