[INFO] cloning repository https://github.com/care0717/lsm_engine
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/care0717/lsm_engine" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcare0717%2Flsm_engine", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcare0717%2Flsm_engine'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e28b201dee6771d91ed904442b8f69fbba7bdc03
[INFO] checking care0717/lsm_engine against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcare0717%2Flsm_engine" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/care0717/lsm_engine on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/care0717/lsm_engine
[INFO] finished tweaking git repo https://github.com/care0717/lsm_engine
[INFO] tweaked toml for git repo https://github.com/care0717/lsm_engine written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/care0717/lsm_engine already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "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] 6817f818fe3d2b98f9cdc5351cc58927b6a120e52f958264df6616fa0e465ed3
[INFO] running `Command { std: "docker" "start" "-a" "6817f818fe3d2b98f9cdc5351cc58927b6a120e52f958264df6616fa0e465ed3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6817f818fe3d2b98f9cdc5351cc58927b6a120e52f958264df6616fa0e465ed3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6817f818fe3d2b98f9cdc5351cc58927b6a120e52f958264df6616fa0e465ed3", kill_on_drop: false }`
[INFO] [stdout] 6817f818fe3d2b98f9cdc5351cc58927b6a120e52f958264df6616fa0e465ed3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--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] 1f6812a1b1e3b75062ac90ed30d156f50006c1728626c2b5e015f230a0f898b5
[INFO] running `Command { std: "docker" "start" "-a" "1f6812a1b1e3b75062ac90ed30d156f50006c1728626c2b5e015f230a0f898b5", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking env_logger v0.8.4
[INFO] [stderr]     Checking lsm_engine v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::memtable::Memtable`
[INFO] [stdout]    --> src/avl.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     use crate::memtable::Memtable;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `delete`
[INFO] [stdout]   --> src/avl/tree.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 51 |     pub fn delete(mut self, key: &K) -> AvlTree<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: `delete_root`
[INFO] [stdout]   --> src/avl/tree.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 |     fn delete_root(self) -> AvlTree<K, V> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `combine`
[INFO] [stdout]   --> src/avl/tree.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 |     fn combine(self, left: Box<AvlNode<K, V>>) -> AvlNode<K, V> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `delete_max`
[INFO] [stdout]   --> src/avl/tree.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 87 |     fn delete_max(mut self) -> (AvlTree<K, V>, K, V) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print`
[INFO] [stdout]    --> src/avl/tree.rs:156:8
[INFO] [stdout]     |
[INFO] [stdout] 156 |     fn print(&self) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print_tree`
[INFO] [stdout]    --> src/avl/tree.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 |     fn print_tree(&self, depth: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `delete`
[INFO] [stdout]   --> src/avl.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn delete(&mut self, key: &K) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print`
[INFO] [stdout]    --> src/avl/tree.rs:156:8
[INFO] [stdout]     |
[INFO] [stdout] 156 |     fn print(&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: `print_tree`
[INFO] [stdout]    --> src/avl/tree.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 |     fn print_tree(&self, depth: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `search`
[INFO] [stdout]    --> src/avl/tree.rs:370:8
[INFO] [stdout]     |
[INFO] [stdout] 370 |     fn search() {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `delete`
[INFO] [stdout]   --> src/avl.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn delete(&mut self, key: &K) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.00s
[INFO] running `Command { std: "docker" "inspect" "1f6812a1b1e3b75062ac90ed30d156f50006c1728626c2b5e015f230a0f898b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f6812a1b1e3b75062ac90ed30d156f50006c1728626c2b5e015f230a0f898b5", kill_on_drop: false }`
[INFO] [stdout] 1f6812a1b1e3b75062ac90ed30d156f50006c1728626c2b5e015f230a0f898b5