[INFO] fetching crate lsm_engine 0.1.9...
[INFO] checking lsm_engine-0.1.9 against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] extracting crate lsm_engine 0.1.9 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate lsm_engine 0.1.9 on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "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-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "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] 0ba4dc0a30d2851b69d4d8238ab7e7483558c6a58069994fb3c7065e6fb1c3b6
[INFO] running `Command { std: "docker" "start" "-a" "0ba4dc0a30d2851b69d4d8238ab7e7483558c6a58069994fb3c7065e6fb1c3b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ba4dc0a30d2851b69d4d8238ab7e7483558c6a58069994fb3c7065e6fb1c3b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ba4dc0a30d2851b69d4d8238ab7e7483558c6a58069994fb3c7065e6fb1c3b6", kill_on_drop: false }`
[INFO] [stdout] 0ba4dc0a30d2851b69d4d8238ab7e7483558c6a58069994fb3c7065e6fb1c3b6
[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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1b33ec1c3aa520cadb77e340d39d146c73a06307c3472ba0f77e0e949ca3dd71
[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" "1b33ec1c3aa520cadb77e340d39d146c73a06307c3472ba0f77e0e949ca3dd71", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.56
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling serde_json v1.0.61
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking compare v0.1.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking binary-heap-plus v0.2.0
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.23
[INFO] [stderr]     Checking thiserror v1.0.23
[INFO] [stderr]     Checking lsm_engine v0.1.9 (/opt/rustwide/workdir)
[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: 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 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 dev [unoptimized + debuginfo] target(s) in 39.09s
[INFO] running `Command { std: "docker" "inspect" "1b33ec1c3aa520cadb77e340d39d146c73a06307c3472ba0f77e0e949ca3dd71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b33ec1c3aa520cadb77e340d39d146c73a06307c3472ba0f77e0e949ca3dd71", kill_on_drop: false }`
[INFO] [stdout] 1b33ec1c3aa520cadb77e340d39d146c73a06307c3472ba0f77e0e949ca3dd71