[INFO] cloning repository https://github.com/kindermax/pingcap-course-kvs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kindermax/pingcap-course-kvs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkindermax%2Fpingcap-course-kvs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkindermax%2Fpingcap-course-kvs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6969eb530f8ccfaf8235b915f4ae16775ea42b5d
[INFO] checking kindermax/pingcap-course-kvs against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkindermax%2Fpingcap-course-kvs" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kindermax/pingcap-course-kvs on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kindermax/pingcap-course-kvs
[INFO] finished tweaking git repo https://github.com/kindermax/pingcap-course-kvs
[INFO] tweaked toml for git repo https://github.com/kindermax/pingcap-course-kvs written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kindermax/pingcap-course-kvs 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/crossbeam-rs/crossbeam.git`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded panic-control v0.1.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 22699e6b937aca275cf2b4c1997aa44e8db7935304326b1e35b6dd29a5b71c93
[INFO] running `Command { std: "docker" "start" "-a" "22699e6b937aca275cf2b4c1997aa44e8db7935304326b1e35b6dd29a5b71c93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "22699e6b937aca275cf2b4c1997aa44e8db7935304326b1e35b6dd29a5b71c93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22699e6b937aca275cf2b4c1997aa44e8db7935304326b1e35b6dd29a5b71c93", kill_on_drop: false }`
[INFO] [stdout] 22699e6b937aca275cf2b4c1997aa44e8db7935304326b1e35b6dd29a5b71c93
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0518745e53f09c777d6b355ed2bd7389c4e2c4b57c0fbc32387cfc26b0995fba
[INFO] running `Command { std: "docker" "start" "-a" "0518745e53f09c777d6b355ed2bd7389c4e2c4b57c0fbc32387cfc26b0995fba", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.38
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]    Compiling libc v0.2.125
[INFO] [stderr]    Compiling syn v1.0.94
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.8
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]     Checking ryu v1.0.9
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking itoa v1.0.1
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]    Compiling semver v1.0.9
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling lock_api v0.4.7
[INFO] [stderr]    Compiling crossbeam-utils v0.8.10 (https://github.com/crossbeam-rs/crossbeam.git?branch=master#4b949c2b)
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling backtrace v0.3.65
[INFO] [stderr]    Compiling indexmap v1.8.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.9 (https://github.com/crossbeam-rs/crossbeam.git?branch=master#4b949c2b)
[INFO] [stderr]     Checking smallvec v1.8.0
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]    Compiling crossbeam-queue v0.3.5
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking miniz_oxide v0.5.1
[INFO] [stderr]     Checking object v0.28.4
[INFO] [stderr]     Checking os_str_bytes v6.0.1
[INFO] [stderr]    Compiling crossbeam-skiplist v0.0.0 (https://github.com/crossbeam-rs/crossbeam.git?branch=master#4b949c2b)
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking clap_lex v0.2.0
[INFO] [stderr]     Checking predicates-core v1.0.3
[INFO] [stderr]     Checking plotters-backend v0.3.2
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling escargot v0.4.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.4
[INFO] [stderr]     Checking plotters-svg v0.3.1
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[INFO] [stderr]     Checking atty v0.2.14
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[INFO] [stderr]     Checking parking_lot_core v0.8.5
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[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking termtree v0.2.4
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]     Checking half v1.8.2
[INFO] [stderr]     Checking rayon-core v1.9.3
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking crossbeam v0.8.1
[INFO] [stderr]     Checking float-cmp v0.8.0
[INFO] [stderr]     Checking normalize-line-endings v0.3.0
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking plotters v0.3.1
[INFO] [stderr]     Checking sled v0.34.7
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking predicates-tree v1.0.5
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking oorandom v11.1.3
[INFO] [stderr]     Checking fastrand v1.7.0
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking panic-control v0.1.4
[INFO] [stderr]     Checking rayon v1.5.3
[INFO] [stderr]     Checking tempfile v3.3.0
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]     Checking criterion-plot v0.4.4
[INFO] [stderr]     Checking env_logger v0.9.0
[INFO] [stderr]     Checking predicates v1.0.8
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling serde_derive v1.0.137
[INFO] [stderr]    Compiling clap_derive v3.1.18
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking clap v3.1.18
[INFO] [stderr]     Checking serde v1.0.137
[INFO] [stderr]     Checking serde_json v1.0.81
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking kvs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `sled` is imported redundantly
[INFO] [stdout]  --> src/engines/sled.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use sled;
[INFO] [stdout]   |     ^^^^ the item `sled` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking criterion v0.3.5
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stdout] warning: the item `sled` is imported redundantly
[INFO] [stdout]  --> benches/engine_bench.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use sled;
[INFO] [stdout]   |     ^^^^ the item `sled` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `sled` is imported redundantly
[INFO] [stdout]  --> src/engines/sled.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use sled;
