[INFO] cloning repository https://github.com/zesterer/flume
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zesterer/flume" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzesterer%2Fflume", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzesterer%2Fflume'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2882dffa7236aa1483f11c7b1db970a8d0478064
[INFO] checking zesterer/flume against try#45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4 for pr-83744
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzesterer%2Fflume" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zesterer/flume on toolchain 45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zesterer/flume
[INFO] finished tweaking git repo https://github.com/zesterer/flume
[INFO] tweaked toml for git repo https://github.com/zesterer/flume written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "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" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "fetch" "--locked" "--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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c2e67a99e67e690c2590a546f041359cb88d7ed99d1092afcf9c948af81459d0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c2e67a99e67e690c2590a546f041359cb88d7ed99d1092afcf9c948af81459d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c2e67a99e67e690c2590a546f041359cb88d7ed99d1092afcf9c948af81459d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2e67a99e67e690c2590a546f041359cb88d7ed99d1092afcf9c948af81459d0", kill_on_drop: false }`
[INFO] [stdout] c2e67a99e67e690c2590a546f041359cb88d7ed99d1092afcf9c948af81459d0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9bec21a3efab45bf63bc670d4347498184e3a424d77c48520db5042c31c64168
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "9bec21a3efab45bf63bc670d4347498184e3a424d77c48520db5042c31c64168", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling syn v1.0.70
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[INFO] [stderr]    Compiling futures-macro v0.3.14
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[INFO] [stderr]     Checking futures-util v0.3.14
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[INFO] [stderr]     Checking async-io v1.4.0
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[INFO] [stderr]     Checking flume v0.10.4 (/opt/rustwide/workdir)
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[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: `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]      |                                  ^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_braces)]` on by default
[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]      |                                  ^^^^^^^^^^^^ help: remove these braces
[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]      |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[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]      |                                  ^^^^^^^^^^^^ help: remove these braces
[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]      |                                  ^^^^^^^^^^^^^^^ help: remove these braces
[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]      |                                  ^^^^^^^^^^^^^^^ help: remove these braces
[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]      |                                  ^^^^^^^^^^^^^^^ help: remove these braces
[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]      |                                  ^^^^^^^^^^^^^^^ help: remove these braces
[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]      |                                 ^^^^^^^^^^^^ help: remove these braces
[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]      |                                ^^^^^^^^^^^^ help: remove these braces
[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]      |                               ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[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]      |                                ^^^^^^^^^^^^ help: remove these braces
[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: 1 warning emitted
[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] [stdout] warning: 2 warnings 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] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 09s
[INFO] running `Command { std: "docker" "inspect" "9bec21a3efab45bf63bc670d4347498184e3a424d77c48520db5042c31c64168", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9bec21a3efab45bf63bc670d4347498184e3a424d77c48520db5042c31c64168", kill_on_drop: false }`
[INFO] [stdout] 9bec21a3efab45bf63bc670d4347498184e3a424d77c48520db5042c31c64168