[INFO] cloning repository https://github.com/tommyjk/kv-server
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tommyjk/kv-server" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftommyjk%2Fkv-server", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftommyjk%2Fkv-server'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1e9d4fd41746072b4fc42ef4c9601347447dda56
[INFO] testing tommyjk/kv-server against beta-2020-10-09 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftommyjk%2Fkv-server" "/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/tommyjk/kv-server on toolchain beta-2020-10-09
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tommyjk/kv-server
[INFO] finished tweaking git repo https://github.com/tommyjk/kv-server
[INFO] tweaked toml for git repo https://github.com/tommyjk/kv-server written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/tommyjk/kv-server already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `http://github.com/crossbeam-rs/crossbeam.git`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded criterion-plot v0.4.0
[INFO] [stderr]   Downloaded rand_xoshiro v0.3.1
[INFO] [stderr]   Downloaded historian v4.0.3
[INFO] [stderr]   Downloaded rand_os v0.2.2
[INFO] [stderr]   Downloaded sled v0.27.0
[INFO] [stderr]   Downloaded blake2b_simd v0.5.7
[INFO] [stderr]   Downloaded criterion v0.3.0
[INFO] [stderr]   Downloaded panic-control v0.1.4
[INFO] [stderr]   Downloaded pagecache v0.19.2
[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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0ef39a0ecbe7165fbb2387a74deb41b8d288b383ee0691dd404760077bf05bad
[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" "0ef39a0ecbe7165fbb2387a74deb41b8d288b383ee0691dd404760077bf05bad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ef39a0ecbe7165fbb2387a74deb41b8d288b383ee0691dd404760077bf05bad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ef39a0ecbe7165fbb2387a74deb41b8d288b383ee0691dd404760077bf05bad", kill_on_drop: false }`
[INFO] [stdout] 0ef39a0ecbe7165fbb2387a74deb41b8d288b383ee0691dd404760077bf05bad
[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=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" "+beta-2020-10-09" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c0e5f08d146d1be3bb9b429ed66dac47b651cec25e701851602b6d26b2889bf4
[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" "c0e5f08d146d1be3bb9b429ed66dac47b651cec25e701851602b6d26b2889bf4", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling spin v0.5.0
[INFO] [stderr]    Compiling scopeguard v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling proc-macro2 v1.0.2
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling rayon-core v1.7.0
[INFO] [stderr]    Compiling unicode-segmentation v1.3.0
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling historian v4.0.3
[INFO] [stderr]    Compiling pin-project-lite v0.1.1
[INFO] [stderr]    Compiling take_mut v0.2.2
[INFO] [stderr]    Compiling futures-io v0.3.1
[INFO] [stderr]    Compiling futures-core v0.3.1
[INFO] [stderr]    Compiling once_cell v1.2.0
[INFO] [stderr]    Compiling futures-timer v2.0.2
[INFO] [stderr]    Compiling bytes v0.5.3
[INFO] [stderr]    Compiling crossbeam-utils v0.7.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling bincode v1.1.4
[INFO] [stderr]    Compiling lock_api v0.3.1
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6 (http://github.com/crossbeam-rs/crossbeam.git?rev=31fc7e6#31fc7e62)
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling kv-log-macro v1.0.4
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling slog-async v2.3.0
[INFO] [stderr]    Compiling crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling async-task v1.0.0
[INFO] [stderr]    Compiling num_cpus v1.11.1
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling atty v0.2.12
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling crossbeam-queue v0.2.0
[INFO] [stderr]    Compiling crossbeam-channel v0.4.0
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling mio v0.6.21
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2 (http://github.com/crossbeam-rs/crossbeam.git?rev=31fc7e6#31fc7e62)
[INFO] [stderr]    Compiling crossbeam-deque v0.7.2
[INFO] [stderr]    Compiling crossbeam-skiplist v0.0.0 (http://github.com/crossbeam-rs/crossbeam.git?rev=31fc7e6#31fc7e62)
[INFO] [stderr]    Compiling broadcaster v0.2.6
[INFO] [stderr]    Compiling chrono v0.4.8
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling rayon v1.3.0
[INFO] [stderr]    Compiling slog-term v2.4.1
[INFO] [stderr]    Compiling serde_derive v1.0.97
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]    Compiling async-trait v0.1.21
[INFO] [stderr]    Compiling structopt v0.2.18
[INFO] [stderr]    Compiling async-std v1.4.0
