[INFO] cloning repository https://github.com/amirrezaask/kv_tcp_rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/amirrezaask/kv_tcp_rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Famirrezaask%2Fkv_tcp_rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Famirrezaask%2Fkv_tcp_rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6350a72068781635cd732e947415ecc7292b5eb9
[INFO] checking amirrezaask/kv_tcp_rs against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Famirrezaask%2Fkv_tcp_rs" "/workspace/builds/worker-108/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-108/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/amirrezaask/kv_tcp_rs on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/amirrezaask/kv_tcp_rs
[INFO] finished tweaking git repo https://github.com/amirrezaask/kv_tcp_rs
[INFO] tweaked toml for git repo https://github.com/amirrezaask/kv_tcp_rs written to /workspace/builds/worker-108/source/Cargo.toml
[INFO] crate git repo https://github.com/amirrezaask/kv_tcp_rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8d078ef0bb324f84a03e6194a1541446551164157b4800f544a12836fd34759b
[INFO] running `Command { std: "docker" "start" "-a" "8d078ef0bb324f84a03e6194a1541446551164157b4800f544a12836fd34759b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8d078ef0bb324f84a03e6194a1541446551164157b4800f544a12836fd34759b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d078ef0bb324f84a03e6194a1541446551164157b4800f544a12836fd34759b", kill_on_drop: false }`
[INFO] [stdout] 8d078ef0bb324f84a03e6194a1541446551164157b4800f544a12836fd34759b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 431db65b752871e8ee6fc267799f9af623f0e8d95a199dc27c602e315a44bbeb
[INFO] running `Command { std: "docker" "start" "-a" "431db65b752871e8ee6fc267799f9af623f0e8d95a199dc27c602e315a44bbeb", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]     Checking bytes v1.1.0
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]     Checking instant v0.1.11
[INFO] [stderr]    Compiling tokio v1.12.0
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking mio v0.7.13
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]    Compiling tokio-macros v1.4.1
[INFO] [stderr]     Checking kv_tcp_rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]    --> src/main.rs:103:17
[INFO] [stdout]     |
[INFO] [stdout] 103 |             Err(err) => return Err("".to_string()),
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]    --> src/main.rs:103:17
[INFO] [stdout]     |
[INFO] [stdout] 103 |             Err(err) => return Err("".to_string()),
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 17s
[INFO] running `Command { std: "docker" "inspect" "431db65b752871e8ee6fc267799f9af623f0e8d95a199dc27c602e315a44bbeb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "431db65b752871e8ee6fc267799f9af623f0e8d95a199dc27c602e315a44bbeb", kill_on_drop: false }`
[INFO] [stdout] 431db65b752871e8ee6fc267799f9af623f0e8d95a199dc27c602e315a44bbeb