[INFO] cloning repository https://github.com/SilvioPilato/Hash-Index-KV-Store
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/SilvioPilato/Hash-Index-KV-Store" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSilvioPilato%2FHash-Index-KV-Store", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSilvioPilato%2FHash-Index-KV-Store'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 17e23812b02a5b99cfd9079a3ff149c3858b28fd
[INFO] checking SilvioPilato/Hash-Index-KV-Store against master#57f772f25c5ce2bd870d6f8c3ab318eaee5a3326 for pr-133502-22
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSilvioPilato%2FHash-Index-KV-Store" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/SilvioPilato/Hash-Index-KV-Store
[INFO] finished tweaking git repo https://github.com/SilvioPilato/Hash-Index-KV-Store
[INFO] tweaked toml for git repo https://github.com/SilvioPilato/Hash-Index-KV-Store written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/SilvioPilato/Hash-Index-KV-Store on toolchain 57f772f25c5ce2bd870d6f8c3ab318eaee5a3326
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+57f772f25c5ce2bd870d6f8c3ab318eaee5a3326" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/SilvioPilato/Hash-Index-KV-Store already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+57f772f25c5ce2bd870d6f8c3ab318eaee5a3326" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/SilvioPilato/mio-runtime.git`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded sha1_smol v1.0.1
[INFO] [stderr]   Downloaded redis v0.27.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+57f772f25c5ce2bd870d6f8c3ab318eaee5a3326" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e2333fce77e37c682e9cdc07b59f625764941ecd80f9428d3667f7148aedb448
[INFO] running `Command { std: "docker" "start" "-a" "e2333fce77e37c682e9cdc07b59f625764941ecd80f9428d3667f7148aedb448", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e2333fce77e37c682e9cdc07b59f625764941ecd80f9428d3667f7148aedb448", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e2333fce77e37c682e9cdc07b59f625764941ecd80f9428d3667f7148aedb448", kill_on_drop: false }`
[INFO] [stdout] e2333fce77e37c682e9cdc07b59f625764941ecd80f9428d3667f7148aedb448
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+57f772f25c5ce2bd870d6f8c3ab318eaee5a3326" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 269afc2a3d9255dcd9832ea79103641e0d250d24a9ddfc067d72c397e72a3b59
[INFO] running `Command { std: "docker" "start" "-a" "269afc2a3d9255dcd9832ea79103641e0d250d24a9ddfc067d72c397e72a3b59", kill_on_drop: false }`
[INFO] [stderr]    Compiling parking_lot_core v0.8.6
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking instant v0.1.13
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking sha1_smol v1.0.1
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking arc-swap v1.9.1
[INFO] [stderr]     Checking combine v4.6.7
[INFO] [stderr]     Checking socket2 v0.5.10
[INFO] [stderr]     Checking mio v1.2.0
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking mio-runtime v0.1.0 (https://github.com/SilvioPilato/mio-runtime.git#aaad7cba)
[INFO] [stderr]     Checking sled v0.34.7
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking num-bigint v0.4.6
[INFO] [stderr]    Compiling synstructure v0.13.2
[INFO] [stderr]    Compiling zerovec-derive v0.11.3
[INFO] [stderr]    Compiling displaydoc v0.2.5
[INFO] [stderr]    Compiling zerofrom-derive v0.1.7
[INFO] [stderr]    Compiling yoke-derive v0.8.2
[INFO] [stderr]     Checking zerofrom v0.1.7
[INFO] [stderr]     Checking yoke v0.8.2
[INFO] [stderr]     Checking zerotrie v0.2.4
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[INFO] [stderr]     Checking tinystr v0.8.3
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[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/hint.rs:92:9
[INFO] [stdout]    |
[INFO] [stdout] 92 |     let mut db = KVEngine::new(
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/hint.rs:116:13
[INFO] [stdout]     |
[INFO] [stdout] 116 |         let mut db = KVEngine::new(
[INFO] [stdout]     |             ----^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/hint.rs:151:13
[INFO] [stdout]     |
[INFO] [stdout] 151 |         let mut db = KVEngine::new(
[INFO] [stdout]     |             ----^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/hint.rs:187:9
[INFO] [stdout]     |
[INFO] [stdout] 187 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/hint.rs:225:9
[INFO] [stdout]     |
[INFO] [stdout] 225 |     let mut db = KVEngine::new(&path, "test", 50, FSyncStrategy::Always).unwrap();
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/db.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let mut db = KVEngine::new(
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/db.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut db = KVEngine::new(