[INFO] [stderr]    Compiling serde_bytes v0.11.2
[INFO] [stderr]    Compiling pagecache v0.19.2
[INFO] [stderr]    Compiling sled v0.27.0
[INFO] [stderr]    Compiling kvs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `time::Instant`
[INFO] [stdout]   --> src/kvs/kvs.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     time::Instant,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `KvsError`
[INFO] [stdout]  --> src/protocol/stream.rs:9:18
[INFO] [stdout]   |
[INFO] [stdout] 9 | use crate::kvs::{KvsError, Result};
[INFO] [stdout]   |                  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/server.rs:64:92
[INFO] [stdout]    |
[INFO] [stdout] 64 |                 Err(e) => error!(self.log, "Error establishing connection"; "message" => e.description()),
[INFO] [stdout]    |                                                                                            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> src/protocol/client.rs:49:21
[INFO] [stdout]    |
[INFO] [stdout] 49 |                 let mut result = self.stream.read(&mut answer[..]).await?;
[INFO] [stdout]    |                     ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/protocol/client.rs:41:17
[INFO] [stdout]    |
[INFO] [stdout] 41 |             let mut result = self.stream.read(&mut answer[..]).await?;
[INFO] [stdout]    |                 ----^^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/protocol/client.rs:49:21
[INFO] [stdout]    |
[INFO] [stdout] 49 |                 let mut result = self.stream.read(&mut answer[..]).await?;
[INFO] [stdout]    |                     ----^^^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/kvs/kvs.rs:547:9
[INFO] [stdout]     |
[INFO] [stdout] 547 |         bufwriter.write_all(&self.min_fileid.load(Ordering::Relaxed).to_le_bytes()).await;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/server.rs:88:17
[INFO] [stdout]    |
[INFO] [stdout] 88 | /                 conn.send(response).await.map_err(|e| {
[INFO] [stdout] 89 | |                     error!(log, "Something went wrong in response to client {:?}", e);
[INFO] [stdout] 90 | |                 });
[INFO] [stdout]    | |___________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bin/kvs-server.rs:143:5
[INFO] [stdout]     |
[INFO] [stdout] 143 | /     task::block_on(async {
[INFO] [stdout] 144 | |         check_your_engines(&db_path, &engine).await.map_err(|e| {
[INFO] [stdout] 145 | |             error!(log, "Check engine failed: {}", e);
[INFO] [stdout] 146 | |             panic!()
[INFO] [stdout] 147 | |         })
[INFO] [stdout] 148 | |     });
[INFO] [stdout]     | |_______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2m 24s
[INFO] running `Command { std: "docker" "inspect" "c0e5f08d146d1be3bb9b429ed66dac47b651cec25e701851602b6d26b2889bf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0e5f08d146d1be3bb9b429ed66dac47b651cec25e701851602b6d26b2889bf4", kill_on_drop: false }`
[INFO] [stdout] c0e5f08d146d1be3bb9b429ed66dac47b651cec25e701851602b6d26b2889bf4
[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=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" "+beta-2020-10-09" "test" "--frozen" "--no-run" "--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] 1faf63ed589aeb002dc206e84150c9c4bb235205c976c3e02b32a1e015161c17
[INFO] running `Command { std: "docker" "start" "-a" "1faf63ed589aeb002dc206e84150c9c4bb235205c976c3e02b32a1e015161c17", kill_on_drop: false }`
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]    Compiling regex v1.1.9
[INFO] [stderr]    Compiling ppv-lite86 v0.2.5
[INFO] [stderr]    Compiling escargot v0.4.0
[INFO] [stderr]    Compiling predicates-core v1.0.0
[INFO] [stderr]    Compiling normalize-line-endings v0.2.2
[INFO] [stderr]    Compiling difference v2.0.0
[INFO] [stderr]    Compiling cast v0.2.2
[INFO] [stderr]    Compiling treeline v0.1.0
[INFO] [stderr]    Compiling panic-control v0.1.4
[INFO] [stderr]    Compiling rand_chacha v0.2.0
[INFO] [stderr]    Compiling itertools v0.8.0
[INFO] [stderr]    Compiling regex-syntax v0.6.8
[INFO] [stderr]    Compiling getrandom v0.1.6
[INFO] [stderr]    Compiling regex-automata v0.1.8
[INFO] [stderr]    Compiling aho-corasick v0.7.4
[INFO] [stderr]    Compiling csv-core v0.1.6
[INFO] [stderr]    Compiling float-cmp v0.4.0
[INFO] [stderr]    Compiling predicates-tree v1.0.0
[INFO] [stderr]    Compiling rand_core v0.5.0
[INFO] [stdout] warning: unused import: `time::Instant`
[INFO] [stdout]   --> src/kvs/kvs.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     time::Instant,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `KvsError`
[INFO] [stdout]  --> src/protocol/stream.rs:9:18
[INFO] [stdout]   |
[INFO] [stdout] 9 | use crate::kvs::{KvsError, Result};
[INFO] [stdout]   |                  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/server.rs:64:92
