[INFO] fetching crate lsm_engine 0.1.9...
[INFO] testing lsm_engine-0.1.9 against 1.47.0 for beta-1.48-1
[INFO] extracting crate lsm_engine 0.1.9 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate lsm_engine 0.1.9 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lsm_engine 0.1.9
[INFO] finished tweaking crates.io crate lsm_engine 0.1.9
[INFO] tweaked toml for crates.io crate lsm_engine 0.1.9 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5fa31a4d701c525f6d93b3b4cd91c8f4186fe7dcbad7b4d7b9936fd8e69bef76
[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" "5fa31a4d701c525f6d93b3b4cd91c8f4186fe7dcbad7b4d7b9936fd8e69bef76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5fa31a4d701c525f6d93b3b4cd91c8f4186fe7dcbad7b4d7b9936fd8e69bef76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5fa31a4d701c525f6d93b3b4cd91c8f4186fe7dcbad7b4d7b9936fd8e69bef76", kill_on_drop: false }`
[INFO] [stdout] 5fa31a4d701c525f6d93b3b4cd91c8f4186fe7dcbad7b4d7b9936fd8e69bef76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7857839a16e4a62e5a363d66213085bb62ece489f952a653317bbc0c7b02fd42
[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" "7857839a16e4a62e5a363d66213085bb62ece489f952a653317bbc0c7b02fd42", kill_on_drop: false }`
[INFO] [stderr]    Compiling compare v0.1.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.21
[INFO] [stderr]    Compiling binary-heap-plus v0.2.0
[INFO] [stderr]    Compiling thiserror v1.0.21
[INFO] [stderr]    Compiling lsm_engine v0.1.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `closest_key`
[INFO] [stdout]    --> src/lib.rs:272:14
[INFO] [stdout]     |
[INFO] [stdout] 272 |         let (closest_key, (key_offset, segment_index)) = maybe_closest_key.unwrap();
[INFO] [stdout]     |              ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closest_key`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/sst.rs:75:27
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
[INFO] [stdout]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `clear`
[INFO] [stdout]   --> src/memtable.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn clear(&mut 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: `new`
[INFO] [stdout]    --> src/sst.rs:189:12
[INFO] [stdout]     |
[INFO] [stdout] 189 |     pub fn new(path: &str) -> Segment {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `timestamp`
[INFO] [stdout]    --> src/sst.rs:208:12
[INFO] [stdout]     |
[INFO] [stdout] 208 |     pub fn timestamp(&self) -> Instant {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `at`
[INFO] [stdout]    --> src/sst.rs:248:12
[INFO] [stdout]     |
[INFO] [stdout] 248 |     pub fn at(&mut self, pos: u64) -> Result<Option<String>> {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]   --> src/sst.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[macro_use]
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]  --> src/kv.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.12s
[INFO] running `Command { std: "docker" "inspect" "7857839a16e4a62e5a363d66213085bb62ece489f952a653317bbc0c7b02fd42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7857839a16e4a62e5a363d66213085bb62ece489f952a653317bbc0c7b02fd42", kill_on_drop: false }`
[INFO] [stdout] 7857839a16e4a62e5a363d66213085bb62ece489f952a653317bbc0c7b02fd42
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 90433dc50d6ecba4c46d3856c50dc064fd4cb40c6cc6731a0570f6c4e6b857d4
[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" "90433dc50d6ecba4c46d3856c50dc064fd4cb40c6cc6731a0570f6c4e6b857d4", kill_on_drop: false }`
[INFO] [stderr]    Compiling lsm_engine v0.1.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `closest_key`
[INFO] [stdout]    --> src/lib.rs:272:14
[INFO] [stdout]     |
[INFO] [stdout] 272 |         let (closest_key, (key_offset, segment_index)) = maybe_closest_key.unwrap();
[INFO] [stdout]     |              ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closest_key`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/sst.rs:75:27
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
[INFO] [stdout]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `clear`
[INFO] [stdout]   --> src/memtable.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn clear(&mut 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: `new`
[INFO] [stdout]    --> src/sst.rs:189:12
[INFO] [stdout]     |
[INFO] [stdout] 189 |     pub fn new(path: &str) -> Segment {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `timestamp`
[INFO] [stdout]    --> src/sst.rs:208:12
[INFO] [stdout]     |
[INFO] [stdout] 208 |     pub fn timestamp(&self) -> Instant {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `at`
