[INFO] fetching crate remote-canvas 1.0.4...
[INFO] checking remote-canvas-1.0.4 against 1.55.0 for beta-1.56-3
[INFO] extracting crate remote-canvas 1.0.4 into /workspace/builds/worker-56/source
[INFO] validating manifest of crates.io crate remote-canvas 1.0.4 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate remote-canvas 1.0.4
[INFO] finished tweaking crates.io crate remote-canvas 1.0.4
[INFO] tweaked toml for crates.io crate remote-canvas 1.0.4 written to /workspace/builds/worker-56/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
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[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stdout] 2d64c96dd45e0960a6de76507f2b3a79f4899d07237d3cdbccf462fb5de71023
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[INFO] running `Command { std: "docker" "inspect" "2d64c96dd45e0960a6de76507f2b3a79f4899d07237d3cdbccf462fb5de71023", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d64c96dd45e0960a6de76507f2b3a79f4899d07237d3cdbccf462fb5de71023", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9a4272acd9d4f4cc78c6c3c8ee5a04eb867fdf03dc75fa17413cf46acdc2d5d6
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[INFO] [stdout] error[E0412]: cannot find type `Sender` in module `sync`
[INFO] [stdout]   --> src/canvas.rs:10:30
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub(crate) sender: sync::Sender<mpsc::Receiver<WSMessage>>,
[INFO] [stdout]    |                              ^^^^^^ not found in `sync`
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]    |
[INFO] [stdout] 1  | use async_std::channel::Sender;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use crate::mpsc::Sender;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use std::sync::mpsc::Sender;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use tokio::sync::broadcast::Sender;
[INFO] [stdout]    |
[INFO] [stdout]      and 3 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `channel` in module `sync`
[INFO] [stdout]    --> src/canvas.rs:267:40
[INFO] [stdout]     |
[INFO] [stdout] 267 |         let (sender, receiver) = sync::channel::<WsMessageResponse>(1);
[INFO] [stdout]     |                                        ^^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::channel;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::sync::mpsc::channel;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use tokio::sync::broadcast::channel;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use tokio::sync::mpsc::channel;
[INFO] [stdout]     |
[INFO] [stdout]       and 2 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Sender` in module `sync`
[INFO] [stdout]    --> src/websocket.rs:302:32
[INFO] [stdout]     |
[INFO] [stdout] 302 |     pub response: Option<sync::Sender<WsMessageResponse>>,
[INFO] [stdout]     |                                ^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use async_std::channel::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::sync::mpsc::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use tokio::sync::broadcast::Sender;
[INFO] [stdout]     |
[INFO] [stdout]       and 3 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Receiver` in module `sync`
[INFO] [stdout]    --> src/websocket.rs:321:25
[INFO] [stdout]     |
[INFO] [stdout] 321 |     mut receiver: sync::Receiver<mpsc::Receiver<WSMessage>>,
[INFO] [stdout]     |                         ^^^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use async_std::channel::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use core::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout]       and 5 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Sender` in module `sync`
[INFO] [stdout]    --> src/websocket.rs:327:46
[INFO] [stdout]     |
[INFO] [stdout] 327 |     let mut living_jobs: HashMap<Uuid, sync::Sender<WsMessageResponse>> = HashMap::new();
[INFO] [stdout]     |                                              ^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use async_std::channel::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::sync::mpsc::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use tokio::sync::broadcast::Sender;
[INFO] [stdout]     |
[INFO] [stdout]       and 3 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Receiver` in module `sync`
[INFO] [stdout]    --> src/websocket.rs:375:21
[INFO] [stdout]     |
[INFO] [stdout] 375 |     receiver: sync::Receiver<mpsc::Receiver<WSMessage>>,
[INFO] [stdout]     |                     ^^^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use async_std::channel::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use core::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout]       and 5 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Receiver` in module `sync`
[INFO] [stdout]    --> src/websocket.rs:389:21
[INFO] [stdout]     |
[INFO] [stdout] 389 |     receiver: sync::Receiver<mpsc::Receiver<WSMessage>>,
[INFO] [stdout]     |                     ^^^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use async_std::channel::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use core::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout]       and 5 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `channel` in module `sync`
[INFO] [stdout]   --> src/lib.rs:18:36
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let (sender, receiver) = sync::channel::<mpsc::Receiver<WSMessage>>(1024);
[INFO] [stdout]    |                                    ^^^^^^^ not found in `sync`
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::mpsc::channel;
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::sync::mpsc::channel;
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tokio::sync::broadcast::channel;
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tokio::sync::mpsc::channel;
[INFO] [stdout]    |
[INFO] [stdout]      and 2 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Sender` in module `sync`
[INFO] [stdout]   --> src/canvas.rs:10:30
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub(crate) sender: sync::Sender<mpsc::Receiver<WSMessage>>,
[INFO] [stdout]    |                              ^^^^^^ not found in `sync`
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]    |
[INFO] [stdout] 1  | use async_std::channel::Sender;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use crate::mpsc::Sender;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use std::sync::mpsc::Sender;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use tokio::sync::broadcast::Sender;
[INFO] [stdout]    |
