[INFO] crate futures-preview 0.3.0-alpha.19 is already in cache
[INFO] testing futures-preview-0.3.0-alpha.19 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate futures-preview 0.3.0-alpha.19 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate futures-preview 0.3.0-alpha.19 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate futures-preview 0.3.0-alpha.19
[INFO] finished tweaking crates.io crate futures-preview 0.3.0-alpha.19
[INFO] tweaked toml for crates.io crate futures-preview 0.3.0-alpha.19 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"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" "MAP_USER_ID=0" "-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" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stdout] f9acfb229abd2ef47680cbaea8806de754a04b76fbd7b4806257dee7199faa41
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "f9acfb229abd2ef47680cbaea8806de754a04b76fbd7b4806257dee7199faa41"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.19 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.59s
[INFO] running `"docker" "inspect" "f9acfb229abd2ef47680cbaea8806de754a04b76fbd7b4806257dee7199faa41"`
[INFO] running `"docker" "rm" "-f" "f9acfb229abd2ef47680cbaea8806de754a04b76fbd7b4806257dee7199faa41"`
[INFO] [stdout] f9acfb229abd2ef47680cbaea8806de754a04b76fbd7b4806257dee7199faa41
[INFO] running `"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" "MAP_USER_ID=0" "-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" "+beta-2020-06-03" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d1b4758f06a299881d31be816c031987b0fbd8cb2f6b56549f2da09e2f90d57b
[INFO] running `"docker" "start" "-a" "d1b4758f06a299881d31be816c031987b0fbd8cb2f6b56549f2da09e2f90d57b"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.19 (/opt/rustwide/workdir)
[INFO] [stderr] error: cannot find macro `poll` in this scope
[INFO] [stderr]   --> tests/macro_comma_support.rs:21:17
[INFO] [stderr]    |
[INFO] [stderr] 21 |         let _ = poll!(async {}.boxed(),);
[INFO] [stderr]    |                 ^^^^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find macro `join` in this scope
[INFO] [stderr]   --> tests/macro_comma_support.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |         join!(future1, future2,);
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find macro `try_join` in this scope
[INFO] [stderr]   --> tests/macro_comma_support.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |         try_join!(future1, future2,)
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `futures-preview`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0432]: unresolved import `assert_matches`
[INFO] [stderr]  --> tests/io_cursor.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use assert_matches::assert_matches;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^ use of undeclared type or module `assert_matches`
[INFO] [stderr] 
[INFO] [stderr] error: cannot determine resolution for the macro `assert_matches`
[INFO] [stderr]   --> tests/io_cursor.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |         assert_matches!(Pin::new(&mut cursor).poll_write(cx, &[1, 2]), Poll::Ready(Ok(2)));
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: import resolution is stuck, try simplifying macro imports
[INFO] [stderr] 
[INFO] [stderr] error: cannot determine resolution for the macro `assert_matches`
[INFO] [stderr]   --> tests/io_cursor.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         assert_matches!(Pin::new(&mut cursor).poll_write(cx, &[3, 4]), Poll::Ready(Ok(2)));
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: import resolution is stuck, try simplifying macro imports
[INFO] [stderr] 
[INFO] [stderr] error: cannot determine resolution for the macro `assert_matches`
[INFO] [stderr]   --> tests/io_cursor.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         assert_matches!(Pin::new(&mut cursor).poll_write(cx, &[5, 6]), Poll::Ready(Ok(1)));
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: import resolution is stuck, try simplifying macro imports
[INFO] [stderr] 
[INFO] [stderr] error: cannot determine resolution for the macro `assert_matches`
[INFO] [stderr]   --> tests/io_cursor.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |         assert_matches!(Pin::new(&mut cursor).poll_write(cx, &[6, 7]), Poll::Ready(Ok(0)));
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: import resolution is stuck, try simplifying macro imports
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::Poll`
[INFO] [stderr]  --> tests/io_cursor.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use futures::Poll;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::io::AsyncWrite`
[INFO] [stderr]  --> tests/io_cursor.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use futures::io::AsyncWrite;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::pin::Pin`
[INFO] [stderr]  --> tests/io_cursor.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::pin::Pin;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `futures_test`
[INFO] [stderr]  --> tests/io_read_to_string.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use futures_test::io::AsyncReadTestExt;
[INFO] [stderr]   |     ^^^^^^^^^^^^ use of undeclared type or module `futures_test`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `futures_test`
[INFO] [stderr]  --> tests/io_read_to_string.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use futures_test::task::noop_context;
