[INFO] cloning repository https://github.com/Kourin1996/rust_playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Kourin1996/rust_playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKourin1996%2Frust_playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKourin1996%2Frust_playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4ff9dc3b14ca298e1b3cf8e9150b22fcef9d6d8f
[INFO] checking Kourin1996/rust_playground against try#3857be5045fe74bd0f296f6f4c23db10f8857f73 for pr-156807
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKourin1996%2Frust_playground" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Kourin1996/rust_playground
[INFO] finished tweaking git repo https://github.com/Kourin1996/rust_playground
[INFO] tweaked toml for git repo https://github.com/Kourin1996/rust_playground written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Kourin1996/rust_playground on toolchain 3857be5045fe74bd0f296f6f4c23db10f8857f73
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Kourin1996/rust_playground 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" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking Kourin1996/rust_playground against try#3857be5045fe74bd0f296f6f4c23db10f8857f73 for pr-156807
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKourin1996%2Frust_playground" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Kourin1996/rust_playground
[INFO] finished tweaking git repo https://github.com/Kourin1996/rust_playground
[INFO] tweaked toml for git repo https://github.com/Kourin1996/rust_playground written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Kourin1996/rust_playground on toolchain 3857be5045fe74bd0f296f6f4c23db10f8857f73
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Kourin1996/rust_playground 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" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9af708e1da569ae59a0be05526fecabf37e484add9b2ebe937be58d9aa2f0da1
[INFO] running `Command { std: "docker" "start" "-a" "9af708e1da569ae59a0be05526fecabf37e484add9b2ebe937be58d9aa2f0da1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9af708e1da569ae59a0be05526fecabf37e484add9b2ebe937be58d9aa2f0da1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9af708e1da569ae59a0be05526fecabf37e484add9b2ebe937be58d9aa2f0da1", kill_on_drop: false }`
[INFO] [stdout] 9af708e1da569ae59a0be05526fecabf37e484add9b2ebe937be58d9aa2f0da1
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 293021a12248d73cd1334fb4bcc6a11c66cbd24397bc264b96205eb3d2178a6a
[INFO] running `Command { std: "docker" "start" "-a" "293021a12248d73cd1334fb4bcc6a11c66cbd24397bc264b96205eb3d2178a6a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.183
[INFO] [stderr]    Compiling proc-macro2 v1.0.82
[INFO] [stderr]     Checking smallvec v1.13.2
[INFO] [stderr]    Compiling thiserror v1.0.61
[INFO] [stderr]     Checking bytes v1.6.0
[INFO] [stderr]     Checking keccak v0.1.6
[INFO] [stderr]     Checking pin-project-lite v0.2.14
[INFO] [stderr]     Checking rustc-hex v2.1.0
[INFO] [stderr]     Checking sha3 v0.10.8
[INFO] [stderr]     Checking rlp v0.5.2
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling syn v2.0.61
[INFO] [stderr]     Checking parking_lot_core v0.9.10
[INFO] [stderr]     Checking mio v0.8.11
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking socket2 v0.5.7
[INFO] [stderr]     Checking signal-hook-registry v1.4.2
[INFO] [stderr]     Checking parking_lot v0.12.2
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.61
[INFO] [stderr]     Checking tokio v1.37.0
[INFO] [stderr]     Checking rust_playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/bin/02_tcp_client/main.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     process::exit(0);
[INFO] [stdout]    |     ---------------- any code following this expression is unreachable
[INFO] [stdout] 41 |
[INFO] [stdout] 42 |     Ok(())
[INFO] [stdout]    |     ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/bin/02_tcp_client/main.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     process::exit(0);
[INFO] [stdout]    |     ---------------- any code following this expression is unreachable
[INFO] [stdout] 41 |
[INFO] [stdout] 42 |     Ok(())
[INFO] [stdout]    |     ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.33s
[INFO] running `Command { std: "docker" "inspect" "293021a12248d73cd1334fb4bcc6a11c66cbd24397bc264b96205eb3d2178a6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "293021a12248d73cd1334fb4bcc6a11c66cbd24397bc264b96205eb3d2178a6a", kill_on_drop: false }`
[INFO] [stdout] 293021a12248d73cd1334fb4bcc6a11c66cbd24397bc264b96205eb3d2178a6a