[INFO] [stdout]    --> src/sst.rs:248:12
[INFO] [stdout]     |
[INFO] [stdout] 248 |     pub fn at(&mut self, pos: u64) -> Result<Option<String>> {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]   --> src/sst.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[macro_use]
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]  --> src/kv.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TOMBSTONE_VALUE`
[INFO] [stdout]    --> src/lib.rs:312:17
[INFO] [stdout]     |
[INFO] [stdout] 312 |     use crate::{TOMBSTONE_VALUE};
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `closest_key`
[INFO] [stdout]    --> src/lib.rs:272:14
[INFO] [stdout]     |
[INFO] [stdout] 272 |         let (closest_key, (key_offset, segment_index)) = maybe_closest_key.unwrap();
[INFO] [stdout]     |              ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closest_key`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/sst.rs:75:27
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
[INFO] [stdout]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `offset_1`
[INFO] [stdout]    --> src/sst.rs:361:13
[INFO] [stdout]     |
[INFO] [stdout] 361 |         let offset_1 = sst.write(KVPair { key: "k1".to_owned(), value: "v1".to_owned() })?;
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset_1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]    --> src/sst.rs:387:40
[INFO] [stdout]     |
[INFO] [stdout] 387 |         let mut merged = merge(v, 20, |index, offset, _| {})?;
[INFO] [stdout]     |                                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `offset`
[INFO] [stdout]    --> src/sst.rs:387:47
[INFO] [stdout]     |
[INFO] [stdout] 387 |         let mut merged = merge(v, 20, |index, offset, _| {})?;
[INFO] [stdout]     |                                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]    --> src/sst.rs:414:41
[INFO] [stdout]     |
[INFO] [stdout] 414 |         let mut merged = merge(v, 100, |index, offset, _| {})?;
[INFO] [stdout]     |                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `offset`
[INFO] [stdout]    --> src/sst.rs:414:48
[INFO] [stdout]     |
[INFO] [stdout] 414 |         let mut merged = merge(v, 100, |index, offset, _| {})?;
[INFO] [stdout]     |                                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `random_value`
[INFO] [stdout]    --> src/lib.rs:387:30
[INFO] [stdout]     |
[INFO] [stdout] 387 |             let (random_key, random_value) = dataset.choose(&mut rng).unwrap();
[INFO] [stdout]     |                              ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_random_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/lib.rs:410:21
[INFO] [stdout]     |
[INFO] [stdout] 410 |             let (k, v) = &dataset[i];
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/lib.rs:422:21
[INFO] [stdout]     |
[INFO] [stdout] 422 |             let (k, v) = &dataset[i];
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `clear`
[INFO] [stdout]   --> src/memtable.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn clear(&mut 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: `new`
[INFO] [stdout]    --> src/sst.rs:189:12
[INFO] [stdout]     |
[INFO] [stdout] 189 |     pub fn new(path: &str) -> Segment {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `timestamp`
[INFO] [stdout]    --> src/sst.rs:208:12
[INFO] [stdout]     |
[INFO] [stdout] 208 |     pub fn timestamp(&self) -> Instant {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]   --> src/sst.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[macro_use]
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]  --> src/kv.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.55s
[INFO] running `Command { std: "docker" "inspect" "90433dc50d6ecba4c46d3856c50dc064fd4cb40c6cc6731a0570f6c4e6b857d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90433dc50d6ecba4c46d3856c50dc064fd4cb40c6cc6731a0570f6c4e6b857d4", kill_on_drop: false }`
[INFO] [stdout] 90433dc50d6ecba4c46d3856c50dc064fd4cb40c6cc6731a0570f6c4e6b857d4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 63c5c7166eb2c8954c84f96805c355f59dd8240bf103617f8375f0b33e30c3f0
[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" "63c5c7166eb2c8954c84f96805c355f59dd8240bf103617f8375f0b33e30c3f0", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `closest_key`
[INFO] [stderr]    --> src/lib.rs:272:14
[INFO] [stderr]     |
[INFO] [stderr] 272 |         let (closest_key, (key_offset, segment_index)) = maybe_closest_key.unwrap();