[INFO] [stderr]   |     ^^^^^^^^^^^^ use of undeclared type or module `futures_test`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `futures_test`
[INFO] [stderr]  --> tests/mutex.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use futures_test::future::FutureTestExt;
[INFO] [stderr]   |     ^^^^^^^^^^^^ use of undeclared type or module `futures_test`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `futures_test`
[INFO] [stderr]  --> tests/mutex.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use futures_test::task::{panic_context, new_count_waker};
[INFO] [stderr]   |     ^^^^^^^^^^^^ use of undeclared type or module `futures_test`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `noop_context` in this scope
[INFO] [stderr]   --> tests/io_read_to_string.rs:28:18
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let mut cx = noop_context();
[INFO] [stderr]    |                  ^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `futures_test`
[INFO] [stderr]  --> tests/ready_queue.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use futures_test::task::noop_context;
[INFO] [stderr]   |     ^^^^^^^^^^^^ use of undeclared type or module `futures_test`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `futures_test`
[INFO] [stderr]  --> tests/futures_unordered.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use futures_test::future::FutureTestExt;
[INFO] [stderr]   |     ^^^^^^^^^^^^ use of undeclared type or module `futures_test`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `futures_test`
[INFO] [stderr]  --> tests/futures_unordered.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use futures_test::task::noop_context;
[INFO] [stderr]   |     ^^^^^^^^^^^^ use of undeclared type or module `futures_test`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors; 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error[E0425]: cannot find function `noop_context` in this scope
[INFO] [stderr]   --> tests/ready_queue.rs:83:27
[INFO] [stderr]    |
[INFO] [stderr] 83 |             let cx = &mut noop_context();
[INFO] [stderr]    |                           ^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `panic_context` in this scope
[INFO] [stderr]   --> tests/mutex.rs:14:46
[INFO] [stderr]    |
[INFO] [stderr] 14 |         assert!(mutex.lock().poll_unpin(&mut panic_context()).is_ready());
[INFO] [stderr]    |                                              ^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `new_count_waker` in this scope
[INFO] [stderr]   --> tests/mutex.rs:21:28
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let (waker, counter) = new_count_waker();
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `panic_context` in this scope
[INFO] [stderr]   --> tests/mutex.rs:22:45
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let lock = mutex.lock().poll_unpin(&mut panic_context());
[INFO] [stderr]    |                                             ^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `panic_context` in this scope
[INFO] [stderr]   --> tests/mutex.rs:33:36
[INFO] [stderr]    |
[INFO] [stderr] 33 |     assert!(waiter.poll_unpin(&mut panic_context()).is_ready());
[INFO] [stderr]    |                                    ^^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `interleave_pending` found for struct `futures_util::try_stream::into_async_read::IntoAsyncRead<futures_util::stream::map::Map<futures_util::stream::iter::Iter<std::vec::IntoIter<&[u8]>>, fn(&[u8]) -> std::result::Result<&[u8], std::io::Error> {std::result::Result::<&[u8], std::io::Error>::Ok}>>` in the current scope
[INFO] [stderr]   --> tests/io_read_to_string.rs:41:10
[INFO] [stderr]    |
[INFO] [stderr] 41 |         .interleave_pending();
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^ method not found in `futures_util::try_stream::into_async_read::IntoAsyncRead<futures_util::stream::map::Map<futures_util::stream::iter::Iter<std::vec::IntoIter<&[u8]>>, fn(&[u8]) -> std::result::Result<&[u8], std::io::Error> {std::result::Result::<&[u8], std::io::Error>::Ok}>>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0433.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error[E0432]: unresolved import `futures_test`
[INFO] [stderr]  --> tests/futures_unordered.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use futures_test::{assert_stream_done, assert_stream_next};
[INFO] [stderr]   |     ^^^^^^^^^^^^ use of undeclared type or module `futures_test`
[INFO] [stderr] 
[INFO] [stderr] error: cannot determine resolution for the macro `assert_stream_next`
[INFO] [stderr]    --> tests/futures_unordered.rs:173:5
[INFO] [stderr]     |
[INFO] [stderr] 173 |     assert_stream_next!(stream, ());
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: import resolution is stuck, try simplifying macro imports
[INFO] [stderr] 
[INFO] [stderr] error: cannot determine resolution for the macro `assert_stream_next`
[INFO] [stderr]    --> tests/futures_unordered.rs:174:5
[INFO] [stderr]     |
[INFO] [stderr] 174 |     assert_stream_next!(stream, ());
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: import resolution is stuck, try simplifying macro imports
[INFO] [stderr] 
[INFO] [stderr] error: cannot determine resolution for the macro `assert_stream_next`
[INFO] [stderr]    --> tests/futures_unordered.rs:175:5
[INFO] [stderr]     |
[INFO] [stderr] 175 |     assert_stream_next!(stream, ());