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/db.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let mut db = KVEngine::new(
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/db.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |     let mut db = KVEngine::new(
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/db.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let mut db = KVEngine::new(
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:116:9
[INFO] [stdout]     |
[INFO] [stdout] 116 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:139:9
[INFO] [stdout]     |
[INFO] [stdout] 139 |     let mut db = KVEngine::new(&path, "test", 50, FSyncStrategy::Always).unwrap();
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/worker.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let mut db = KVEngine::new(
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/worker.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let mut db = KVEngine::new(
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:154:13
[INFO] [stdout]     |
[INFO] [stdout] 154 |         let mut db = KVEngine::new(&path, "test", 50, FSyncStrategy::Always).unwrap();
[INFO] [stdout]     |             ----^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:172:9
[INFO] [stdout]     |
[INFO] [stdout] 172 |     let mut db = KVEngine::new(&path, "test", 50, FSyncStrategy::Always).unwrap();
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:186:9
[INFO] [stdout]     |
[INFO] [stdout] 186 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:203:9
[INFO] [stdout]     |
[INFO] [stdout] 203 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:221:9
[INFO] [stdout]     |
[INFO] [stdout] 221 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:236:9
[INFO] [stdout]     |
[INFO] [stdout] 236 |     let mut db = KVEngine::new(&path, "test", 50, FSyncStrategy::EveryN(2)).unwrap();
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:250:9
[INFO] [stdout]     |
[INFO] [stdout] 250 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:305:9
[INFO] [stdout]     |
[INFO] [stdout] 305 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:323:9
[INFO] [stdout]     |
[INFO] [stdout] 323 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:342:9
[INFO] [stdout]     |
[INFO] [stdout] 342 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:370:9
[INFO] [stdout]     |
[INFO] [stdout] 370 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/db.rs:395:9
[INFO] [stdout]     |
[INFO] [stdout] 395 |     let mut db = KVEngine::new(
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/lsmengine.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/lsmengine.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/lsmengine.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/lsmengine.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:111:9
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:130:9
[INFO] [stdout]     |
[INFO] [stdout] 130 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:141:9
[INFO] [stdout]     |
[INFO] [stdout] 141 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:156:9
[INFO] [stdout]     |
[INFO] [stdout] 156 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:169:9
[INFO] [stdout]     |
[INFO] [stdout] 169 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:181:9
[INFO] [stdout]     |
[INFO] [stdout] 181 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:198:13
[INFO] [stdout]     |
[INFO] [stdout] 198 |         let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:213:9
[INFO] [stdout]     |
[INFO] [stdout] 213 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:257:13
[INFO] [stdout]     |
[INFO] [stdout] 257 |         let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:285:13
[INFO] [stdout]     |
[INFO] [stdout] 285 |         let mut engine = new_engine(&dir, "test", 1).unwrap(); // threshold=1 flushes immediately
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:289:13
[INFO] [stdout]     |
[INFO] [stdout] 289 |         let mut engine = engine_from_dir(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:304:13
[INFO] [stdout]     |
[INFO] [stdout] 304 |         let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:331:9
[INFO] [stdout]     |
[INFO] [stdout] 331 |     let mut engine = new_engine(&dir, "test", 1).unwrap(); // threshold=1, every write flushes
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:345:9
[INFO] [stdout]     |
[INFO] [stdout] 345 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:360:9
[INFO] [stdout]     |
[INFO] [stdout] 360 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:371:9
[INFO] [stdout]     |
[INFO] [stdout] 371 |     let mut engine = new_engine(&dir, "test", 1).unwrap(); // threshold=1, every write flushes
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:380:9