[INFO] [stdout]   |     ^^^^ the item `sled` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> benches/engine_bench.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 |             |(mut store, _temp_dir)| {
[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]   --> benches/engine_bench.rs:29:15
[INFO] [stdout]    |
[INFO] [stdout] 29 |             |(mut db, _temp_dir)| {
[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]   --> benches/engine_bench.rs:45:17
[INFO] [stdout]    |
[INFO] [stdout] 45 |             let mut store = KvStore::open(temp_dir.path()).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]   --> benches/engine_bench.rs:62:17
[INFO] [stdout]    |
[INFO] [stdout] 62 |             let mut db = SledKvsEngine::new(sled::open(&temp_dir).unwrap());
[INFO] [stdout]    |                 ----^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 34.06s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.3.5
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "0518745e53f09c777d6b355ed2bd7389c4e2c4b57c0fbc32387cfc26b0995fba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0518745e53f09c777d6b355ed2bd7389c4e2c4b57c0fbc32387cfc26b0995fba", kill_on_drop: false }`
[INFO] [stdout] 0518745e53f09c777d6b355ed2bd7389c4e2c4b57c0fbc32387cfc26b0995fba
[INFO] checking kindermax/pingcap-course-kvs against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkindermax%2Fpingcap-course-kvs" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kindermax/pingcap-course-kvs on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kindermax/pingcap-course-kvs
[INFO] finished tweaking git repo https://github.com/kindermax/pingcap-course-kvs
[INFO] tweaked toml for git repo https://github.com/kindermax/pingcap-course-kvs written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kindermax/pingcap-course-kvs 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0265be3600b9b0f34efa6474a3a3c0513ff9fd1405bbdaa328e6c2cc7db0c328
[INFO] running `Command { std: "docker" "start" "-a" "0265be3600b9b0f34efa6474a3a3c0513ff9fd1405bbdaa328e6c2cc7db0c328", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0265be3600b9b0f34efa6474a3a3c0513ff9fd1405bbdaa328e6c2cc7db0c328", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0265be3600b9b0f34efa6474a3a3c0513ff9fd1405bbdaa328e6c2cc7db0c328", kill_on_drop: false }`
[INFO] [stdout] 0265be3600b9b0f34efa6474a3a3c0513ff9fd1405bbdaa328e6c2cc7db0c328
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2e4ad8cc5700a4ec8b75b58b5aa000cdb62706e7737072d12f8486d2d6828cb4
[INFO] running `Command { std: "docker" "start" "-a" "2e4ad8cc5700a4ec8b75b58b5aa000cdb62706e7737072d12f8486d2d6828cb4", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.38
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]    Compiling libc v0.2.125
[INFO] [stderr]    Compiling syn v1.0.94
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.8
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking ryu v1.0.9
[INFO] [stderr]    Compiling semver v1.0.9
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking itoa v1.0.1
[INFO] [stderr]    Compiling lock_api v0.4.7
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling crossbeam-utils v0.8.10 (https://github.com/crossbeam-rs/crossbeam.git?branch=master#4b949c2b)
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling backtrace v0.3.65
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.9 (https://github.com/crossbeam-rs/crossbeam.git?branch=master#4b949c2b)
[INFO] [stderr]    Compiling indexmap v1.8.1
[INFO] [stderr]     Checking smallvec v1.8.0
[INFO] [stderr]    Compiling crossbeam-queue v0.3.5
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]     Checking miniz_oxide v0.5.1
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking object v0.28.4
[INFO] [stderr]    Compiling crossbeam-skiplist v0.0.0 (https://github.com/crossbeam-rs/crossbeam.git?branch=master#4b949c2b)
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[INFO] [stdout] warning: the item `sled` is imported redundantly
[INFO] [stdout]  --> src/engines/sled.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use sled;
[INFO] [stdout]   |     ^^^^ the item `sled` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking criterion v0.3.5
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stdout] warning: the item `sled` is imported redundantly
[INFO] [stdout]  --> src/engines/sled.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use sled;
[INFO] [stdout]   |     ^^^^ the item `sled` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `sled` is imported redundantly
[INFO] [stdout]  --> benches/engine_bench.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use sled;
[INFO] [stdout]   |     ^^^^ the item `sled` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> benches/engine_bench.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 |             |(mut store, _temp_dir)| {
[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]   --> benches/engine_bench.rs:29:15
[INFO] [stdout]    |
[INFO] [stdout] 29 |             |(mut db, _temp_dir)| {
[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]   --> benches/engine_bench.rs:45:17
[INFO] [stdout]    |
[INFO] [stdout] 45 |             let mut store = KvStore::open(temp_dir.path()).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]   --> benches/engine_bench.rs:62:17
[INFO] [stdout]    |
[INFO] [stdout] 62 |             let mut db = SledKvsEngine::new(sled::open(&temp_dir).unwrap());
[INFO] [stdout]    |                 ----^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 32.30s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.3.5
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "2e4ad8cc5700a4ec8b75b58b5aa000cdb62706e7737072d12f8486d2d6828cb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e4ad8cc5700a4ec8b75b58b5aa000cdb62706e7737072d12f8486d2d6828cb4", kill_on_drop: false }`
[INFO] [stdout] 2e4ad8cc5700a4ec8b75b58b5aa000cdb62706e7737072d12f8486d2d6828cb4