[INFO] fetching crate engine_io_server 0.1.0...
[INFO] testing engine_io_server-0.1.0 against 1.69.0 for beta-1.70-1
[INFO] extracting crate engine_io_server 0.1.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate engine_io_server 0.1.0 on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "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-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" __CARGO_TEST_CHANNEL_OVERRIDE_DO_NOT_USE_THIS="nightly" "/workspace/cargo-home/bin/cargo" "+1.69.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded strum v0.18.0
[INFO] [stderr]   Downloaded strum_macros v0.18.0
[INFO] [stderr]   Downloaded engine_io_parser v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 215a1779c2344baa9550f21f4e7758bca49dd70dace63a56baa328b31ae38663
[INFO] running `Command { std: "docker" "start" "-a" "215a1779c2344baa9550f21f4e7758bca49dd70dace63a56baa328b31ae38663", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "215a1779c2344baa9550f21f4e7758bca49dd70dace63a56baa328b31ae38663", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "215a1779c2344baa9550f21f4e7758bca49dd70dace63a56baa328b31ae38663", kill_on_drop: false }`
[INFO] [stdout] 215a1779c2344baa9550f21f4e7758bca49dd70dace63a56baa328b31ae38663
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8d0320b58016c11ceeee2e2fe87a4df7eb75ad890c52a7c7b29b97671c62cc4b
[INFO] running `Command { std: "docker" "start" "-a" "8d0320b58016c11ceeee2e2fe87a4df7eb75ad890c52a7c7b29b97671c62cc4b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.56
[INFO] [stderr]    Compiling quote v1.0.26
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling ryu v1.0.13
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]    Compiling libc v0.2.142
[INFO] [stderr]    Compiling serde_derive v1.0.160
[INFO] [stderr]    Compiling futures-sink v0.3.28
[INFO] [stderr]    Compiling slab v0.4.8
[INFO] [stderr]    Compiling nom v5.1.3
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling serde v1.0.160
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling futures-io v0.3.28
[INFO] [stderr]    Compiling pin-project-lite v0.2.9
[INFO] [stderr]    Compiling serde_json v1.0.96
[INFO] [stderr]    Compiling async-trait v0.1.68
[INFO] [stderr]    Compiling unicode-segmentation v1.10.1
[INFO] [stderr]    Compiling bytes v0.5.6
[INFO] [stderr]    Compiling pin-project-lite v0.1.12
[INFO] [stderr]    Compiling base64 v0.12.3
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling itoa v1.0.6
[INFO] [stderr]    Compiling strum v0.18.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling tokio v0.2.25
[INFO] [stderr]    Compiling syn v2.0.15
[INFO] [stderr]    Compiling getrandom v0.2.9
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling strum_macros v0.18.0
[INFO] [stderr]    Compiling engine_io_parser v0.2.0
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]    Compiling futures-executor v0.3.28
[INFO] [stderr]    Compiling futures v0.3.28
[INFO] [stderr]    Compiling 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: field `remote_address` is never read
[INFO] [stdout]   --> src/socket.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct Socket<A: 'static + Adapter> {
[INFO] [stdout]    |            ------ field in this struct
[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 `transport_event_sender` is never read
[INFO] [stdout]   --> src/socket.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct TransportHolder<A: 'static + Adapter> {
[INFO] [stdout]    |        --------------- field in this struct
[INFO] [stdout] 44 |     transport: Transport<A>,
[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: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[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 15.65s
[INFO] running `Command { std: "docker" "inspect" "8d0320b58016c11ceeee2e2fe87a4df7eb75ad890c52a7c7b29b97671c62cc4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d0320b58016c11ceeee2e2fe87a4df7eb75ad890c52a7c7b29b97671c62cc4b", kill_on_drop: false }`
[INFO] [stdout] 8d0320b58016c11ceeee2e2fe87a4df7eb75ad890c52a7c7b29b97671c62cc4b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b24cabf68bd319c6d6e00537d317d727b0db433f2892870c0c1a0d53b192ba9f
[INFO] running `Command { std: "docker" "start" "-a" "b24cabf68bd319c6d6e00537d317d727b0db433f2892870c0c1a0d53b192ba9f", kill_on_drop: false }`
[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: field `remote_address` is never read
[INFO] [stdout]   --> src/socket.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct Socket<A: 'static + Adapter> {
[INFO] [stdout]    |            ------ field in this struct
[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] [stderr]    Compiling engine_io_server v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `transport_event_sender` is never read
[INFO] [stdout]   --> src/socket.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct TransportHolder<A: 'static + Adapter> {
[INFO] [stdout]    |        --------------- field in this struct
