[INFO] cloning repository https://github.com/tomatoaiu/rust-udp-echo-server
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tomatoaiu/rust-udp-echo-server" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomatoaiu%2Frust-udp-echo-server", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomatoaiu%2Frust-udp-echo-server'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 48dc4518736ca3aac5f03010fc337a689333bc5f
[INFO] checking tomatoaiu/rust-udp-echo-server against master#3aedcf06b73fc36feeebca3d579e1d2a6c40acc5 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomatoaiu%2Frust-udp-echo-server" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tomatoaiu/rust-udp-echo-server on toolchain 3aedcf06b73fc36feeebca3d579e1d2a6c40acc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tomatoaiu/rust-udp-echo-server
[INFO] finished tweaking git repo https://github.com/tomatoaiu/rust-udp-echo-server
[INFO] tweaked toml for git repo https://github.com/tomatoaiu/rust-udp-echo-server written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/tomatoaiu/rust-udp-echo-server already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/jobserver:/tmp/crater-runner-fifo:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b2702fd61beb146d2cf2db050006798e854386cfd8b58913596fc13899cf4cfc
[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" "b2702fd61beb146d2cf2db050006798e854386cfd8b58913596fc13899cf4cfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b2702fd61beb146d2cf2db050006798e854386cfd8b58913596fc13899cf4cfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2702fd61beb146d2cf2db050006798e854386cfd8b58913596fc13899cf4cfc", kill_on_drop: false }`
[INFO] [stdout] b2702fd61beb146d2cf2db050006798e854386cfd8b58913596fc13899cf4cfc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/jobserver:/tmp/crater-runner-fifo:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "RUSTUP_TOOLCHAIN=3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "-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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/tmp/crater-runner-fifo/jobserver-crater-fwd" "/opt/rustwide/cargo-home/bin/cargo" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 26215d5f7b7c1a56604b4b602fd5bd6be7a7216b3d8e45c5ecc9bb9813e9189b
[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" "26215d5f7b7c1a56604b4b602fd5bd6be7a7216b3d8e45c5ecc9bb9813e9189b", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-udp-echo-server v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::fmt::Debug`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::fmt::Debug;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | /         loop {
[INFO] [stdout] 15 | |             let mut buf = [0; 10];
[INFO] [stdout] 16 | |             let (amt, src) = socket.recv_from(&mut buf)?;
[INFO] [stdout] 17 | |             println!("From: {:?}, buf: {:?}", src, buf);
[INFO] [stdout] 18 | |
[INFO] [stdout] 19 | |             socket.send_to(&buf, send_to)?;
[INFO] [stdout] 20 | |         }
[INFO] [stdout]    | |_________- any code following this expression is unreachable
[INFO] [stdout] 21 |       }
[INFO] [stdout] 22 |       Ok(())
[INFO] [stdout]    |       ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `amt`
[INFO] [stdout]   --> src/main.rs:16:18
[INFO] [stdout]    |
[INFO] [stdout] 16 |             let (amt, src) = socket.recv_from(&mut buf)?;
[INFO] [stdout]    |                  ^^^ help: if this is intentional, prefix it with an underscore: `_amt`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let mut socket = UdpSocket::bind("0.0.0.0:".to_string() + &port.to_string())?;
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Debug`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::fmt::Debug;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | /         loop {
[INFO] [stdout] 15 | |             let mut buf = [0; 10];
[INFO] [stdout] 16 | |             let (amt, src) = socket.recv_from(&mut buf)?;
[INFO] [stdout] 17 | |             println!("From: {:?}, buf: {:?}", src, buf);
[INFO] [stdout] 18 | |
[INFO] [stdout] 19 | |             socket.send_to(&buf, send_to)?;
[INFO] [stdout] 20 | |         }
[INFO] [stdout]    | |_________- any code following this expression is unreachable
[INFO] [stdout] 21 |       }
[INFO] [stdout] 22 |       Ok(())
[INFO] [stdout]    |       ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `amt`
[INFO] [stdout]   --> src/main.rs:16:18
[INFO] [stdout]    |
[INFO] [stdout] 16 |             let (amt, src) = socket.recv_from(&mut buf)?;
[INFO] [stdout]    |                  ^^^ help: if this is intentional, prefix it with an underscore: `_amt`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let mut socket = UdpSocket::bind("0.0.0.0:".to_string() + &port.to_string())?;
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.41s
[INFO] running `Command { std: "docker" "inspect" "26215d5f7b7c1a56604b4b602fd5bd6be7a7216b3d8e45c5ecc9bb9813e9189b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26215d5f7b7c1a56604b4b602fd5bd6be7a7216b3d8e45c5ecc9bb9813e9189b", kill_on_drop: false }`
[INFO] [stdout] 26215d5f7b7c1a56604b4b602fd5bd6be7a7216b3d8e45c5ecc9bb9813e9189b