[INFO] updating cached repository https://github.com/dekellum/blocking-permit
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/dekellum/blocking-permit
[INFO] [stderr]    40f2021..9cd35e4  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9cd35e4789b271f883aad2d4b12ab57dc2ae0dc0
[INFO] testing dekellum/blocking-permit against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdekellum%2Fblocking-permit" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dekellum/blocking-permit on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/dekellum/blocking-permit
[INFO] finished tweaking git repo https://github.com/dekellum/blocking-permit
[INFO] tweaked toml for git repo https://github.com/dekellum/blocking-permit written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/dekellum/blocking-permit already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] d0b6ca9dd08e98459b8f982588c4ee080b64ec96b5187e79dea43f3bc5a1fff4
[INFO] running `"docker" "start" "-a" "d0b6ca9dd08e98459b8f982588c4ee080b64ec96b5187e79dea43f3bc5a1fff4"`
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling crossbeam-deque v0.7.1
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling tokio-sync v0.2.0-alpha.6
[INFO] [stderr] error[E0658]: async fn is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/barrier.rs:80:5
[INFO] [stderr]     |
[INFO] [stderr] 80  | /     pub async fn wait(&self) -> BarrierWaitResult {
[INFO] [stderr] 81  | |         // NOTE: we are taking a _synchronous_ lock here.
[INFO] [stderr] 82  | |         // It is okay to do so because the critical section is fast and never yields, so it cannot
[INFO] [stderr] 83  | |         // deadlock even if another future is concurrently holding the lock.
[INFO] [stderr] ...   |
[INFO] [stderr] 118 | |         BarrierWaitResult(false)
[INFO] [stderr] 119 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async/await is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/barrier.rs:113:16
[INFO] [stderr]     |
[INFO] [stderr] 113 |             if wait.recv().await.expect("sender hasn't been closed") >= generation {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async fn is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/mpsc/bounded.rs:164:5
[INFO] [stderr]     |
[INFO] [stderr] 164 | /     pub async fn recv(&mut self) -> Option<T> {
[INFO] [stderr] 165 | |         use futures_util::future::poll_fn;
[INFO] [stderr] 166 | |
[INFO] [stderr] 167 | |         poll_fn(|cx| self.poll_recv(cx)).await
[INFO] [stderr] 168 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async/await is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/mpsc/bounded.rs:167:9
[INFO] [stderr]     |
[INFO] [stderr] 167 |         poll_fn(|cx| self.poll_recv(cx)).await
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async fn is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/mpsc/bounded.rs:238:5
[INFO] [stderr]     |
[INFO] [stderr] 238 | /     pub async fn send(&mut self, value: T) -> Result<(), SendError> {
[INFO] [stderr] 239 | |         use futures_util::future::poll_fn;
[INFO] [stderr] 240 | |
[INFO] [stderr] 241 | |         poll_fn(|cx| self.poll_ready(cx)).await?;
[INFO] [stderr] 242 | |
[INFO] [stderr] 243 | |         self.try_send(value).map_err(|_| SendError(()))
[INFO] [stderr] 244 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async/await is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/mpsc/bounded.rs:241:9
[INFO] [stderr]     |
[INFO] [stderr] 241 |         poll_fn(|cx| self.poll_ready(cx)).await?;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async fn is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/mpsc/unbounded.rs:134:5
[INFO] [stderr]     |
[INFO] [stderr] 134 | /     pub async fn recv(&mut self) -> Option<T> {
[INFO] [stderr] 135 | |         use futures_util::future::poll_fn;
[INFO] [stderr] 136 | |
[INFO] [stderr] 137 | |         poll_fn(|cx| self.poll_recv(cx)).await
[INFO] [stderr] 138 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async/await is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/mpsc/unbounded.rs:137:9
[INFO] [stderr]     |
[INFO] [stderr] 137 |         poll_fn(|cx| self.poll_recv(cx)).await
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async fn is unstable
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/mutex.rs:87:5
[INFO] [stderr]    |
[INFO] [stderr] 87 | /     pub async fn lock(&self) -> MutexGuard<'_, T> {
[INFO] [stderr] 88 | |         let mut permit = semaphore::Permit::new();
[INFO] [stderr] 89 | |         poll_fn(|cx| permit.poll_acquire(cx, &self.s))
[INFO] [stderr] 90 | |             .await
[INFO] [stderr] ...  |
[INFO] [stderr] 97 | |         MutexGuard { lock: self, permit }
[INFO] [stderr] 98 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async/await is unstable
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/mutex.rs:89:9
[INFO] [stderr]    |
[INFO] [stderr] 89 | /         poll_fn(|cx| permit.poll_acquire(cx, &self.s))
[INFO] [stderr] 90 | |             .await
[INFO] [stderr]    | |__________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async fn is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/oneshot.rs:223:5
[INFO] [stderr]     |
[INFO] [stderr] 223 | /     pub async fn closed(&mut self) {
[INFO] [stderr] 224 | |         use futures_util::future::poll_fn;
[INFO] [stderr] 225 | |
[INFO] [stderr] 226 | |         poll_fn(|cx| self.poll_closed(cx)).await
[INFO] [stderr] 227 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async/await is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/oneshot.rs:226:9
[INFO] [stderr]     |
[INFO] [stderr] 226 |         poll_fn(|cx| self.poll_closed(cx)).await
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async fn is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/watch.rs:248:5
[INFO] [stderr]     |
[INFO] [stderr] 248 | /     pub async fn recv_ref(&mut self) -> Option<Ref<'_, T>> {
[INFO] [stderr] 249 | |         let shared = &self.shared;
[INFO] [stderr] 250 | |         let inner = &self.inner;
[INFO] [stderr] 251 | |         let version = self.ver;
[INFO] [stderr] ...   |
[INFO] [stderr] 259 | |         }
[INFO] [stderr] 260 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async/await is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/watch.rs:253:15
[INFO] [stderr]     |
[INFO] [stderr] 253 |         match poll_fn(|cx| poll_lock(cx, shared, inner, version)).await {
[INFO] [stderr]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async fn is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/watch.rs:295:5
[INFO] [stderr]     |
[INFO] [stderr] 295 | /     pub async fn recv(&mut self) -> Option<T> {
[INFO] [stderr] 296 | |         self.recv_ref().await.map(|v_ref| v_ref.clone())
[INFO] [stderr] 297 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async/await is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/watch.rs:296:9
[INFO] [stderr]     |
[INFO] [stderr] 296 |         self.recv_ref().await.map(|v_ref| v_ref.clone())
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async fn is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/watch.rs:386:5
[INFO] [stderr]     |
[INFO] [stderr] 386 | /     pub async fn closed(&mut self) {
[INFO] [stderr] 387 | |         poll_fn(|cx| self.poll_close(cx)).await
[INFO] [stderr] 388 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async/await is unstable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.6/src/watch.rs:387:9
[INFO] [stderr]     |
[INFO] [stderr] 387 |         poll_fn(|cx| self.poll_close(cx)).await
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.19
[INFO] [stderr] error: aborting due to 18 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: Could not compile `tokio-sync`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "d0b6ca9dd08e98459b8f982588c4ee080b64ec96b5187e79dea43f3bc5a1fff4"`
[INFO] running `"docker" "rm" "-f" "d0b6ca9dd08e98459b8f982588c4ee080b64ec96b5187e79dea43f3bc5a1fff4"`
[INFO] [stdout] d0b6ca9dd08e98459b8f982588c4ee080b64ec96b5187e79dea43f3bc5a1fff4