[INFO] fetching crate heng_rs 0.1.0...
[INFO] testing heng_rs-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate heng_rs 0.1.0 into /workspace/builds/worker-37/source
[INFO] validating manifest of crates.io crate heng_rs 0.1.0 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 heng_rs 0.1.0
[INFO] finished tweaking crates.io crate heng_rs 0.1.0
[INFO] tweaked toml for crates.io crate heng_rs 0.1.0 written to /workspace/builds/worker-37/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 }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9fc41b50b5f5dec650553346f398597319836f40b9cf1be9d27940d1c3be93f3
[INFO] running `Command { std: "docker" "start" "-a" "9fc41b50b5f5dec650553346f398597319836f40b9cf1be9d27940d1c3be93f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9fc41b50b5f5dec650553346f398597319836f40b9cf1be9d27940d1c3be93f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9fc41b50b5f5dec650553346f398597319836f40b9cf1be9d27940d1c3be93f3", kill_on_drop: false }`
[INFO] [stdout] 9fc41b50b5f5dec650553346f398597319836f40b9cf1be9d27940d1c3be93f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 91c44412e36fdd6077d6f0825aace36cd16c223016632e80e27d82a9470230f8
[INFO] running `Command { std: "docker" "start" "-a" "91c44412e36fdd6077d6f0825aace36cd16c223016632e80e27d82a9470230f8", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling slab v0.4.4
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling tokio-executor v0.2.0-alpha.6
[INFO] [stderr]    Compiling tokio-sync v0.2.0-alpha.6
[INFO] [stderr]    Compiling tokio-timer v0.3.0-alpha.6
[INFO] [stderr]    Compiling heng_rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `futures_util::SinkExt`
[INFO] [stdout]   --> src/lib.rs:51:20
[INFO] [stdout]    |
[INFO] [stdout] 51 | use futures_util::{SinkExt, StreamExt};
[INFO] [stdout]    |                    ^^^^^^^ no `SinkExt` in the root
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: could not find `current_thread` in `tokio_executor`
[INFO] [stdout]   --> src/lib.rs:83:25
[INFO] [stdout]    |
[INFO] [stdout] 83 |         tokio_executor::current_thread::spawn(async move {
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^ could not find `current_thread` in `tokio_executor`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `send` found for mutable reference `&mut UnboundedSender<M>` in the current scope
[INFO] [stdout]   --> src/lib.rs:76:14
[INFO] [stdout]    |
[INFO] [stdout] 76 |             .send(msg)
[INFO] [stdout]    |              ^^^^ method not found in `&mut UnboundedSender<M>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `send` found for struct `futures_channel::mpsc::Sender` in the current scope
[INFO] [stdout]    --> src/lib.rs:106:22
[INFO] [stdout]     |
[INFO] [stdout] 106 |         inner.tx_sig.send(signal).await
[INFO] [stdout]     |                      ^^^^ method not found in `futures_channel::mpsc::Sender<Signal>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `send` found for mutable reference `&mut UnboundedSender<M>` in the current scope
[INFO] [stdout]   --> src/lib.rs:84:65
[INFO] [stdout]    |
[INFO] [stdout] 84 |             let _ = sender.lock().unwrap().tx.as_mut().unwrap().send(msg).await;
[INFO] [stdout]    |                                                                 ^^^^ method not found in `&mut UnboundedSender<M>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0433, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `heng_rs` due to 6 previous errors
[INFO] running `Command { std: "docker" "inspect" "91c44412e36fdd6077d6f0825aace36cd16c223016632e80e27d82a9470230f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91c44412e36fdd6077d6f0825aace36cd16c223016632e80e27d82a9470230f8", kill_on_drop: false }`
[INFO] [stdout] 91c44412e36fdd6077d6f0825aace36cd16c223016632e80e27d82a9470230f8