[INFO] fetching crate flume 0.10.11...
[INFO] testing flume-0.10.11 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate flume 0.10.11 into /workspace/builds/worker-100/source
[INFO] validating manifest of crates.io crate flume 0.10.11 on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flume 0.10.11
[INFO] finished tweaking crates.io crate flume 0.10.11
[INFO] tweaked toml for crates.io crate flume 0.10.11 written to /workspace/builds/worker-100/source/Cargo.toml
[INFO] crate crates.io crate flume 0.10.11 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded polling v2.0.3
[INFO] [stderr]   Downloaded async-io v1.4.1
[INFO] [stderr]   Downloaded async-process v1.1.0
[INFO] [stderr]   Downloaded signal-hook v0.3.9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 01f3c041b7135c8c24d96124745062db2bb6ff287b97c9cfdc5e8c9039534bdc
[INFO] running `Command { std: "docker" "start" "-a" "01f3c041b7135c8c24d96124745062db2bb6ff287b97c9cfdc5e8c9039534bdc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "01f3c041b7135c8c24d96124745062db2bb6ff287b97c9cfdc5e8c9039534bdc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01f3c041b7135c8c24d96124745062db2bb6ff287b97c9cfdc5e8c9039534bdc", kill_on_drop: false }`
[INFO] [stdout] 01f3c041b7135c8c24d96124745062db2bb6ff287b97c9cfdc5e8c9039534bdc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 25cdd5a3b4c28e771b873869fcacffceb0b8c69b66ea88e0c8641e2d3fc9ba2d
[INFO] running `Command { std: "docker" "start" "-a" "25cdd5a3b4c28e771b873869fcacffceb0b8c69b66ea88e0c8641e2d3fc9ba2d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling libc v0.2.96
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling futures-core v0.3.15
[INFO] [stderr]    Compiling futures-sink v0.3.15
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling spin v0.9.2
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling nanorand v0.6.1
[INFO] [stderr]    Compiling pin-project-internal v1.0.7
[INFO] [stderr]    Compiling pin-project v1.0.7
[INFO] [stderr]    Compiling flume v0.10.11 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `MutexGuard as SpinlockGuard`
[INFO] [stdout]   --> src/lib.rs:50:32
[INFO] [stdout]    |
[INFO] [stdout] 50 | use spin1::{Mutex as Spinlock, MutexGuard as SpinlockGuard};
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.82s
[INFO] running `Command { std: "docker" "inspect" "25cdd5a3b4c28e771b873869fcacffceb0b8c69b66ea88e0c8641e2d3fc9ba2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25cdd5a3b4c28e771b873869fcacffceb0b8c69b66ea88e0c8641e2d3fc9ba2d", kill_on_drop: false }`
[INFO] [stdout] 25cdd5a3b4c28e771b873869fcacffceb0b8c69b66ea88e0c8641e2d3fc9ba2d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8c083d0acec8dd7272cfaa0c8b025da2f969e6bc47b886ad13327934dc69c81d
[INFO] running `Command { std: "docker" "start" "-a" "8c083d0acec8dd7272cfaa0c8b025da2f969e6bc47b886ad13327934dc69c81d", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.6
[INFO] [stderr]    Compiling futures-io v0.3.15
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling slab v0.4.3
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling cache-padded v1.1.1
[INFO] [stderr]    Compiling parking v2.0.0
[INFO] [stderr]    Compiling fastrand v1.4.1
[INFO] [stderr]    Compiling event-listener v2.5.1
[INFO] [stderr]    Compiling waker-fn v1.1.0
[INFO] [stderr]    Compiling once_cell v1.7.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling futures-task v0.3.15
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling futures-channel v0.3.15
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling signal-hook v0.3.9
[INFO] [stderr]    Compiling async-task v4.0.3
[INFO] [stderr]    Compiling regex-automata v0.1.10
[INFO] [stderr]    Compiling atomic-waker v1.0.0
[INFO] [stderr]    Compiling plotters-backend v0.3.0
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling half v1.7.1
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling oorandom v11.1.3
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling socket2 v0.4.0
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling ctor v0.1.20
[INFO] [stderr]    Compiling rand_core v0.6.2
[INFO] [stderr]    Compiling async-attributes v1.1.2
[INFO] [stderr]    Compiling tokio-macros v1.7.0
[INFO] [stderr]    Compiling cast v0.2.6
[INFO] [stdout] warning: unused import: `MutexGuard as SpinlockGuard`
[INFO] [stdout]   --> src/lib.rs:50:32
[INFO] [stdout]    |
[INFO] [stdout] 50 | use spin1::{Mutex as Spinlock, MutexGuard as SpinlockGuard};
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling concurrent-queue v1.2.2
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling itertools v0.10.1
[INFO] [stderr]    Compiling plotters-svg v0.3.0
[INFO] [stderr]    Compiling async-channel v1.6.1
[INFO] [stderr]    Compiling async-mutex v1.4.0