[INFO] [stdout]      and 3 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `channel` in module `sync`
[INFO] [stdout]    --> src/canvas.rs:267:40
[INFO] [stdout]     |
[INFO] [stdout] 267 |         let (sender, receiver) = sync::channel::<WsMessageResponse>(1);
[INFO] [stdout]     |                                        ^^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::channel;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::sync::mpsc::channel;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use tokio::sync::broadcast::channel;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use tokio::sync::mpsc::channel;
[INFO] [stdout]     |
[INFO] [stdout]       and 2 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Sender` in module `sync`
[INFO] [stdout]    --> src/websocket.rs:302:32
[INFO] [stdout]     |
[INFO] [stdout] 302 |     pub response: Option<sync::Sender<WsMessageResponse>>,
[INFO] [stdout]     |                                ^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use async_std::channel::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::sync::mpsc::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use tokio::sync::broadcast::Sender;
[INFO] [stdout]     |
[INFO] [stdout]       and 3 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Receiver` in module `sync`
[INFO] [stdout]    --> src/websocket.rs:321:25
[INFO] [stdout]     |
[INFO] [stdout] 321 |     mut receiver: sync::Receiver<mpsc::Receiver<WSMessage>>,
[INFO] [stdout]     |                         ^^^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use async_std::channel::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use core::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout]       and 5 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Sender` in module `sync`
[INFO] [stdout]    --> src/websocket.rs:327:46
[INFO] [stdout]     |
[INFO] [stdout] 327 |     let mut living_jobs: HashMap<Uuid, sync::Sender<WsMessageResponse>> = HashMap::new();
[INFO] [stdout]     |                                              ^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use async_std::channel::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::sync::mpsc::Sender;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use tokio::sync::broadcast::Sender;
[INFO] [stdout]     |
[INFO] [stdout]       and 3 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Receiver` in module `sync`
[INFO] [stdout]    --> src/websocket.rs:375:21
[INFO] [stdout]     |
[INFO] [stdout] 375 |     receiver: sync::Receiver<mpsc::Receiver<WSMessage>>,
[INFO] [stdout]     |                     ^^^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use async_std::channel::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use core::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout]       and 5 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Receiver` in module `sync`
[INFO] [stdout]    --> src/websocket.rs:389:21
[INFO] [stdout]     |
[INFO] [stdout] 389 |     receiver: sync::Receiver<mpsc::Receiver<WSMessage>>,
[INFO] [stdout]     |                     ^^^^^^^^ not found in `sync`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 1   | use async_std::channel::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use core::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::mpsc::Receiver;
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::ops::Receiver;
[INFO] [stdout]     |
[INFO] [stdout]       and 5 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `channel` in module `sync`
[INFO] [stdout]   --> src/lib.rs:18:36
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let (sender, receiver) = sync::channel::<mpsc::Receiver<WSMessage>>(1024);
[INFO] [stdout]    |                                    ^^^^^^^ not found in `sync`
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::mpsc::channel;
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::sync::mpsc::channel;
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tokio::sync::broadcast::channel;
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tokio::sync::mpsc::channel;
[INFO] [stdout]    |
[INFO] [stdout]      and 2 other candidates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0698]: type inside `async fn` body must be known in this context
[INFO] [stdout]     --> src/canvas.rs:1142:23
[INFO] [stdout]      |
[INFO] [stdout] 1142 |             response: None,
[INFO] [stdout]      |                       ^^^^ cannot infer type for type parameter `T` declared on the enum `Option`
[INFO] [stdout]      |
[INFO] [stdout] note: the type is part of the `async fn` body because of this `await`
[INFO] [stdout]     --> src/canvas.rs:1138:5
[INFO] [stdout]      |
[INFO] [stdout] 1138 | /     sender
[INFO] [stdout] 1139 | |         .send(WSMessage {
[INFO] [stdout] 1140 | |             context,
[INFO] [stdout] 1141 | |             data,
[INFO] [stdout] 1142 | |             response: None,
[INFO] [stdout] 1143 | |         })
[INFO] [stdout] 1144 | |         .await
[INFO] [stdout]      | |______________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0698]: type inside `async fn` body must be known in this context
[INFO] [stdout]     --> src/canvas.rs:1142:23
[INFO] [stdout]      |
[INFO] [stdout] 1142 |             response: None,
[INFO] [stdout]      |                       ^^^^ cannot infer type for type parameter `T` declared on the enum `Option`
[INFO] [stdout]      |
[INFO] [stdout] note: the type is part of the `async fn` body because of this `await`
[INFO] [stdout]     --> src/canvas.rs:1138:5
[INFO] [stdout]      |
[INFO] [stdout] 1138 | /     sender
[INFO] [stdout] 1139 | |         .send(WSMessage {
[INFO] [stdout] 1140 | |             context,
[INFO] [stdout] 1141 | |             data,
[INFO] [stdout] 1142 | |             response: None,
[INFO] [stdout] 1143 | |         })
[INFO] [stdout] 1144 | |         .await
[INFO] [stdout]      | |______________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 9 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0425, E0698.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `remote-canvas` due to 10 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 9 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0425, E0698.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9a4272acd9d4f4cc78c6c3c8ee5a04eb867fdf03dc75fa17413cf46acdc2d5d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a4272acd9d4f4cc78c6c3c8ee5a04eb867fdf03dc75fa17413cf46acdc2d5d6", kill_on_drop: false }`
[INFO] [stdout] 9a4272acd9d4f4cc78c6c3c8ee5a04eb867fdf03dc75fa17413cf46acdc2d5d6
