[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] checking AmeerIbrahimm/ws-chat-server against try#5fee451ebd94296ea05214e819c311e164b30af6 for pr-139042
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAmeerIbrahimm%2Fws-chat-server" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AmeerIbrahimm/ws-chat-server on toolchain 5fee451ebd94296ea05214e819c311e164b30af6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5fee451ebd94296ea05214e819c311e164b30af6" "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-2-tc2/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" "+5fee451ebd94296ea05214e819c311e164b30af6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+5fee451ebd94296ea05214e819c311e164b30af6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 68a83c68384d8b4fdbbdfcd25dcabf623f933d0cd4196585a5c73f907ad68b9b
[INFO] running `Command { std: "docker" "start" "-a" "68a83c68384d8b4fdbbdfcd25dcabf623f933d0cd4196585a5c73f907ad68b9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "68a83c68384d8b4fdbbdfcd25dcabf623f933d0cd4196585a5c73f907ad68b9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68a83c68384d8b4fdbbdfcd25dcabf623f933d0cd4196585a5c73f907ad68b9b", kill_on_drop: false }`
[INFO] [stdout] 68a83c68384d8b4fdbbdfcd25dcabf623f933d0cd4196585a5c73f907ad68b9b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+5fee451ebd94296ea05214e819c311e164b30af6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8d9b4cef6a5ad9b291bcbfae4938aecbdeaeb7a7ed1e2c027d40fd4e08acf2d2
[INFO] running `Command { std: "docker" "start" "-a" "8d9b4cef6a5ad9b291bcbfae4938aecbdeaeb7a7ed1e2c027d40fd4e08acf2d2", 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 parking_lot_core v0.9.10
[INFO] [stderr]    Compiling anyhow v1.0.85
[INFO] [stderr]    Compiling lock_api v0.4.12
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]     Checking signal-hook-registry v1.4.2
[INFO] [stderr]     Checking socket2 v0.5.7
[INFO] [stderr]     Checking mio v0.8.11
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]    Compiling syn v2.0.63
[INFO] [stderr]     Checking parking_lot v0.12.2
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]     Checking tokio v1.37.0
[INFO] [stderr]     Checking 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] 
[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] 
[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] [stderr] warning: build failed, waiting for other jobs to finish...
[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" test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "8d9b4cef6a5ad9b291bcbfae4938aecbdeaeb7a7ed1e2c027d40fd4e08acf2d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d9b4cef6a5ad9b291bcbfae4938aecbdeaeb7a7ed1e2c027d40fd4e08acf2d2", kill_on_drop: false }`
[INFO] [stdout] 8d9b4cef6a5ad9b291bcbfae4938aecbdeaeb7a7ed1e2c027d40fd4e08acf2d2
