[INFO] fetching crate crossbeam-channel 0.4.4...
[INFO] checking crossbeam-channel-0.4.4 against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] extracting crate crossbeam-channel 0.4.4 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate crossbeam-channel 0.4.4 on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate crossbeam-channel 0.4.4
[INFO] finished tweaking crates.io crate crossbeam-channel 0.4.4
[INFO] tweaked toml for crates.io crate crossbeam-channel 0.4.4 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate crossbeam-channel 0.4.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c3fb716d1ae7534d785855619ac26256ac20ac78d1ab4028993b4e323ad8c91c
[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" "c3fb716d1ae7534d785855619ac26256ac20ac78d1ab4028993b4e323ad8c91c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c3fb716d1ae7534d785855619ac26256ac20ac78d1ab4028993b4e323ad8c91c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3fb716d1ae7534d785855619ac26256ac20ac78d1ab4028993b4e323ad8c91c", kill_on_drop: false }`
[INFO] [stdout] c3fb716d1ae7534d785855619ac26256ac20ac78d1ab4028993b4e323ad8c91c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cc87e6b9c3f957b08c615dcf9603cb03b1e2da2bff400bdce00ba9cdfaaedb6f
[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" "cc87e6b9c3f957b08c615dcf9603cb03b1e2da2bff400bdce00ba9cdfaaedb6f", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking signal-hook-registry v1.2.1
[INFO] [stderr]     Checking crossbeam-utils v0.7.2
[INFO] [stderr]     Checking signal-hook v0.1.16
[INFO] [stderr]     Checking crossbeam-channel v0.4.4 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[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: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.50s
[INFO] running `Command { std: "docker" "inspect" "cc87e6b9c3f957b08c615dcf9603cb03b1e2da2bff400bdce00ba9cdfaaedb6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc87e6b9c3f957b08c615dcf9603cb03b1e2da2bff400bdce00ba9cdfaaedb6f", kill_on_drop: false }`
[INFO] [stdout] cc87e6b9c3f957b08c615dcf9603cb03b1e2da2bff400bdce00ba9cdfaaedb6f