[INFO] cloning repository https://github.com/cheng404/simple-tcp-server-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cheng404/simple-tcp-server-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcheng404%2Fsimple-tcp-server-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcheng404%2Fsimple-tcp-server-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7871393efa99c8a85205340e69b3c7a6482279ec
[INFO] checking cheng404/simple-tcp-server-rs against try#a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d for pr-145342-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcheng404%2Fsimple-tcp-server-rs" "/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/cheng404/simple-tcp-server-rs
[INFO] finished tweaking git repo https://github.com/cheng404/simple-tcp-server-rs
[INFO] tweaked toml for git repo https://github.com/cheng404/simple-tcp-server-rs written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/cheng404/simple-tcp-server-rs on toolchain a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/cheng404/simple-tcp-server-rs 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" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f697dc60a7e0406628fa588557f43ce30f8f1ab531c7df07687ee235f0ddb4e
[INFO] running `Command { std: "docker" "start" "-a" "8f697dc60a7e0406628fa588557f43ce30f8f1ab531c7df07687ee235f0ddb4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f697dc60a7e0406628fa588557f43ce30f8f1ab531c7df07687ee235f0ddb4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f697dc60a7e0406628fa588557f43ce30f8f1ab531c7df07687ee235f0ddb4e", kill_on_drop: false }`
[INFO] [stdout] 8f697dc60a7e0406628fa588557f43ce30f8f1ab531c7df07687ee235f0ddb4e
[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" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 519291e897d5ca07b12813fc1c0bd6e720b0929ecf19aab694319170e017e5f7
[INFO] running `Command { std: "docker" "start" "-a" "519291e897d5ca07b12813fc1c0bd6e720b0929ecf19aab694319170e017e5f7", kill_on_drop: false }`
[INFO] [stderr]     Checking simple-tcp-server-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: enum `TrafficLight` is never used
[INFO] [stdout]  --> src/lesson4.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub enum TrafficLight {
[INFO] [stdout]   |          ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Duration` is never used
[INFO] [stdout]   --> src/lesson4.rs:10:11
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub trait Duration {
[INFO] [stdout]    |           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `TrafficLight` is never used
[INFO] [stdout]  --> src/lesson4.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub enum TrafficLight {
[INFO] [stdout]   |          ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Duration` is never used
[INFO] [stdout]   --> src/lesson4.rs:10:11
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub trait Duration {
[INFO] [stdout]    |           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_numbers` is never used
[INFO] [stdout]   --> src/lesson4.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn sum_numbers(numbers: &[u32]) -> Option<u32> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Sharp` is never used
[INFO] [stdout]   --> src/lesson4.rs:49:11
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub trait Sharp {
[INFO] [stdout]    |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Circle` is never constructed
[INFO] [stdout]   --> src/lesson4.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 | struct Circle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Triangle` is never constructed
[INFO] [stdout]   --> src/lesson4.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 63 | struct Triangle {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Square` is never constructed
[INFO] [stdout]   --> src/lesson4.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 | struct Square {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_sharp_area` is never used
[INFO] [stdout]   --> src/lesson4.rs:83:4
[INFO] [stdout]    |
[INFO] [stdout] 83 | fn print_sharp_area<T: Sharp>(sharp: T) -> f64 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.43s
[INFO] running `Command { std: "docker" "inspect" "519291e897d5ca07b12813fc1c0bd6e720b0929ecf19aab694319170e017e5f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "519291e897d5ca07b12813fc1c0bd6e720b0929ecf19aab694319170e017e5f7", kill_on_drop: false }`
[INFO] [stdout] 519291e897d5ca07b12813fc1c0bd6e720b0929ecf19aab694319170e017e5f7