[INFO] [stderr]     |              ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closest_key`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/sst.rs:75:27
[INFO] [stderr]    |
[INFO] [stderr] 75 |     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
[INFO] [stderr]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `clear`
[INFO] [stderr]   --> src/memtable.rs:34:12
[INFO] [stderr]    |
[INFO] [stderr] 34 |     pub fn clear(&mut self) {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/sst.rs:189:12
[INFO] [stderr]     |
[INFO] [stderr] 189 |     pub fn new(path: &str) -> Segment {
[INFO] [stderr]     |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `timestamp`
[INFO] [stderr]    --> src/sst.rs:208:12
[INFO] [stderr]     |
[INFO] [stderr] 208 |     pub fn timestamp(&self) -> Instant {
[INFO] [stderr]     |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `at`
[INFO] [stderr]    --> src/sst.rs:248:12
[INFO] [stderr]     |
[INFO] [stderr] 248 |     pub fn at(&mut self, pos: u64) -> Result<Option<String>> {
[INFO] [stderr]     |            ^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]   --> src/sst.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | #[macro_use]
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]  --> src/kv.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TOMBSTONE_VALUE`
[INFO] [stderr]    --> src/lib.rs:312:17
[INFO] [stderr]     |
[INFO] [stderr] 312 |     use crate::{TOMBSTONE_VALUE};
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `closest_key`
[INFO] [stderr]    --> src/lib.rs:272:14
[INFO] [stderr]     |
[INFO] [stderr] 272 |         let (closest_key, (key_offset, segment_index)) = maybe_closest_key.unwrap();
[INFO] [stderr]     |              ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closest_key`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/sst.rs:75:27
[INFO] [stderr]    |
[INFO] [stderr] 75 |     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
[INFO] [stderr]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `offset_1`
[INFO] [stderr]    --> src/sst.rs:361:13
[INFO] [stderr]     |
[INFO] [stderr] 361 |         let offset_1 = sst.write(KVPair { key: "k1".to_owned(), value: "v1".to_owned() })?;
[INFO] [stderr]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset_1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]    --> src/sst.rs:387:40
[INFO] [stderr]     |
[INFO] [stderr] 387 |         let mut merged = merge(v, 20, |index, offset, _| {})?;
[INFO] [stderr]     |                                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `offset`
[INFO] [stderr]    --> src/sst.rs:387:47
[INFO] [stderr]     |
[INFO] [stderr] 387 |         let mut merged = merge(v, 20, |index, offset, _| {})?;
[INFO] [stderr]     |                                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]    --> src/sst.rs:414:41
[INFO] [stderr]     |
[INFO] [stderr] 414 |         let mut merged = merge(v, 100, |index, offset, _| {})?;
[INFO] [stderr]     |                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `offset`
[INFO] [stderr]    --> src/sst.rs:414:48
[INFO] [stderr]     |
[INFO] [stderr] 414 |         let mut merged = merge(v, 100, |index, offset, _| {})?;
[INFO] [stderr]     |                                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `random_value`
[INFO] [stderr]    --> src/lib.rs:387:30
[INFO] [stderr]     |
[INFO] [stderr] 387 |             let (random_key, random_value) = dataset.choose(&mut rng).unwrap();
[INFO] [stderr]     |                              ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_random_value`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]    --> src/lib.rs:410:21
[INFO] [stderr]     |
[INFO] [stderr] 410 |             let (k, v) = &dataset[i];
[INFO] [stderr]     |                     ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]    --> src/lib.rs:422:21
[INFO] [stderr]     |
[INFO] [stderr] 422 |             let (k, v) = &dataset[i];
[INFO] [stderr]     |                     ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `clear`
[INFO] [stderr]   --> src/memtable.rs:34:12
[INFO] [stderr]    |
[INFO] [stderr] 34 |     pub fn clear(&mut self) {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/sst.rs:189:12
[INFO] [stderr]     |
[INFO] [stderr] 189 |     pub fn new(path: &str) -> Segment {
[INFO] [stderr]     |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `timestamp`
[INFO] [stderr]    --> src/sst.rs:208:12
[INFO] [stderr]     |
[INFO] [stderr] 208 |     pub fn timestamp(&self) -> Instant {
[INFO] [stderr]     |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]   --> src/sst.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | #[macro_use]