[INFO] [stdout]    |
[INFO] [stdout] 64 |                 Err(e) => error!(self.log, "Error establishing connection"; "message" => e.description()),
[INFO] [stdout]    |                                                                                            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> src/protocol/client.rs:49:21
[INFO] [stdout]    |
[INFO] [stdout] 49 |                 let mut result = self.stream.read(&mut answer[..]).await?;
[INFO] [stdout]    |                     ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/protocol/client.rs:41:17
[INFO] [stdout]    |
[INFO] [stdout] 41 |             let mut result = self.stream.read(&mut answer[..]).await?;
[INFO] [stdout]    |                 ----^^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/protocol/client.rs:49:21
[INFO] [stdout]    |
[INFO] [stdout] 49 |                 let mut result = self.stream.read(&mut answer[..]).await?;
[INFO] [stdout]    |                     ----^^^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/kvs/kvs.rs:547:9
[INFO] [stdout]     |
[INFO] [stdout] 547 |         bufwriter.write_all(&self.min_fileid.load(Ordering::Relaxed).to_le_bytes()).await;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/server.rs:88:17
[INFO] [stdout]    |
[INFO] [stdout] 88 | /                 conn.send(response).await.map_err(|e| {
[INFO] [stdout] 89 | |                     error!(log, "Something went wrong in response to client {:?}", e);
[INFO] [stdout] 90 | |                 });
[INFO] [stdout]    | |___________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bin/kvs-server.rs:143:5
[INFO] [stdout]     |
[INFO] [stdout] 143 | /     task::block_on(async {
[INFO] [stdout] 144 | |         check_your_engines(&db_path, &engine).await.map_err(|e| {
[INFO] [stdout] 145 | |             error!(log, "Check engine failed: {}", e);
[INFO] [stdout] 146 | |             panic!()
[INFO] [stdout] 147 | |         })
[INFO] [stdout] 148 | |     });
[INFO] [stdout]     | |_______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling bstr v0.2.8
[INFO] [stderr]    Compiling rand_os v0.2.2
[INFO] [stderr]    Compiling rand_xoshiro v0.3.1
[INFO] [stderr]    Compiling serde_json v1.0.40
[INFO] [stderr]    Compiling c2-chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.0
[INFO] [stderr]    Compiling criterion-plot v0.4.0
[INFO] [stderr]    Compiling csv v1.1.1
[INFO] [stderr]    Compiling tinytemplate v1.0.2
[INFO] [stderr]    Compiling tempfile v3.1.0
[INFO] [stderr]    Compiling criterion v0.3.0
[INFO] [stderr]    Compiling predicates v1.0.1
[INFO] [stderr]    Compiling assert_cmd v0.11.1
[INFO] [stderr]    Compiling kvs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Mutex`
[INFO] [stdout]  --> tests/kv_store.rs:3:37
[INFO] [stdout]   |
[INFO] [stdout] 3 | use async_std::sync::{Arc, Barrier, Mutex};
[INFO] [stdout]   |                                     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> tests/kv_store.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 52.07s
[INFO] running `Command { std: "docker" "inspect" "1faf63ed589aeb002dc206e84150c9c4bb235205c976c3e02b32a1e015161c17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1faf63ed589aeb002dc206e84150c9c4bb235205c976c3e02b32a1e015161c17", kill_on_drop: false }`
[INFO] [stdout] 1faf63ed589aeb002dc206e84150c9c4bb235205c976c3e02b32a1e015161c17
[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=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" "+beta-2020-10-09" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9edd3a0130ad29129a55312dfa9b8b474449f958fa9e0524475a5d89ff1dde29
[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" "9edd3a0130ad29129a55312dfa9b8b474449f958fa9e0524475a5d89ff1dde29", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `time::Instant`
[INFO] [stderr]   --> src/kvs/kvs.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     time::Instant,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `KvsError`
[INFO] [stderr]  --> src/protocol/stream.rs:9:18
[INFO] [stderr]   |
[INFO] [stderr] 9 | use crate::kvs::{KvsError, Result};
[INFO] [stderr]   |                  ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]   --> src/server.rs:64:92
[INFO] [stderr]    |
[INFO] [stderr] 64 |                 Err(e) => error!(self.log, "Error establishing connection"; "message" => e.description()),
[INFO] [stderr]    |                                                                                            ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> src/protocol/client.rs:49:21
[INFO] [stderr]    |
[INFO] [stderr] 49 |                 let mut result = self.stream.read(&mut answer[..]).await?;
[INFO] [stderr]    |                     ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/protocol/client.rs:41:17
