[INFO] cloning repository https://github.com/AmeerIbrahimm/ws-chat-server
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AmeerIbrahimm/ws-chat-server" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAmeerIbrahimm%2Fws-chat-server", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAmeerIbrahimm%2Fws-chat-server'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 239db177ed6eadace7ad5c2a34808e0098b454ce
[INFO] building AmeerIbrahimm/ws-chat-server against master#ad211ced81509462cdfe4c29ed10f97279a0acae for pr-135216
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAmeerIbrahimm%2Fws-chat-server" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AmeerIbrahimm/ws-chat-server on toolchain ad211ced81509462cdfe4c29ed10f97279a0acae
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/AmeerIbrahimm/ws-chat-server
[INFO] finished tweaking git repo https://github.com/AmeerIbrahimm/ws-chat-server
[INFO] tweaked toml for git repo https://github.com/AmeerIbrahimm/ws-chat-server written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/AmeerIbrahimm/ws-chat-server 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" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded anyhow v1.0.85
[INFO] [stderr]   Downloaded syn v2.0.63
[INFO] [stderr]   Downloaded libc v0.2.154
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 47f4d2ecf423593a02919b714bd5fdbcc9d61cd12cd35538b13612227c561874
[INFO] running `Command { std: "docker" "start" "-a" "47f4d2ecf423593a02919b714bd5fdbcc9d61cd12cd35538b13612227c561874", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "47f4d2ecf423593a02919b714bd5fdbcc9d61cd12cd35538b13612227c561874", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47f4d2ecf423593a02919b714bd5fdbcc9d61cd12cd35538b13612227c561874", kill_on_drop: false }`
[INFO] [stdout] 47f4d2ecf423593a02919b714bd5fdbcc9d61cd12cd35538b13612227c561874
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 76690874e3d5aa81c745ae3564bb8d00723d6e271f7d66c0872a8d8a15c38815
[INFO] running `Command { std: "docker" "start" "-a" "76690874e3d5aa81c745ae3564bb8d00723d6e271f7d66c0872a8d8a15c38815", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.154
[INFO] [stderr]    Compiling proc-macro2 v1.0.82
[INFO] [stderr]    Compiling autocfg v1.3.0
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling scopeguard v1.2.0
[INFO] [stderr]    Compiling smallvec v1.13.2
[INFO] [stderr]    Compiling anyhow v1.0.85
[INFO] [stderr]    Compiling pin-project-lite v0.2.14
[INFO] [stderr]    Compiling bytes v1.6.0
[INFO] [stderr]    Compiling lock_api v0.4.12
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling syn v2.0.63
[INFO] [stderr]    Compiling num_cpus v1.16.0
[INFO] [stderr]    Compiling socket2 v0.5.7
[INFO] [stderr]    Compiling mio v0.8.11
[INFO] [stderr]    Compiling signal-hook-registry v1.4.2
[INFO] [stderr]    Compiling parking_lot v0.12.2
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]    Compiling tokio v1.37.0
[INFO] [stderr]    Compiling ws-chat-server v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0277]: the `?` operator can only be used in an async block that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/main.rs:18:37
[INFO] [stdout]    |
[INFO] [stdout] 16 |     tokio::spawn(async move {
[INFO] [stdout]    |                  ---------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 17 |         for _ in 0..1000 {
[INFO] [stdout] 18 |              tx.send("hello".into())?;
[INFO] [stdout]    |                                     ^ cannot use the `?` operator in an async block that returns `()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<Result<Infallible, tokio::sync::broadcast::error::SendError<String>>>` is not implemented for `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ws-chat-server` (bin "ws-chat-server") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "76690874e3d5aa81c745ae3564bb8d00723d6e271f7d66c0872a8d8a15c38815", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76690874e3d5aa81c745ae3564bb8d00723d6e271f7d66c0872a8d8a15c38815", kill_on_drop: false }`
[INFO] [stdout] 76690874e3d5aa81c745ae3564bb8d00723d6e271f7d66c0872a8d8a15c38815