[INFO] [stderr]    Compiling async-lock v2.4.0
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling futures-macro v0.3.15
[INFO] [stderr]    Compiling futures-util v0.3.15
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling value-bag v1.0.0-alpha.7
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stderr]    Compiling criterion-plot v0.4.3
[INFO] [stderr]    Compiling crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling futures-lite v1.12.0
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling tokio v1.16.1
[INFO] [stderr]    Compiling polling v2.0.3
[INFO] [stderr]    Compiling kv-log-macro v1.0.7
[INFO] [stderr]    Compiling crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling blocking v1.0.2
[INFO] [stderr]    Compiling async-executor v1.4.1
[INFO] [stderr]    Compiling async-io v1.4.1
[INFO] [stderr]    Compiling async-process v1.1.0
[INFO] [stderr]    Compiling async-global-executor v2.0.2
[INFO] [stderr]    Compiling async-std v1.9.0
[INFO] [stderr]    Compiling plotters v0.3.1
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling serde_cbor v0.11.1
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling criterion v0.3.4
[INFO] [stderr]    Compiling futures-executor v0.3.15
[INFO] [stderr]    Compiling futures v0.3.15
[INFO] [stderr]    Compiling flume v0.10.11 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `RecvError`
[INFO] [stdout]   --> tests/zero.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 | use flume::{RecvError, RecvTimeoutError, TryRecvError};
[INFO] [stdout]    |             ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1689:34
[INFO] [stdout]      |
[INFO] [stdout] 1689 |             _bar = rx2.recv() => { panic!() }
[INFO] [stdout]      |                                  ^^        ^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1689 -             _bar = rx2.recv() => { panic!() }
[INFO] [stdout] 1689 +             _bar = rx2.recv() => panic!()
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1693:34
[INFO] [stdout]      |
[INFO] [stdout] 1693 |             _foo = rx1.recv() => { panic!() },
[INFO] [stdout]      |                                  ^^        ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1693 -             _foo = rx1.recv() => { panic!() },
[INFO] [stdout] 1693 +             _foo = rx1.recv() => panic!(),
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1694:33
[INFO] [stdout]      |
[INFO] [stdout] 1694 |             bar = rx2.recv() => { assert_eq!(bar.unwrap(), 2) }
[INFO] [stdout]      |                                 ^^                           ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1694 -             bar = rx2.recv() => { assert_eq!(bar.unwrap(), 2) }
[INFO] [stdout] 1694 +             bar = rx2.recv() => assert_eq!(bar.unwrap(), 2)
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1699:34
[INFO] [stdout]      |
[INFO] [stdout] 1699 |             _bar = rx2.recv() => { panic!() }
[INFO] [stdout]      |                                  ^^        ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1699 -             _bar = rx2.recv() => { panic!() }
[INFO] [stdout] 1699 +             _bar = rx2.recv() => panic!()
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1716:34
[INFO] [stdout]      |
[INFO] [stdout] 1716 |             _foo = rx1.recv() => { panic!("1") },
[INFO] [stdout]      |                                  ^^           ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1716 -             _foo = rx1.recv() => { panic!("1") },
[INFO] [stdout] 1716 +             _foo = rx1.recv() => panic!("1"),
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1717:34
[INFO] [stdout]      |
[INFO] [stdout] 1717 |             _foo = rx2.recv() => { panic!("2") },
[INFO] [stdout]      |                                  ^^           ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1717 -             _foo = rx2.recv() => { panic!("2") },
[INFO] [stdout] 1717 +             _foo = rx2.recv() => panic!("2"),
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1718:34
[INFO] [stdout]      |
[INFO] [stdout] 1718 |             _foo = rx3.recv() => { panic!("3") },
[INFO] [stdout]      |                                  ^^           ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1718 -             _foo = rx3.recv() => { panic!("3") },
[INFO] [stdout] 1718 +             _foo = rx3.recv() => panic!("3"),
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1719:34
[INFO] [stdout]      |
[INFO] [stdout] 1719 |             _foo = rx4.recv() => { panic!("4") },
[INFO] [stdout]      |                                  ^^           ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1719 -             _foo = rx4.recv() => { panic!("4") },
[INFO] [stdout] 1719 +             _foo = rx4.recv() => panic!("4"),