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]  --> src/kv.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 16 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/lsm_engine-a1dd4b794c3c46a2
[INFO] [stdout] 
[INFO] [stdout] running 15 tests
[INFO] [stdout] test memtable::tests::it_works ... ok
[INFO] [stdout] test sst::tests::test_unsorted_writes ... ok
[INFO] [stdout] test sst::tests::test_search ... ok
[INFO] [stdout] test sst::tests::test_merge_with_same_keys_different_timestamps ... ok
[INFO] [stdout] test sst::tests::test_search_range ... ok
[INFO] [stdout] test sst::tests::test_merges ... ok
[INFO] [stdout] test sst::tests::test_interspersed_seek_and_search ... ok
[INFO] [stdout] test sst::tests::test_read ... ok
[INFO] [stdout] test sst::tests::test_seek ... ok
[INFO] [stdout] test tests::test_reads_on_duplicate_keys ... ok
[INFO] [stdout] test tests::test_deletions ... ok
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] test tests::test_contains ... ok
[INFO] [stdout] test tests::test_recovery_with_wal ... FAILED
[INFO] [stdout] test tests::test_on_large_dataset ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- tests::test_recovery_with_wal stdout ----
[INFO] [stdout] thread 'tests::test_recovery_with_wal' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: Other, message: "Read-only file system" }', src/lib.rs:166:14
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x5569c8098900 - std::backtrace_rs::backtrace::libunwind::trace::h577ea05e9ca4629a
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96
[INFO] [stdout]    1:     0x5569c8098900 - std::backtrace_rs::backtrace::trace_unsynchronized::h50b9b72b84c7dd56
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/../../backtrace/src/backtrace/mod.rs:66
[INFO] [stdout]    2:     0x5569c8098900 - std::sys_common::backtrace::_print_fmt::h6541cf9823837fac
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:79
[INFO] [stdout]    3:     0x5569c8098900 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hf64fbff071026df5
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:58
[INFO] [stdout]    4:     0x5569c80bbd6c - core::fmt::write::h9ddafa4860d8adff
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/fmt/mod.rs:1082
[INFO] [stdout]    5:     0x5569c7fea8d5 - std::io::Write::write_fmt::h50a71e2460ce07da
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/io/mod.rs:1514
[INFO] [stdout]    6:     0x5569c80935b1 - std::io::impls::<impl std::io::Write for alloc::boxed::Box<W>>::write_fmt::h9bbd3fed8160d0d2
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/io/impls.rs:176
[INFO] [stdout]    7:     0x5569c809ae50 - std::sys_common::backtrace::_print::ha25f9ff5080d886d
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:61
[INFO] [stdout]    8:     0x5569c809ae50 - std::sys_common::backtrace::print::h213e8aa8dc5405c0
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:48
[INFO] [stdout]    9:     0x5569c809ae50 - std::panicking::default_hook::{{closure}}::h6482fae49ef9d963
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:200
[INFO] [stdout]   10:     0x5569c809ab46 - std::panicking::default_hook::he30ad7589e0970f9
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:216
[INFO] [stdout]   11:     0x5569c809b4b3 - std::panicking::rust_panic_with_hook::haa1ed36ada4ffb03
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:569
[INFO] [stdout]   12:     0x5569c809b089 - std::panicking::begin_panic_handler::{{closure}}::h7001af1bb21aeaeb
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:476
[INFO] [stdout]   13:     0x5569c8098d8c - std::sys_common::backtrace::__rust_end_short_backtrace::h39910f557f5f2367
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:153
[INFO] [stdout]   14:     0x5569c809b049 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:475
[INFO] [stdout]   15:     0x5569c80ba621 - core::panicking::panic_fmt::h4e2659771ebc78eb
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/panicking.rs:85
[INFO] [stdout]   16:     0x5569c80ba443 - core::option::expect_none_failed::h448b58a024c2c33a
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/option.rs:1221
[INFO] [stdout]   17:     0x5569c7fd23eb - core::result::Result<T,E>::unwrap::h2f06d8d49ed2eda0
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/result.rs:973
[INFO] [stdout]   18:     0x5569c7fd3b1b - lsm_engine::LSMBuilder::wal_path::hbfda38f5126a2895
[INFO] [stdout]                                at /opt/rustwide/workdir/src/lib.rs:161
[INFO] [stdout]   19:     0x5569c7f9eb09 - lsm_engine::tests::test_recovery_with_wal::he964e9cebc2fc49d
