[INFO] cloning repository https://github.com/xero-lib/tcp-chat
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xero-lib/tcp-chat" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxero-lib%2Ftcp-chat", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxero-lib%2Ftcp-chat'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4ceb9da8a259db0ffc2bb644ba9827862701db75
[INFO] checking xero-lib/tcp-chat against master#bca37a20bd376ce3fd138e7cdee7fe704e0f8814 for pr-139493-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxero-lib%2Ftcp-chat" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/xero-lib/tcp-chat
[INFO] finished tweaking git repo https://github.com/xero-lib/tcp-chat
[INFO] tweaked toml for git repo https://github.com/xero-lib/tcp-chat written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/xero-lib/tcp-chat on toolchain bca37a20bd376ce3fd138e7cdee7fe704e0f8814
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/xero-lib/tcp-chat 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" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b4e4234f5b8aa188feb4f0a0944f2bccf2f1a64e88d20c0ceec7e5836095ff0f
[INFO] running `Command { std: "docker" "start" "-a" "b4e4234f5b8aa188feb4f0a0944f2bccf2f1a64e88d20c0ceec7e5836095ff0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b4e4234f5b8aa188feb4f0a0944f2bccf2f1a64e88d20c0ceec7e5836095ff0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4e4234f5b8aa188feb4f0a0944f2bccf2f1a64e88d20c0ceec7e5836095ff0f", kill_on_drop: false }`
[INFO] [stdout] b4e4234f5b8aa188feb4f0a0944f2bccf2f1a64e88d20c0ceec7e5836095ff0f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b4bf9acaec62ad54e7252c7521d13814d420f047539cdfed89f52c5c5c12d849
[INFO] running `Command { std: "docker" "start" "-a" "b4bf9acaec62ad54e7252c7521d13814d420f047539cdfed89f52c5c5c12d849", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]     Checking tracing-core v0.1.18
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling tokio v1.5.0
[INFO] [stderr]     Checking once_cell v1.7.2
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking tracing-log v0.1.2
[INFO] [stderr]     Checking sharded-slab v0.1.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking mio v0.7.11
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]     Checking serde_json v1.0.64
[INFO] [stderr]     Checking tracing-serde v0.1.2
[INFO] [stderr]    Compiling tracing-attributes v0.1.15
[INFO] [stderr]    Compiling tokio-macros v1.1.0
[INFO] [stderr]     Checking tracing v0.1.26
[INFO] [stderr]     Checking tracing-subscriber v0.2.18
[INFO] [stderr]     Checking tcp-chat v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `error`, `trace`, and `warn`
[INFO] [stdout]  --> src/main.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use tracing::{error, info, trace, warn};
[INFO] [stdout]   |               ^^^^^        ^^^^^  ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/main.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use tokio::io::{self, AsyncReadExt, AsyncWriteExt};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `error`, `trace`, and `warn`
[INFO] [stdout]  --> src/main.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use tracing::{error, info, trace, warn};
[INFO] [stdout]   |               ^^^^^        ^^^^^  ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/main.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use tokio::io::{self, AsyncReadExt, AsyncWriteExt};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:37:21
[INFO] [stdout]    |
[INFO] [stdout] 37 |                     write.write_all(msg.as_ref()).await;
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 37 |                     let _ = write.write_all(msg.as_ref()).await;
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:37:21
[INFO] [stdout]    |
[INFO] [stdout] 37 |                     write.write_all(msg.as_ref()).await;
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 37 |                     let _ = write.write_all(msg.as_ref()).await;
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.33s
[INFO] running `Command { std: "docker" "inspect" "b4bf9acaec62ad54e7252c7521d13814d420f047539cdfed89f52c5c5c12d849", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4bf9acaec62ad54e7252c7521d13814d420f047539cdfed89f52c5c5c12d849", kill_on_drop: false }`
[INFO] [stdout] b4bf9acaec62ad54e7252c7521d13814d420f047539cdfed89f52c5c5c12d849