[INFO] [stderr]    |
[INFO] [stderr] 41 |             let mut result = self.stream.read(&mut answer[..]).await?;
[INFO] [stderr]    |                 ----^^^^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/protocol/client.rs:49:21
[INFO] [stderr]    |
[INFO] [stderr] 49 |                 let mut result = self.stream.read(&mut answer[..]).await?;
[INFO] [stderr]    |                     ----^^^^^^
[INFO] [stderr]    |                     |
[INFO] [stderr]    |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/kvs/kvs.rs:547:9
[INFO] [stderr]     |
[INFO] [stderr] 547 |         bufwriter.write_all(&self.min_fileid.load(Ordering::Relaxed).to_le_bytes()).await;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/server.rs:88:17
[INFO] [stderr]    |
[INFO] [stderr] 88 | /                 conn.send(response).await.map_err(|e| {
[INFO] [stderr] 89 | |                     error!(log, "Something went wrong in response to client {:?}", e);
[INFO] [stderr] 90 | |                 });
[INFO] [stderr]    | |___________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Mutex`
[INFO] [stderr]  --> tests/kv_store.rs:3:37
[INFO] [stderr]   |
[INFO] [stderr] 3 | use async_std::sync::{Arc, Barrier, Mutex};
[INFO] [stderr]   |                                     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]  --> tests/kv_store.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::thread;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bin/kvs-server.rs:143:5
[INFO] [stderr]     |
[INFO] [stderr] 143 | /     task::block_on(async {
[INFO] [stderr] 144 | |         check_your_engines(&db_path, &engine).await.map_err(|e| {
[INFO] [stderr] 145 | |             error!(log, "Check engine failed: {}", e);
[INFO] [stderr] 146 | |             panic!()
[INFO] [stderr] 147 | |         })
[INFO] [stderr] 148 | |     });
[INFO] [stderr]     | |_______^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.42s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/slammr-61e69aa1619bdc22
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/cli-0a2b644d4a7246d3
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 11 tests
[INFO] [stdout] test client_cli_invalid_set ... ok
[INFO] [stdout] test client_cli_invalid_subcommand ... ok
[INFO] [stderr] Oct 19 00:12:05.111 INFO Initializing, listening on: 127.0.0.1:4002, engine: sled, version: 0.1.0
[INFO] [stdout] test server_cli_version ... ok
[INFO] [stdout] test client_cli_version ... ok
[INFO] [stdout] test client_cli_no_args ... ok
[INFO] [stderr] Oct 19 00:12:05.175 INFO Initializing sled engine, db_path: .
[INFO] [stderr] Oct 19 00:12:05.179 INFO Initializing, listening on: 127.0.0.1:4005, engine: sled, version: 0.1.0
[INFO] [stderr] Oct 19 00:12:05.187 INFO Initializing, listening on: 127.0.0.1:4004, engine: kvs, version: 0.1.0
[INFO] [stderr] Oct 19 00:12:05.195 INFO Initializing sled engine, db_path: .
[INFO] [stdout] test client_cli_invalid_rm ... ok
[INFO] [stderr] Oct 19 00:12:05.214 INFO Initializing kvs engine, db_path: .
[INFO] [stdout] test client_cli_invalid_get ... ok
[INFO] [stdout] test cli_log_configuration ... ok
[INFO] [stderr] Oct 19 00:12:06.367 INFO Initializing, listening on: 127.0.0.1:4002, engine: kvs, version: 0.1.0
[INFO] [stderr] Oct 19 00:12:06.369 INFO Initializing kvs engine, db_path: .
[INFO] [stderr] Oct 19 00:12:06.643 INFO Initializing, listening on: 127.0.0.1:4005, engine: sled, version: 0.1.0
[INFO] [stderr] Oct 19 00:12:06.663 INFO Initializing sled engine, db_path: .
[INFO] [stderr] Oct 19 00:12:06.731 INFO Initializing, listening on: 127.0.0.1:4004, engine: kvs, version: 0.1.0
[INFO] [stderr] Oct 19 00:12:06.775 INFO Initializing kvs engine, db_path: .
[INFO] [stdout] test cli_wrong_engine ... ok
[INFO] [stdout] test cli_access_server_sled_engine ... ok
[INFO] [stdout] test cli_access_server_kvs_engine ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/kv_store-27acf97a6f3e9df3
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test remove_non_existent_key ... ok
[INFO] [stdout] test remove_key ... ok
[INFO] [stdout] test get_non_existent_value ... ok
[INFO] [stdout] test get_stored_value ... ok
[INFO] [stdout] test overwrite_value ... ok
[INFO] [stdout] test concurrent_get ... ok
[INFO] [stdout] test concurrent_set ... ok
[INFO] [stdout] test compaction ... test compaction has been running for over 60 seconds
[ERROR] error running command: no output for 300 seconds
[INFO] running `Command { std: "docker" "inspect" "9edd3a0130ad29129a55312dfa9b8b474449f958fa9e0524475a5d89ff1dde29", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9edd3a0130ad29129a55312dfa9b8b474449f958fa9e0524475a5d89ff1dde29", kill_on_drop: false }`
[INFO] [stdout] 9edd3a0130ad29129a55312dfa9b8b474449f958fa9e0524475a5d89ff1dde29
