[INFO] fetching crate crossbeam-channel 0.4.2...
[INFO] checking crossbeam-channel-0.4.2 against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] extracting crate crossbeam-channel 0.4.2 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate crossbeam-channel 0.4.2 on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate crossbeam-channel 0.4.2
[INFO] finished tweaking crates.io crate crossbeam-channel 0.4.2
[INFO] tweaked toml for crates.io crate crossbeam-channel 0.4.2 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate crossbeam-channel 0.4.2 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 4b99f6b8b1ec6315e853a637cc138db058c421c70d916cd31e8cc7e3c3e3b050
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "4b99f6b8b1ec6315e853a637cc138db058c421c70d916cd31e8cc7e3c3e3b050"`
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]     Checking arc-swap v0.4.4
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking signal-hook-registry v1.2.0
[INFO] [stderr]     Checking signal-hook v0.1.13
[INFO] [stderr]     Checking crossbeam-channel v0.4.2 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1689:34
[INFO] [stderr]      |
[INFO] [stderr] 1689 |             _bar = rx2.recv() => { panic!() }
[INFO] [stderr]      |                                  ^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_braces)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1693:34
[INFO] [stderr]      |
[INFO] [stderr] 1693 |             _foo = rx1.recv() => { panic!() },
[INFO] [stderr]      |                                  ^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1694:33
[INFO] [stderr]      |
[INFO] [stderr] 1694 |             bar = rx2.recv() => { assert_eq!(bar.unwrap(), 2) }
[INFO] [stderr]      |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1699:34
[INFO] [stderr]      |
[INFO] [stderr] 1699 |             _bar = rx2.recv() => { panic!() }
[INFO] [stderr]      |                                  ^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1716:34
[INFO] [stderr]      |
[INFO] [stderr] 1716 |             _foo = rx1.recv() => { panic!("1") },
[INFO] [stderr]      |                                  ^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1717:34
[INFO] [stderr]      |
[INFO] [stderr] 1717 |             _foo = rx2.recv() => { panic!("2") },
[INFO] [stderr]      |                                  ^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1718:34
[INFO] [stderr]      |
[INFO] [stderr] 1718 |             _foo = rx3.recv() => { panic!("3") },
[INFO] [stderr]      |                                  ^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1719:34
[INFO] [stderr]      |
[INFO] [stderr] 1719 |             _foo = rx4.recv() => { panic!("4") },
[INFO] [stderr]      |                                  ^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1731:33
[INFO] [stderr]      |
[INFO] [stderr] 1731 |             _a1 = rx1.recv() => { panic!() },
[INFO] [stderr]      |                                 ^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1755:32
[INFO] [stderr]      |
[INFO] [stderr] 1755 |             _b = rx2.recv() => { panic!() }
[INFO] [stderr]      |                                ^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1759:31
[INFO] [stderr]      |
[INFO] [stderr] 1759 |             a = rx1.recv() => { assert!(a.is_err()) },
[INFO] [stderr]      |                               ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary braces around block return value
[INFO] [stderr]     --> tests/mpsc.rs:1760:32
[INFO] [stderr]      |
[INFO] [stderr] 1760 |             _b = rx2.recv() => { panic!() }
[INFO] [stderr]      |                                ^^^^^^^^^^^^ help: remove these braces
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.71s
[INFO] running `"docker" "inspect" "4b99f6b8b1ec6315e853a637cc138db058c421c70d916cd31e8cc7e3c3e3b050"`
[INFO] running `"docker" "rm" "-f" "4b99f6b8b1ec6315e853a637cc138db058c421c70d916cd31e8cc7e3c3e3b050"`
[INFO] [stdout] 4b99f6b8b1ec6315e853a637cc138db058c421c70d916cd31e8cc7e3c3e3b050