[INFO] fetching crate executors 0.8.0...
[INFO] checking executors-0.8.0 against try#b2f80f6008cdafc35b4472bd46afa16cc6b0cd63 for pr-79470
[INFO] extracting crate executors 0.8.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate executors 0.8.0 on toolchain b2f80f6008cdafc35b4472bd46afa16cc6b0cd63
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate executors 0.8.0
[INFO] finished tweaking crates.io crate executors 0.8.0
[INFO] tweaked toml for crates.io crate executors 0.8.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3ebc15d3fb79f42146f0f39745df8ca19557a9cf1c911d7720501f6e7abae5a9
[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" "3ebc15d3fb79f42146f0f39745df8ca19557a9cf1c911d7720501f6e7abae5a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3ebc15d3fb79f42146f0f39745df8ca19557a9cf1c911d7720501f6e7abae5a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ebc15d3fb79f42146f0f39745df8ca19557a9cf1c911d7720501f6e7abae5a9", kill_on_drop: false }`
[INFO] [stdout] 3ebc15d3fb79f42146f0f39745df8ca19557a9cf1c911d7720501f6e7abae5a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ede31384b6bf54e006109b730862408f436380fa3ed076112004bee410fee8dd
[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" "ede31384b6bf54e006109b730862408f436380fa3ed076112004bee410fee8dd", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling pulldown-cmark v0.7.2
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking form_urlencoded v1.0.0
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking log v0.4.11
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking toml v0.5.7
[INFO] [stderr]     Checking tinyvec v1.1.0
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking regex v1.4.2
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]     Checking synchronoise v1.0.0
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling memoffset v0.6.1
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking serde_json v1.0.60
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking quote v1.0.7
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking crossbeam-epoch v0.9.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.0
[INFO] [stderr]     Checking crossbeam-channel v0.4.4
[INFO] [stderr]     Checking syn v1.0.54
[INFO] [stderr]     Checking bstr v0.2.14
[INFO] [stderr]     Checking criterion-plot v0.4.3
[INFO] [stderr]     Checking unicode-normalization v0.1.16
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking crossbeam-deque v0.8.0
[INFO] [stderr]     Checking rayon-core v1.9.0
[INFO] [stderr]     Checking plotters v0.2.15
[INFO] [stderr]     Checking csv v1.1.5
[INFO] [stderr]     Checking tinytemplate v1.1.0
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking url v2.2.0
[INFO] [stderr]     Checking version-sync v0.9.1
[INFO] [stderr]    Compiling pin-project-internal v1.0.2
[INFO] [stderr]    Compiling futures-macro v0.3.8
[INFO] [stderr]    Compiling arr_macro_impl v0.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]     Checking arr_macro v0.1.3
[INFO] [stderr]     Checking executors v0.8.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking pin-project v1.0.2
[INFO] [stderr]     Checking futures-util v0.3.8
[INFO] [stderr]     Checking criterion v0.3.3
[INFO] [stderr]     Checking futures-executor v0.3.8
[INFO] [stderr]     Checking futures v0.3.8
[INFO] [stdout] warning: unused `async_task::task::Task` that must be used
[INFO] [stdout]    --> benches/scheduler.rs:156:17
[INFO] [stdout]     |
[INFO] [stdout] 156 | /                 rt.spawn(async move {
[INFO] [stdout] 157 | |                     iter(rt_new, done_tx, n - 1);
[INFO] [stdout] 158 | |                 });
[INFO] [stdout]     | |___________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: tasks get canceled when dropped, use `.detach()` to run them in the background
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `async_task::task::Task` that must be used
[INFO] [stdout]    --> benches/scheduler.rs:168:17
[INFO] [stdout]     |
[INFO] [stdout] 168 | /                 rt_inner.spawn(async move {
[INFO] [stdout] 169 | |                     iter(rt_new, done_tx, CHAINING_DEPTH);
[INFO] [stdout] 170 | |                 });
[INFO] [stdout]     | |___________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: tasks get canceled when dropped, use `.detach()` to run them in the background
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `async_task::task::Task` that must be used
[INFO] [stdout]    --> benches/scheduler.rs:250:21
[INFO] [stdout]     |
[INFO] [stdout] 250 | /                     rt.spawn(async move {
[INFO] [stdout] 251 | |                         if 1 == rem.fetch_sub(1, Relaxed) {
[INFO] [stdout] 252 | |                             tx.send(()).unwrap();
[INFO] [stdout] 253 | |                         }
[INFO] [stdout] 254 | |                     });
[INFO] [stdout]     | |_______________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: tasks get canceled when dropped, use `.detach()` to run them in the background
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `async_task::task::Task` that must be used
[INFO] [stdout]    --> benches/scheduler.rs:350:13
[INFO] [stdout]     |
[INFO] [stdout] 350 | /             rt.spawn(async move {
[INFO] [stdout] 351 | |                 for _i in 0..PINGS_NUM {
[INFO] [stdout] 352 | |                     let rem = rem.clone();
[INFO] [stdout] 353 | |                     let done_tx = done_tx.clone();
[INFO] [stdout] ...   |
[INFO] [stdout] 375 | |                 }
[INFO] [stdout] 376 | |             });
[INFO] [stdout]     | |_______________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: tasks get canceled when dropped, use `.detach()` to run them in the background
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `async_task::task::Task` that must be used
[INFO] [stdout]    --> benches/scheduler.rs:355:21
[INFO] [stdout]     |
[INFO] [stdout] 355 | /                     rt_new.spawn(async move {
[INFO] [stdout] 356 | |                         let (tx1, rx1) = oneshot::channel();
[INFO] [stdout] 357 | |                         let (tx2, rx2) = oneshot::channel();
[INFO] [stdout] 358 | |
[INFO] [stdout] ...   |
[INFO] [stdout] 373 | |                         // }
[INFO] [stdout] 374 | |                     });
[INFO] [stdout]     | |_______________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: tasks get canceled when dropped, use `.detach()` to run them in the background
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `async_task::task::Task` that must be used
[INFO] [stdout]    --> benches/scheduler.rs:359:25
[INFO] [stdout]     |
[INFO] [stdout] 359 | /                         rt_new2.spawn(async move {
[INFO] [stdout] 360 | |                             rx1.await.unwrap();
[INFO] [stdout] 361 | |                             tx2.send(()).unwrap();
[INFO] [stdout] 362 | |                         });
[INFO] [stdout]     | |___________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: tasks get canceled when dropped, use `.detach()` to run them in the background
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 05s
[INFO] running `Command { std: "docker" "inspect" "ede31384b6bf54e006109b730862408f436380fa3ed076112004bee410fee8dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ede31384b6bf54e006109b730862408f436380fa3ed076112004bee410fee8dd", kill_on_drop: false }`
[INFO] [stdout] ede31384b6bf54e006109b730862408f436380fa3ed076112004bee410fee8dd