[INFO] fetching crate aktoro-channel 0.1.0-alpha.8...
[INFO] testing aktoro-channel-0.1.0-alpha.8 against master#62efba8a050c64249dab942951bb28f710208bc8 for pr-90799
[INFO] extracting crate aktoro-channel 0.1.0-alpha.8 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate aktoro-channel 0.1.0-alpha.8 on toolchain 62efba8a050c64249dab942951bb28f710208bc8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate aktoro-channel 0.1.0-alpha.8
[INFO] finished tweaking crates.io crate aktoro-channel 0.1.0-alpha.8
[INFO] tweaked toml for crates.io crate aktoro-channel 0.1.0-alpha.8 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4d0118855f85a5b01f2dcd7473ce2d1feb254b616815ba6042770a1ba248b415
[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" "4d0118855f85a5b01f2dcd7473ce2d1feb254b616815ba6042770a1ba248b415", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4d0118855f85a5b01f2dcd7473ce2d1feb254b616815ba6042770a1ba248b415", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d0118855f85a5b01f2dcd7473ce2d1feb254b616815ba6042770a1ba248b415", kill_on_drop: false }`
[INFO] [stdout] 4d0118855f85a5b01f2dcd7473ce2d1feb254b616815ba6042770a1ba248b415
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "build" "--frozen" "--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] a4e2837fb99b519045672a0c4da69402f4a299487fb18a4952f1c64959724885
[INFO] running `Command { std: "docker" "start" "-a" "a4e2837fb99b519045672a0c4da69402f4a299487fb18a4952f1c64959724885", kill_on_drop: false }`
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling aktoro-channel v0.1.0-alpha.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]   --> src/counters.rs:72:28
[INFO] [stdout]    |
[INFO] [stdout] 72 |                 if counter.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]   --> src/counters.rs:99:34
[INFO] [stdout]    |
[INFO] [stdout] 99 |                 if self.csenders.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/counters.rs:128:34
[INFO] [stdout]     |
[INFO] [stdout] 128 |                 if self.crecvers.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/counters.rs:147:18
[INFO] [stdout]     |
[INFO] [stdout] 147 |                 .compare_and_swap(cur, cur - 1, Ordering::SeqCst)
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/counters.rs:163:18
[INFO] [stdout]     |
[INFO] [stdout] 163 |                 .compare_and_swap(cur, cur - 1, Ordering::SeqCst)
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `Command { std: "docker" "inspect" "a4e2837fb99b519045672a0c4da69402f4a299487fb18a4952f1c64959724885", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4e2837fb99b519045672a0c4da69402f4a299487fb18a4952f1c64959724885", kill_on_drop: false }`
[INFO] [stdout] a4e2837fb99b519045672a0c4da69402f4a299487fb18a4952f1c64959724885
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "test" "--frozen" "--no-run" "--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] ee08c76f5bb9c2c52723c64e26a6b7583f9a727c38e602326213c5f3fea550be
[INFO] running `Command { std: "docker" "start" "-a" "ee08c76f5bb9c2c52723c64e26a6b7583f9a727c38e602326213c5f3fea550be", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling slab v0.4.5
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling async-datagram v3.0.0
[INFO] [stderr]    Compiling async-ready v3.0.0
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling lock_api v0.3.4
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]   --> src/counters.rs:72:28
[INFO] [stdout]    |
[INFO] [stdout] 72 |                 if counter.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]   --> src/counters.rs:99:34
[INFO] [stdout]    |
[INFO] [stdout] 99 |                 if self.csenders.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/counters.rs:128:34
[INFO] [stdout]     |
[INFO] [stdout] 128 |                 if self.crecvers.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/counters.rs:147:18
[INFO] [stdout]     |
[INFO] [stdout] 147 |                 .compare_and_swap(cur, cur - 1, Ordering::SeqCst)
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/counters.rs:163:18
