[INFO] cloning repository https://github.com/jianantian/kvs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jianantian/kvs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjianantian%2Fkvs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjianantian%2Fkvs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1d3b14dced9bb45de62eb96938c114e25aaeb78e
[INFO] checking jianantian/kvs against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjianantian%2Fkvs" "/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/jianantian/kvs on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jianantian/kvs
[INFO] finished tweaking git repo https://github.com/jianantian/kvs
[INFO] tweaked toml for git repo https://github.com/jianantian/kvs written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/jianantian/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" "+22572d0994593197593e2a1b7b18d720a9a349a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f8175a89e6d256c6292ca4e6b62548c3cf8378635dae0148e045609bb5b7f13c
[INFO] running `Command { std: "docker" "start" "-a" "f8175a89e6d256c6292ca4e6b62548c3cf8378635dae0148e045609bb5b7f13c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f8175a89e6d256c6292ca4e6b62548c3cf8378635dae0148e045609bb5b7f13c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8175a89e6d256c6292ca4e6b62548c3cf8378635dae0148e045609bb5b7f13c", kill_on_drop: false }`
[INFO] [stdout] f8175a89e6d256c6292ca4e6b62548c3cf8378635dae0148e045609bb5b7f13c
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4819e8b127387c64ba0e6c0c64b06c55a30ed6edaa820ea323214c50213ff71f
[INFO] running `Command { std: "docker" "start" "-a" "4819e8b127387c64ba0e6c0c64b06c55a30ed6edaa820ea323214c50213ff71f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.65
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.8
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling serde v1.0.102
[INFO] [stderr]    Compiling ryu v1.0.2
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling getrandom v0.1.13
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling num-traits v0.2.9
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking aho-corasick v0.7.6
[INFO] [stderr]     Checking regex-syntax v0.6.12
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]    Compiling escargot v0.4.0
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking predicates-core v1.0.0
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking treeline v0.1.0
[INFO] [stderr]     Checking normalize-line-endings v0.2.2
[INFO] [stderr]     Checking predicates-tree v1.0.0
[INFO] [stderr]     Checking remove_dir_all v0.5.2
[INFO] [stderr]     Checking same-file v1.0.5
[INFO] [stderr]     Checking float-cmp v0.4.0
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]     Checking walkdir v2.2.9
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking regex v1.3.1
[INFO] [stderr]    Compiling serde_derive v1.0.102
[INFO] [stderr]     Checking predicates v1.0.1
[INFO] [stderr]     Checking serde_json v1.0.41
[INFO] [stderr]     Checking kvs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Serializer`
[INFO] [stdout]  --> src/kv.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 | use serde_json::{Deserializer, Serializer};
[INFO] [stdout]   |                                ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `new_writer` is never used
[INFO] [stdout]    --> src/kv.rs:245:4
[INFO] [stdout]     |
[INFO] [stdout] 245 | fn new_writer(fname: &Path, pos: u64) -> Result<BufWriterWithPos<File>, String> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stdout] warning: unused import: `Serializer`
[INFO] [stdout]  --> src/kv.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 | use serde_json::{Deserializer, Serializer};
[INFO] [stdout]   |                                ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `new_writer` is never used
[INFO] [stdout]    --> src/kv.rs:245:4
[INFO] [stdout]     |
[INFO] [stdout] 245 | fn new_writer(fname: &Path, pos: u64) -> Result<BufWriterWithPos<File>, String> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 22.97s
[INFO] running `Command { std: "docker" "inspect" "4819e8b127387c64ba0e6c0c64b06c55a30ed6edaa820ea323214c50213ff71f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4819e8b127387c64ba0e6c0c64b06c55a30ed6edaa820ea323214c50213ff71f", kill_on_drop: false }`
[INFO] [stdout] 4819e8b127387c64ba0e6c0c64b06c55a30ed6edaa820ea323214c50213ff71f