[INFO] fetching crate executors 0.8.0...
[INFO] checking executors-0.8.0 against beta for pr-78714
[INFO] extracting crate executors 0.8.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate executors 0.8.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "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-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ccac88486b65c23327494c527cd830ca54d2412589bf3a5cb03a81fef33d5535
[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" "ccac88486b65c23327494c527cd830ca54d2412589bf3a5cb03a81fef33d5535", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ccac88486b65c23327494c527cd830ca54d2412589bf3a5cb03a81fef33d5535", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ccac88486b65c23327494c527cd830ca54d2412589bf3a5cb03a81fef33d5535", kill_on_drop: false }`
[INFO] [stdout] ccac88486b65c23327494c527cd830ca54d2412589bf3a5cb03a81fef33d5535
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cfc55a36f9b5cb41f0ec8d558a4c5521a1d44320f249d616074623c367f3ea36
[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" "cfc55a36f9b5cb41f0ec8d558a4c5521a1d44320f249d616074623c367f3ea36", kill_on_drop: false }`
[INFO] [stderr]    Compiling pulldown-cmark v0.7.2
[INFO] [stderr]     Checking semver-parser v0.9.0
[INFO] [stderr]     Checking async-task v4.0.3
[INFO] [stderr]     Checking proc-macro2 v1.0.24
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking toml v0.5.7
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking synchronoise v1.0.0
[INFO] [stderr]     Checking quote v1.0.7
[INFO] [stderr]     Checking version-sync v0.9.1
[INFO] [stderr]    Compiling pin-project-internal v1.0.1
[INFO] [stderr]    Compiling futures-macro v0.3.8
[INFO] [stderr]    Compiling arr_macro_impl v0.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]     Checking arr_macro v0.1.3
[INFO] [stderr]     Checking executors v0.8.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking pin-project v1.0.1
[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 44.68s
[INFO] running `Command { std: "docker" "inspect" "cfc55a36f9b5cb41f0ec8d558a4c5521a1d44320f249d616074623c367f3ea36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cfc55a36f9b5cb41f0ec8d558a4c5521a1d44320f249d616074623c367f3ea36", kill_on_drop: false }`
[INFO] [stdout] cfc55a36f9b5cb41f0ec8d558a4c5521a1d44320f249d616074623c367f3ea36