[INFO] [stdout]                                at /opt/rustwide/workdir/src/lib.rs:401
[INFO] [stdout]   20:     0x5569c7f9ea8e - lsm_engine::tests::test_recovery_with_wal::{{closure}}::hbdcd943bd944c358
[INFO] [stdout]                                at /opt/rustwide/workdir/src/lib.rs:400
[INFO] [stdout]   21:     0x5569c7fc4f2e - core::ops::function::FnOnce::call_once::h3880fc8ebe6df7b2
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/ops/function.rs:227
[INFO] [stdout]   22:     0x5569c80131b3 - core::ops::function::FnOnce::call_once::hd04d57b5cf16f85a
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/ops/function.rs:227
[INFO] [stdout]   23:     0x5569c80131b3 - test::__rust_begin_short_backtrace::hd8e9a8c5a2e43388
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/test/src/lib.rs:517
[INFO] [stdout]   24:     0x5569c8011683 - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h3c3db8a500c1a19a
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/alloc/src/boxed.rs:1042
[INFO] [stdout]   25:     0x5569c8011683 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h043e9ebcbe360c80
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panic.rs:308
[INFO] [stdout]   26:     0x5569c8011683 - std::panicking::try::do_call::h47c2fb275506c2e8
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:373
[INFO] [stdout]   27:     0x5569c8011683 - std::panicking::try::h569c20f0e99453b4
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:337
[INFO] [stdout]   28:     0x5569c8011683 - std::panic::catch_unwind::hb33c6d0f01540d23
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panic.rs:379
[INFO] [stdout]   29:     0x5569c8011683 - test::run_test_in_process::hc0ce562d167e51cf
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/test/src/lib.rs:544
[INFO] [stdout]   30:     0x5569c8011683 - test::run_test::run_test_inner::{{closure}}::hd3120982fcd71544
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/test/src/lib.rs:450
[INFO] [stdout]   31:     0x5569c7fe9d06 - std::sys_common::backtrace::__rust_begin_short_backtrace::h84f8bc12cc4cdac6
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:137
[INFO] [stdout]   32:     0x5569c7feef35 - std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}::hb8b5fa0ba425d4db
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/thread/mod.rs:458
[INFO] [stdout]   33:     0x5569c7feef35 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hc4b84b244cf55f75
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panic.rs:308
[INFO] [stdout]   34:     0x5569c7feef35 - std::panicking::try::do_call::ha31922ad8fa17753
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:373
[INFO] [stdout]   35:     0x5569c7feef35 - std::panicking::try::h38a6da203722ae6e
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:337
[INFO] [stdout]   36:     0x5569c7feef35 - std::panic::catch_unwind::h83afce167c9062b9
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panic.rs:379
[INFO] [stdout]   37:     0x5569c7feef35 - std::thread::Builder::spawn_unchecked::{{closure}}::h160689155590a70c
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/thread/mod.rs:457
[INFO] [stdout]   38:     0x5569c7feef35 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h7dbf17a455132a46
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/ops/function.rs:227
[INFO] [stdout]   39:     0x5569c80a1e3a - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h670c50864ac2cb92
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/alloc/src/boxed.rs:1042
[INFO] [stdout]   40:     0x5569c80a1e3a - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h2511952749086d81
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/alloc/src/boxed.rs:1042
[INFO] [stdout]   41:     0x5569c80a1e3a - std::sys::unix::thread::Thread::new::thread_start::h5ad4ddffe24373a8
[INFO] [stdout]                                at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys/unix/thread.rs:87
[INFO] [stdout]   42:     0x7f0ca93d0609 - start_thread
[INFO] [stdout]   43:     0x7f0ca92dc103 - clone
[INFO] [stdout]   44:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     tests::test_recovery_with_wal
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 14 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--lib'
[INFO] running `Command { std: "docker" "inspect" "63c5c7166eb2c8954c84f96805c355f59dd8240bf103617f8375f0b33e30c3f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63c5c7166eb2c8954c84f96805c355f59dd8240bf103617f8375f0b33e30c3f0", kill_on_drop: false }`
[INFO] [stdout] 63c5c7166eb2c8954c84f96805c355f59dd8240bf103617f8375f0b33e30c3f0