[INFO] [stdout]     |
[INFO] [stdout] 163 |                 .compare_and_swap(cur, cur - 1, Ordering::SeqCst)
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling crossbeam-queue v0.2.3
[INFO] [stderr]    Compiling crossbeam-channel v0.4.4
[INFO] [stderr]    Compiling crossbeam-deque v0.7.4
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling net2 v0.2.37
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling crossbeam v0.7.3
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling runtime-raw v0.3.0-alpha.5
[INFO] [stderr]    Compiling juliex v0.3.0-alpha.8
[INFO] [stderr]    Compiling futures-timer v0.3.0
[INFO] [stderr]    Compiling romio v0.3.0-alpha.10
[INFO] [stderr]    Compiling runtime-native v0.3.0-alpha.6
[INFO] [stderr]    Compiling runtime-attributes v0.3.0-alpha.6
[INFO] [stderr]    Compiling runtime v0.3.0-alpha.7
[INFO] [stderr]    Compiling aktoro-channel v0.1.0-alpha.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]   --> src/counters.rs:72:28
[INFO] [stdout]    |
[INFO] [stdout] 72 |                 if counter.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]   --> src/counters.rs:99:34
[INFO] [stdout]    |
[INFO] [stdout] 99 |                 if self.csenders.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/counters.rs:128:34
[INFO] [stdout]     |
[INFO] [stdout] 128 |                 if self.crecvers.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/counters.rs:147:18
[INFO] [stdout]     |
[INFO] [stdout] 147 |                 .compare_and_swap(cur, cur - 1, Ordering::SeqCst)
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/counters.rs:163:18
[INFO] [stdout]     |
[INFO] [stdout] 163 |                 .compare_and_swap(cur, cur - 1, Ordering::SeqCst)
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 9.50s
[INFO] running `Command { std: "docker" "inspect" "ee08c76f5bb9c2c52723c64e26a6b7583f9a727c38e602326213c5f3fea550be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee08c76f5bb9c2c52723c64e26a6b7583f9a727c38e602326213c5f3fea550be", kill_on_drop: false }`
[INFO] [stdout] ee08c76f5bb9c2c52723c64e26a6b7583f9a727c38e602326213c5f3fea550be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3955d9de7138f8553c01ff8dcb77a8cf116586ae96481470b40e6203e84b7117
[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" "3955d9de7138f8553c01ff8dcb77a8cf116586ae96481470b40e6203e84b7117", kill_on_drop: false }`
[INFO] [stderr] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stderr]   --> src/counters.rs:72:28
[INFO] [stderr]    |
[INFO] [stderr] 72 |                 if counter.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stderr]   --> src/counters.rs:99:34
[INFO] [stderr]    |
[INFO] [stderr] 99 |                 if self.csenders.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stderr]    --> src/counters.rs:128:34
[INFO] [stderr]     |
[INFO] [stderr] 128 |                 if self.crecvers.compare_and_swap(cur, new, Ordering::SeqCst) == cur {
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stderr]    --> src/counters.rs:147:18
[INFO] [stderr]     |
[INFO] [stderr] 147 |                 .compare_and_swap(cur, cur - 1, Ordering::SeqCst)
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::sync::atomic::AtomicUsize::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stderr]    --> src/counters.rs:163:18
[INFO] [stderr]     |
[INFO] [stderr] 163 |                 .compare_and_swap(cur, cur - 1, Ordering::SeqCst)
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `aktoro-channel` (lib) generated 5 warnings
[INFO] [stderr] warning: `aktoro-channel` (lib test) generated 5 warnings (5 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/aktoro_channel-811feb6b5c3479ed)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests aktoro-channel
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "3955d9de7138f8553c01ff8dcb77a8cf116586ae96481470b40e6203e84b7117", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3955d9de7138f8553c01ff8dcb77a8cf116586ae96481470b40e6203e84b7117", kill_on_drop: false }`
[INFO] [stdout] 3955d9de7138f8553c01ff8dcb77a8cf116586ae96481470b40e6203e84b7117