[INFO] cloning repository https://github.com/Quantumplation/rust-echo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Quantumplation/rust-echo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQuantumplation%2Frust-echo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQuantumplation%2Frust-echo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 956798ec5c61d17d04dc436394fd7fa3af5bbaff
[INFO] checking Quantumplation/rust-echo against try#2b43d8e161cfe46fae25518efb124c3c1d0fa392 for pr-145604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQuantumplation%2Frust-echo" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Quantumplation/rust-echo
[INFO] finished tweaking git repo https://github.com/Quantumplation/rust-echo
[INFO] tweaked toml for git repo https://github.com/Quantumplation/rust-echo written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Quantumplation/rust-echo on toolchain 2b43d8e161cfe46fae25518efb124c3c1d0fa392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2b43d8e161cfe46fae25518efb124c3c1d0fa392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Quantumplation/rust-echo 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" "+2b43d8e161cfe46fae25518efb124c3c1d0fa392" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded educe v0.5.11
[INFO] [stderr]   Downloaded tokio-serde v0.9.0
[INFO] [stderr]   Downloaded half v1.8.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+2b43d8e161cfe46fae25518efb124c3c1d0fa392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9f1f85bdd12466b5b8ddc6a768b418576fc21f851d526ac5e0c8165e0ab44b05
[INFO] running `Command { std: "docker" "start" "-a" "9f1f85bdd12466b5b8ddc6a768b418576fc21f851d526ac5e0c8165e0ab44b05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f1f85bdd12466b5b8ddc6a768b418576fc21f851d526ac5e0c8165e0ab44b05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f1f85bdd12466b5b8ddc6a768b418576fc21f851d526ac5e0c8165e0ab44b05", kill_on_drop: false }`
[INFO] [stdout] 9f1f85bdd12466b5b8ddc6a768b418576fc21f851d526ac5e0c8165e0ab44b05
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+2b43d8e161cfe46fae25518efb124c3c1d0fa392" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 991225fa2dd19e33392b02f9f01246e46b93dbfe094ec931adb98b371c72fd73
[INFO] running `Command { std: "docker" "start" "-a" "991225fa2dd19e33392b02f9f01246e46b93dbfe094ec931adb98b371c72fd73", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.85
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling libc v0.2.155
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[INFO] [stderr]     Checking smallvec v1.13.2
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[INFO] [stderr]    Compiling serde_derive v1.0.203
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[INFO] [stderr]     Checking tokio-serde v0.9.0
[INFO] [stderr]     Checking rust-echo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `io::stdin`
[INFO] [stdout]  --> src/main.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | use tokio::{io::stdin, net::{tcp::{OwnedReadHalf, OwnedWriteHalf}, TcpListener, TcpStream}, task::{spawn_blocking, JoinSet}};
[INFO] [stdout]   |             ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::stdin`
[INFO] [stdout]  --> src/main.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | use tokio::{io::stdin, net::{tcp::{OwnedReadHalf, OwnedWriteHalf}, TcpListener, TcpStream}, task::{spawn_blocking, JoinSet}};
[INFO] [stdout]   |             ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.37s
[INFO] running `Command { std: "docker" "inspect" "991225fa2dd19e33392b02f9f01246e46b93dbfe094ec931adb98b371c72fd73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "991225fa2dd19e33392b02f9f01246e46b93dbfe094ec931adb98b371c72fd73", kill_on_drop: false }`
[INFO] [stdout] 991225fa2dd19e33392b02f9f01246e46b93dbfe094ec931adb98b371c72fd73