[INFO] cloning repository https://github.com/longfangsong/mini-kv
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/longfangsong/mini-kv" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flongfangsong%2Fmini-kv", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flongfangsong%2Fmini-kv'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a8e29d7435340fb7ddec5da1e10656902587c1ce
[INFO] checking longfangsong/mini-kv against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flongfangsong%2Fmini-kv" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/longfangsong/mini-kv on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/longfangsong/mini-kv
[INFO] finished tweaking git repo https://github.com/longfangsong/mini-kv
[INFO] tweaked toml for git repo https://github.com/longfangsong/mini-kv written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/longfangsong/mini-kv already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 37dde35235df1c8e153b20fdb687368d1ea5590e653afb7de1af89e87c306164
[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" "37dde35235df1c8e153b20fdb687368d1ea5590e653afb7de1af89e87c306164", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "37dde35235df1c8e153b20fdb687368d1ea5590e653afb7de1af89e87c306164", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37dde35235df1c8e153b20fdb687368d1ea5590e653afb7de1af89e87c306164", kill_on_drop: false }`
[INFO] [stdout] 37dde35235df1c8e153b20fdb687368d1ea5590e653afb7de1af89e87c306164
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d78a826d940b28b90b59c964177894d16f3b3c62f5c178b675746a8771d3b72d
[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" "d78a826d940b28b90b59c964177894d16f3b3c62f5c178b675746a8771d3b72d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling bindgen v0.51.1
[INFO] [stderr]    Compiling bytes v0.5.4
[INFO] [stderr]    Compiling failure_derive v0.1.7
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling proc-macro-nested v0.1.4
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]    Compiling protobuf v2.14.0
[INFO] [stderr]     Checking nodrop v0.1.14
[INFO] [stderr]     Checking futures-sink v0.3.4
[INFO] [stderr]     Checking futures-io v0.3.4
[INFO] [stderr]     Checking futures-task v0.3.4
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]     Checking rgb v0.8.17
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling clang-sys v0.28.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.36
[INFO] [stderr]    Compiling cpp_demangle v0.2.15
[INFO] [stderr]    Compiling symbolic-demangle v6.1.4
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling anyhow v1.0.28
[INFO] [stderr]     Checking quick-xml v0.18.1
[INFO] [stderr]    Compiling aho-corasick v0.7.10
[INFO] [stderr]     Checking msvc-demangler v0.7.0
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]     Checking regex v1.3.7
[INFO] [stderr]    Compiling indexmap v1.3.2
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking num-format v0.4.0
[INFO] [stderr]     Checking debugid v0.5.3
[INFO] [stderr]    Compiling cexpr v0.3.6
[INFO] [stderr]    Compiling petgraph v0.5.0
[INFO] [stderr]     Checking tokio-executor v0.1.10
[INFO] [stderr]     Checking tokio-current-thread v0.1.7
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling which v3.1.1
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking nix v0.16.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking backtrace v0.3.46
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]     Checking futures-locks v0.5.0
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling prost-build v0.6.1
[INFO] [stderr]    Compiling const-random-macro v0.1.8
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]     Checking const-random v0.1.8
[INFO] [stderr]     Checking ahash v0.3.3
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking inferno v0.9.5
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling prost-derive v0.6.1
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]    Compiling thiserror-impl v1.0.15
[INFO] [stderr]    Compiling grpcio-sys v0.5.2
[INFO] [stderr]     Checking failure v0.1.7
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking thiserror v1.0.15
[INFO] [stderr]     Checking symbolic-common v6.1.4
[INFO] [stderr]    Compiling prost v0.6.1
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]    Compiling prost-types v0.6.1
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]    Compiling pprof v0.3.16
[INFO] [stderr]     Checking grpcio v0.5.1
[INFO] [stderr]     Checking rpc v0.1.0 (/opt/rustwide/workdir/rpc)
[INFO] [stderr]     Checking mini-kv v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `key` is never read
[INFO] [stdout]   --> src/test/benchmark.rs:38:21
[INFO] [stdout]    |
[INFO] [stdout] 38 |             let mut key = [0u8; 8];
[INFO] [stdout]    |                     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scan`
[INFO] [stdout]   --> src/test/benchmark.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let scan = 0.1;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_scan`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `key` is never read
[INFO] [stdout]   --> src/test/benchmark.rs:38:21
[INFO] [stdout]    |
[INFO] [stdout] 38 |             let mut key = [0u8; 8];
[INFO] [stdout]    |                     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scan`
[INFO] [stdout]   --> src/test/benchmark.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let scan = 0.1;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_scan`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3m 03s
[INFO] running `Command { std: "docker" "inspect" "d78a826d940b28b90b59c964177894d16f3b3c62f5c178b675746a8771d3b72d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d78a826d940b28b90b59c964177894d16f3b3c62f5c178b675746a8771d3b72d", kill_on_drop: false }`
[INFO] [stdout] d78a826d940b28b90b59c964177894d16f3b3c62f5c178b675746a8771d3b72d