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1731:33
[INFO] [stdout]      |
[INFO] [stdout] 1731 |             _a1 = rx1.recv() => { panic!() },
[INFO] [stdout]      |                                 ^^        ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1731 -             _a1 = rx1.recv() => { panic!() },
[INFO] [stdout] 1731 +             _a1 = rx1.recv() => panic!(),
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1755:32
[INFO] [stdout]      |
[INFO] [stdout] 1755 |             _b = rx2.recv() => { panic!() }
[INFO] [stdout]      |                                ^^        ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1755 -             _b = rx2.recv() => { panic!() }
[INFO] [stdout] 1755 +             _b = rx2.recv() => panic!()
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1759:31
[INFO] [stdout]      |
[INFO] [stdout] 1759 |             a = rx1.recv() => { assert!(a.is_err()) },
[INFO] [stdout]      |                               ^^                   ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1759 -             a = rx1.recv() => { assert!(a.is_err()) },
[INFO] [stdout] 1759 +             a = rx1.recv() => assert!(a.is_err()),
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> tests/mpsc.rs:1760:32
[INFO] [stdout]      |
[INFO] [stdout] 1760 |             _b = rx2.recv() => { panic!() }
[INFO] [stdout]      |                                ^^        ^^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout] 1760 -             _b = rx2.recv() => { panic!() }
[INFO] [stdout] 1760 +             _b = rx2.recv() => panic!()
[INFO] [stdout]      | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `RecvError`
[INFO] [stdout]   --> tests/array.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 | use flume::{RecvError, RecvTimeoutError, TryRecvError};
[INFO] [stdout]    |             ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]    --> tests/stream.rs:248:24
[INFO] [stdout]     |
[INFO] [stdout] 248 |             .for_each(|item| async move {});
[INFO] [stdout]     |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `RecvError`
[INFO] [stdout]   --> tests/list.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 | use flume::{RecvError, RecvTimeoutError, TryRecvError};
[INFO] [stdout]    |             ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `MutexGuard as SpinlockGuard`
[INFO] [stdout]   --> src/lib.rs:50:32
[INFO] [stdout]    |
[INFO] [stdout] 50 | use spin1::{Mutex as Spinlock, MutexGuard as SpinlockGuard};
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> tests/stream.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |         tx.send(42);
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `flume`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name async --edition=2018 tests/async.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --test --cfg 'feature="async"' --cfg 'feature="default"' --cfg 'feature="eventual-fairness"' --cfg 'feature="futures-core"' --cfg 'feature="futures-sink"' --cfg 'feature="nanorand"' --cfg 'feature="pin-project"' --cfg 'feature="select"' -C metadata=e4bca7cdb52b877a -C extra-filename=-e4bca7cdb52b877a --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern async_std=/opt/rustwide/target/debug/deps/libasync_std-2d21a10da789072f.rlib --extern criterion=/opt/rustwide/target/debug/deps/libcriterion-10ae12af8ddc6481.rlib --extern crossbeam_channel=/opt/rustwide/target/debug/deps/libcrossbeam_channel-c93230d2c8eb1bc7.rlib --extern crossbeam_utils=/opt/rustwide/target/debug/deps/libcrossbeam_utils-c079f7c57dd512a6.rlib --extern flume=/opt/rustwide/target/debug/deps/libflume-d638ceaf6c3f658d.rlib --extern futures=/opt/rustwide/target/debug/deps/libfutures-853b9904c1d28d80.rlib --extern futures_core=/opt/rustwide/target/debug/deps/libfutures_core-ec8780e8a2a1f907.rlib --extern futures_sink=/opt/rustwide/target/debug/deps/libfutures_sink-fcdf50aa4799c5e8.rlib --extern nanorand=/opt/rustwide/target/debug/deps/libnanorand-1c277107b71a7f05.rlib --extern pin_project=/opt/rustwide/target/debug/deps/libpin_project-b355bdce68170f44.rlib --extern rand=/opt/rustwide/target/debug/deps/librand-c5a2073741be6952.rlib --extern spin1=/opt/rustwide/target/debug/deps/libspin-2773b3c6678ba95e.rlib --extern tokio=/opt/rustwide/target/debug/deps/libtokio-8c0a3c7a0608c46b.rlib --extern waker_fn=/opt/rustwide/target/debug/deps/libwaker_fn-d84763990f78330e.rlib --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "8c083d0acec8dd7272cfaa0c8b025da2f969e6bc47b886ad13327934dc69c81d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c083d0acec8dd7272cfaa0c8b025da2f969e6bc47b886ad13327934dc69c81d", kill_on_drop: false }`
[INFO] [stdout] 8c083d0acec8dd7272cfaa0c8b025da2f969e6bc47b886ad13327934dc69c81d