[INFO] fetching crate flume 0.8.4...
[INFO] checking flume-0.8.4 against try#72f88fc4e9458f89516a0b8b0868f3718aec5b47 for pr-74989
[INFO] extracting crate flume 0.8.4 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate flume 0.8.4 on toolchain 72f88fc4e9458f89516a0b8b0868f3718aec5b47
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flume 0.8.4
[INFO] finished tweaking crates.io crate flume 0.8.4
[INFO] tweaked toml for crates.io crate flume 0.8.4 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate flume 0.8.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded spinning_top v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d2383c0e8b86fb49c12b777d9b3181b55ce4b0121bf6d4d8278ad36269956341
[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" "d2383c0e8b86fb49c12b777d9b3181b55ce4b0121bf6d4d8278ad36269956341", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2383c0e8b86fb49c12b777d9b3181b55ce4b0121bf6d4d8278ad36269956341", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2383c0e8b86fb49c12b777d9b3181b55ce4b0121bf6d4d8278ad36269956341", kill_on_drop: false }`
[INFO] [stdout] d2383c0e8b86fb49c12b777d9b3181b55ce4b0121bf6d4d8278ad36269956341
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 33e513aca188e914d8a113c7823e8e3059b8df5a624870d1cbfadf1700d92452
[INFO] running `Command { std: "docker" "start" "-a" "33e513aca188e914d8a113c7823e8e3059b8df5a624870d1cbfadf1700d92452", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking futures-task v0.3.4
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]     Checking futures-io v0.3.4
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking regex-syntax v0.6.17
[INFO] [stderr]     Checking oorandom v11.1.0
[INFO] [stderr]     Checking once_cell v1.3.1
[INFO] [stderr]     Checking futures-timer v2.0.2
[INFO] [stderr]     Checking futures-channel v0.3.4
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[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking serde_json v1.0.48
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking spinning_top v0.2.1
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking kv-log-macro v1.0.4
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]    Compiling memoffset v0.5.3
[INFO] [stderr]    Compiling cast v0.2.3
[INFO] [stderr]     Checking bstr v0.2.11
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking num_cpus v1.12.0
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking async-task v1.3.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
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[INFO] [stderr]     Checking rand_core v0.5.1
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[INFO] [stderr]     Checking tinytemplate v1.0.3
[INFO] [stderr]     Checking criterion-plot v0.4.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking regex v1.3.5
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking rayon-core v1.7.0
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking plotters v0.2.12
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]     Checking flume v0.8.4 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]     Checking async-std v1.5.0
[INFO] [stderr]     Checking criterion v0.3.1
[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 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: 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: 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: variable does not need to be mutable
[INFO] [stdout]  --> tests/async.rs:7:14
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let (tx, mut rx) = unbounded();
[INFO] [stdout]   |              ----^^
[INFO] [stdout]   |              |
[INFO] [stdout]   |              help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/async.rs:24:14
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let (tx, mut rx) = bounded(1);
[INFO] [stdout]    |              ----^^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/async.rs:41:14
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let (tx, mut rx) = bounded::<i32>(0);
[INFO] [stdout]    |              ----^^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/async.rs:58:14
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let (tx, mut rx) = bounded(0);
[INFO] [stdout]    |              ----^^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/async.rs:75:14
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let (tx, mut rx) = bounded::<i32>(10);
[INFO] [stdout]    |              ----^^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/async.rs:110:14
[INFO] [stdout]     |
[INFO] [stdout] 110 |     let (tx, mut rx) = unbounded();
[INFO] [stdout]     |              ----^^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[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] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 11s
[INFO] running `Command { std: "docker" "inspect" "33e513aca188e914d8a113c7823e8e3059b8df5a624870d1cbfadf1700d92452", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33e513aca188e914d8a113c7823e8e3059b8df5a624870d1cbfadf1700d92452", kill_on_drop: false }`
[INFO] [stdout] 33e513aca188e914d8a113c7823e8e3059b8df5a624870d1cbfadf1700d92452
