[INFO] fetching crate engine_io_server 0.1.0...
[INFO] checking engine_io_server-0.1.0 against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] extracting crate engine_io_server 0.1.0 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate engine_io_server 0.1.0 on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate engine_io_server 0.1.0
[INFO] finished tweaking crates.io crate engine_io_server 0.1.0
[INFO] tweaked toml for crates.io crate engine_io_server 0.1.0 written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 27a4242a8705c1d6b22ed8566a78ce117000075336630f0c3d76648f8bae07e9
[INFO] running `Command { std: "docker" "start" "-a" "27a4242a8705c1d6b22ed8566a78ce117000075336630f0c3d76648f8bae07e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "27a4242a8705c1d6b22ed8566a78ce117000075336630f0c3d76648f8bae07e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27a4242a8705c1d6b22ed8566a78ce117000075336630f0c3d76648f8bae07e9", kill_on_drop: false }`
[INFO] [stdout] 27a4242a8705c1d6b22ed8566a78ce117000075336630f0c3d76648f8bae07e9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7a0ca8f56d2848039b1c12d92dac2e0f4949ecd4a0f4b0c041755a200008705a
[INFO] running `Command { std: "docker" "start" "-a" "7a0ca8f56d2848039b1c12d92dac2e0f4949ecd4a0f4b0c041755a200008705a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling futures-core v0.3.16
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling futures-channel v0.3.16
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling futures-task v0.3.16
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]     Checking slab v0.4.3
[INFO] [stderr]     Checking futures-sink v0.3.16
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking futures-io v0.3.16
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]     Checking bytes v0.5.6
[INFO] [stderr]    Compiling async-trait v0.1.50
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking pin-project-lite v0.1.12
[INFO] [stderr]     Checking strum v0.18.0
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]     Checking tokio v0.2.25
[INFO] [stderr]    Compiling futures-macro v0.3.16
[INFO] [stderr]    Compiling futures-util v0.3.16
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking engine_io_parser v0.2.0
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling strum_macros v0.18.0
[INFO] [stderr]     Checking futures-executor v0.3.16
[INFO] [stderr]     Checking futures v0.3.16
[INFO] [stderr]     Checking serde_json v1.0.64
[INFO] [stderr]     Checking engine_io_server v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `reason`
[INFO] [stdout]    --> src/socket.rs:363:34
[INFO] [stdout]     |
[INFO] [stdout] 363 |     async fn on_close(&mut self, reason: SocketError, description: &str) {
[INFO] [stdout]     |                                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_reason`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `description`
[INFO] [stdout]    --> src/socket.rs:363:55
[INFO] [stdout]     |
[INFO] [stdout] 363 |     async fn on_close(&mut self, reason: SocketError, description: &str) {
[INFO] [stdout]     |                                                       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_description`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/socket.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 |         let mut holder = TransportHolder {
[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: unused variable: `reason`
[INFO] [stdout]    --> src/socket.rs:363:34
[INFO] [stdout]     |
[INFO] [stdout] 363 |     async fn on_close(&mut self, reason: SocketError, description: &str) {
[INFO] [stdout]     |                                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_reason`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `description`
[INFO] [stdout]    --> src/socket.rs:363:55
[INFO] [stdout]     |
[INFO] [stdout] 363 |     async fn on_close(&mut self, reason: SocketError, description: &str) {
[INFO] [stdout]     |                                                       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_description`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `remote_address`
[INFO] [stdout]   --> src/socket.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     remote_address: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `transport_event_sender`
[INFO] [stdout]   --> src/socket.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     transport_event_sender: mpsc::Sender<TransportEvent>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/socket.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 |         let mut holder = TransportHolder {
[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: unused `Result` that must be used
[INFO] [stdout]    --> src/socket.rs:172:9
[INFO] [stdout]     |
[INFO] [stdout] 172 | /         self.event_sender
[INFO] [stdout] 173 | |             .send(SocketEvent::Open {
[INFO] [stdout] 174 | |                 socket_id: self.id.clone(),
[INFO] [stdout] 175 | |             })
[INFO] [stdout] 176 | |             .await;
[INFO] [stdout]     | |___________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `TransportImpl::close` that must be used
[INFO] [stdout]    --> src/socket.rs:187:17
[INFO] [stdout]     |
[INFO] [stdout] 187 |                 self.transport_holder.transport.close();
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/socket.rs:284:13
[INFO] [stdout]     |
[INFO] [stdout] 284 | /             self.event_sender
[INFO] [stdout] 285 | |                 .send(SocketEvent::Flush {
[INFO] [stdout] 286 | |                     socket_id: id.clone(),
[INFO] [stdout] 287 | |                 })
[INFO] [stdout] 288 | |                 .await;
[INFO] [stdout]     | |_______________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `remote_address`
[INFO] [stdout]   --> src/socket.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     remote_address: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `transport_event_sender`
[INFO] [stdout]   --> src/socket.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     transport_event_sender: mpsc::Sender<TransportEvent>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/socket.rs:172:9
[INFO] [stdout]     |
[INFO] [stdout] 172 | /         self.event_sender
[INFO] [stdout] 173 | |             .send(SocketEvent::Open {
[INFO] [stdout] 174 | |                 socket_id: self.id.clone(),
[INFO] [stdout] 175 | |             })
[INFO] [stdout] 176 | |             .await;
[INFO] [stdout]     | |___________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `TransportImpl::close` that must be used
[INFO] [stdout]    --> src/socket.rs:187:17
[INFO] [stdout]     |
[INFO] [stdout] 187 |                 self.transport_holder.transport.close();
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/socket.rs:284:13
[INFO] [stdout]     |
[INFO] [stdout] 284 | /             self.event_sender
[INFO] [stdout] 285 | |                 .send(SocketEvent::Flush {
[INFO] [stdout] 286 | |                     socket_id: id.clone(),
[INFO] [stdout] 287 | |                 })
[INFO] [stdout] 288 | |                 .await;
[INFO] [stdout]     | |_______________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.40s
[INFO] running `Command { std: "docker" "inspect" "7a0ca8f56d2848039b1c12d92dac2e0f4949ecd4a0f4b0c041755a200008705a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a0ca8f56d2848039b1c12d92dac2e0f4949ecd4a0f4b0c041755a200008705a", kill_on_drop: false }`
[INFO] [stdout] 7a0ca8f56d2848039b1c12d92dac2e0f4949ecd4a0f4b0c041755a200008705a