[INFO] [stdout]     |
[INFO] [stdout] 380 |     let mut engine = new_engine(&dir, "test", 1).unwrap(); // threshold=1, flushes on set
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:389:9
[INFO] [stdout]     |
[INFO] [stdout] 389 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:402:9
[INFO] [stdout]     |
[INFO] [stdout] 402 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:417:9
[INFO] [stdout]     |
[INFO] [stdout] 417 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:434:9
[INFO] [stdout]     |
[INFO] [stdout] 434 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:436:9
[INFO] [stdout]     |
[INFO] [stdout] 436 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:447:9
[INFO] [stdout]     |
[INFO] [stdout] 447 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:466:9
[INFO] [stdout]     |
[INFO] [stdout] 466 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:484:9
[INFO] [stdout]     |
[INFO] [stdout] 484 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:495:9
[INFO] [stdout]     |
[INFO] [stdout] 495 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:509:9
[INFO] [stdout]     |
[INFO] [stdout] 509 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:553:9
[INFO] [stdout]     |
[INFO] [stdout] 553 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:556:9
[INFO] [stdout]     |
[INFO] [stdout] 556 |     let mut engine = engine_from_dir(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:582:9
[INFO] [stdout]     |
[INFO] [stdout] 582 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:594:9
[INFO] [stdout]     |
[INFO] [stdout] 594 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/lsmengine.rs:607:9
[INFO] [stdout]     |
[INFO] [stdout] 607 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/leveled.rs:76:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/leveled.rs:92:9
[INFO] [stdout]    |
[INFO] [stdout] 92 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:111:9
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:148:9
[INFO] [stdout]     |
[INFO] [stdout] 148 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:161:9
[INFO] [stdout]     |
[INFO] [stdout] 161 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:172:9
[INFO] [stdout]     |
[INFO] [stdout] 172 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:187:9
[INFO] [stdout]     |
[INFO] [stdout] 187 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:200:9
[INFO] [stdout]     |
[INFO] [stdout] 200 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:212:9
[INFO] [stdout]     |
[INFO] [stdout] 212 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:231:13
[INFO] [stdout]     |
[INFO] [stdout] 231 |         let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:247:13
[INFO] [stdout]     |
[INFO] [stdout] 247 |         let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:281:13
[INFO] [stdout]     |
[INFO] [stdout] 281 |         let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:306:9
[INFO] [stdout]     |
[INFO] [stdout] 306 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:321:9
[INFO] [stdout]     |
[INFO] [stdout] 321 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:330:9
[INFO] [stdout]     |
[INFO] [stdout] 330 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:340:9
[INFO] [stdout]     |
[INFO] [stdout] 340 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:353:9
[INFO] [stdout]     |
[INFO] [stdout] 353 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:384:9
[INFO] [stdout]     |
[INFO] [stdout] 384 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:425:9
[INFO] [stdout]     |
[INFO] [stdout] 425 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:446:9
[INFO] [stdout]     |
[INFO] [stdout] 446 |     let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:468:13
[INFO] [stdout]     |
[INFO] [stdout] 468 |         let mut engine = new_engine(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:488:13
[INFO] [stdout]     |
[INFO] [stdout] 488 |         let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:492:13
[INFO] [stdout]     |
[INFO] [stdout] 492 |         let mut engine = engine_from_dir(&dir, "test", BIG_MEMTABLE).unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:505:9
[INFO] [stdout]     |
[INFO] [stdout] 505 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/leveled.rs:526:9
[INFO] [stdout]     |
[INFO] [stdout] 526 |     let mut engine = new_engine(&dir, "test", 1).unwrap();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 22.64s
[INFO] running `Command { std: "docker" "inspect" "269afc2a3d9255dcd9832ea79103641e0d250d24a9ddfc067d72c397e72a3b59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "269afc2a3d9255dcd9832ea79103641e0d250d24a9ddfc067d72c397e72a3b59", kill_on_drop: false }`
[INFO] [stdout] 269afc2a3d9255dcd9832ea79103641e0d250d24a9ddfc067d72c397e72a3b59