[INFO] [stdout] 44 |     transport: Transport<A>,
[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: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[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: 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: field `remote_address` is never read
[INFO] [stdout]   --> src/socket.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct Socket<A: 'static + Adapter> {
[INFO] [stdout]    |            ------ field in this struct
[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 `transport_event_sender` is never read
[INFO] [stdout]   --> src/socket.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct TransportHolder<A: 'static + Adapter> {
[INFO] [stdout]    |        --------------- field in this struct
[INFO] [stdout] 44 |     transport: Transport<A>,
[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: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[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 test [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "b24cabf68bd319c6d6e00537d317d727b0db433f2892870c0c1a0d53b192ba9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b24cabf68bd319c6d6e00537d317d727b0db433f2892870c0c1a0d53b192ba9f", kill_on_drop: false }`
[INFO] [stdout] b24cabf68bd319c6d6e00537d317d727b0db433f2892870c0c1a0d53b192ba9f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 2cff306556c18a5ec3438024921d22fcbffdc2e28a4c47574bdb21a468ab4b2b
[INFO] running `Command { std: "docker" "start" "-a" "2cff306556c18a5ec3438024921d22fcbffdc2e28a4c47574bdb21a468ab4b2b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused variable: `reason`
[INFO] [stderr]    --> src/socket.rs:363:34
[INFO] [stderr]     |
[INFO] [stderr] 363 |     async fn on_close(&mut self, reason: SocketError, description: &str) {
[INFO] [stderr]     |                                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_reason`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `description`
[INFO] [stderr]    --> src/socket.rs:363:55
[INFO] [stderr]     |
[INFO] [stderr] 363 |     async fn on_close(&mut self, reason: SocketError, description: &str) {
[INFO] [stderr]     |                                                       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_description`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/socket.rs:55:13
[INFO] [stderr]    |
[INFO] [stderr] 55 |         let mut holder = TransportHolder {
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field `remote_address` is never read
[INFO] [stderr]   --> src/socket.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | pub struct Socket<A: 'static + Adapter> {
[INFO] [stderr]    |            ------ field in this struct
[INFO] [stderr] ...
[INFO] [stderr] 33 |     remote_address: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field `transport_event_sender` is never read
[INFO] [stderr]   --> src/socket.rs:45:5
[INFO] [stderr]    |
[INFO] [stderr] 43 | struct TransportHolder<A: 'static + Adapter> {
[INFO] [stderr]    |        --------------- field in this struct
[INFO] [stderr] 44 |     transport: Transport<A>,
[INFO] [stderr] 45 |     transport_event_sender: mpsc::Sender<TransportEvent>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/socket.rs:172:9
[INFO] [stderr]     |
[INFO] [stderr] 172 | /         self.event_sender
[INFO] [stderr] 173 | |             .send(SocketEvent::Open {
[INFO] [stderr] 174 | |                 socket_id: self.id.clone(),
[INFO] [stderr] 175 | |             })
[INFO] [stderr] 176 | |             .await;
[INFO] [stderr]     | |__________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `TransportImpl::close` that must be used
[INFO] [stderr]    --> src/socket.rs:187:17
[INFO] [stderr]     |
[INFO] [stderr] 187 |                 self.transport_holder.transport.close();
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/socket.rs:284:13
[INFO] [stderr]     |
[INFO] [stderr] 284 | /             self.event_sender
[INFO] [stderr] 285 | |                 .send(SocketEvent::Flush {
[INFO] [stderr] 286 | |                     socket_id: id.clone(),
[INFO] [stderr] 287 | |                 })
[INFO] [stderr] 288 | |                 .await;
[INFO] [stderr]     | |______________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `engine_io_server` (lib) generated 8 warnings (run `cargo fix --lib -p engine_io_server` to apply 3 suggestions)
[INFO] [stderr] warning: `engine_io_server` (lib test) generated 8 warnings (8 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.65s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/engine_io_server-fdf731165325b98e)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests engine_io_server
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "2cff306556c18a5ec3438024921d22fcbffdc2e28a4c47574bdb21a468ab4b2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2cff306556c18a5ec3438024921d22fcbffdc2e28a4c47574bdb21a468ab4b2b", kill_on_drop: false }`
[INFO] [stdout] 2cff306556c18a5ec3438024921d22fcbffdc2e28a4c47574bdb21a468ab4b2b