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: import resolution is stuck, try simplifying macro imports
[INFO] [stderr] 
[INFO] [stderr] error: cannot determine resolution for the macro `assert_stream_done`
[INFO] [stderr]    --> tests/futures_unordered.rs:176:5
[INFO] [stderr]     |
[INFO] [stderr] 176 |     assert_stream_done!(stream);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: import resolution is stuck, try simplifying macro imports
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `noop_context` in this scope
[INFO] [stderr]   --> tests/futures_unordered.rs:12:18
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let mut cx = noop_context();
[INFO] [stderr]    |                  ^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `noop_context` in this scope
[INFO] [stderr]   --> tests/futures_unordered.rs:75:18
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let mut cx = noop_context();
[INFO] [stderr]    |                  ^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `noop_context` in this scope
[INFO] [stderr]    --> tests/futures_unordered.rs:108:19
[INFO] [stderr]     |
[INFO] [stderr] 108 |     let cx = &mut noop_context();
[INFO] [stderr]     |                   ^^^^^^^^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0433, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error[E0599]: no method named `pending_once` found for struct `futures_util::future::ready::Ready<()>` in the current scope
[INFO] [stderr]   --> tests/mutex.rs:53:23
[INFO] [stderr]    |
[INFO] [stderr] 53 |             ready(()).pending_once().await;
[INFO] [stderr]    |                       ^^^^^^^^^^^^ method not found in `futures_util::future::ready::Ready<()>`
[INFO] [stderr] 
[INFO] [stderr] error[E0698]: type inside `async` block must be known in this context
[INFO] [stderr]   --> tests/mutex.rs:52:28
[INFO] [stderr]    |
[INFO] [stderr] 52 |             let mut lock = mutex.lock().await;
[INFO] [stderr]    |                            ^^^^^ cannot infer type for type `{integer}`
[INFO] [stderr]    |
[INFO] [stderr] note: the type is part of the `async` block because of this `await`
[INFO] [stderr]   --> tests/mutex.rs:52:28
[INFO] [stderr]    |
[INFO] [stderr] 52 |             let mut lock = mutex.lock().await;
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0698]: type inside `async` block must be known in this context
[INFO] [stderr]   --> tests/mutex.rs:52:28
[INFO] [stderr]    |
[INFO] [stderr] 52 |             let mut lock = mutex.lock().await;
[INFO] [stderr]    |                            ^^^^^^^^^^^^ cannot infer type for type `{integer}`
[INFO] [stderr]    |
[INFO] [stderr] note: the type is part of the `async` block because of this `await`
[INFO] [stderr]   --> tests/mutex.rs:52:28
[INFO] [stderr]    |
[INFO] [stderr] 52 |             let mut lock = mutex.lock().await;
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0698]: type inside `async` block must be known in this context
[INFO] [stderr]   --> tests/mutex.rs:52:28
[INFO] [stderr]    |
[INFO] [stderr] 52 |             let mut lock = mutex.lock().await;
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^^^ cannot infer type for type `{integer}`
[INFO] [stderr]    |
[INFO] [stderr] note: the type is part of the `async` block because of this `await`
[INFO] [stderr]   --> tests/mutex.rs:52:28
[INFO] [stderr]    |
[INFO] [stderr] 52 |             let mut lock = mutex.lock().await;
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0698]: type inside `async` block must be known in this context
[INFO] [stderr]   --> tests/mutex.rs:52:17
[INFO] [stderr]    |
[INFO] [stderr] 52 |             let mut lock = mutex.lock().await;
[INFO] [stderr]    |                 ^^^^^^^^ cannot infer type for type `{integer}`
[INFO] [stderr]    |
[INFO] [stderr] note: the type is part of the `async` block because of this `await`
[INFO] [stderr]   --> tests/mutex.rs:53:13
[INFO] [stderr]    |
[INFO] [stderr] 53 |             ready(()).pending_once().await;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0698]: type inside `async` block must be known in this context
[INFO] [stderr]   --> tests/mutex.rs:61:18
[INFO] [stderr]    |
[INFO] [stderr] 61 |         for _ in 0..num_tasks {
[INFO] [stderr]    |                  ^ cannot infer type for type `{integer}`
[INFO] [stderr]    |
[INFO] [stderr] note: the type is part of the `async` block because of this `await`
[INFO] [stderr]   --> tests/mutex.rs:62:22
[INFO] [stderr]    |
[INFO] [stderr] 62 |             let () = rx.next().await.unwrap();
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0698]: type inside `async` block must be known in this context
[INFO] [stderr]   --> tests/mutex.rs:61:21
[INFO] [stderr]    |
[INFO] [stderr] 61 |         for _ in 0..num_tasks {
[INFO] [stderr]    |                     ^^^^^^^^^ cannot infer type for type `{integer}`
[INFO] [stderr]    |
[INFO] [stderr] note: the type is part of the `async` block because of this `await`
[INFO] [stderr]   --> tests/mutex.rs:62:22
[INFO] [stderr]    |
[INFO] [stderr] 62 |             let () = rx.next().await.unwrap();
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0698]: type inside `async` block must be known in this context
[INFO] [stderr]   --> tests/mutex.rs:61:18
[INFO] [stderr]    |
[INFO] [stderr] 61 |         for _ in 0..num_tasks {
[INFO] [stderr]    |                  ^^^^^^^^^^^^ cannot infer type for type `{integer}`
[INFO] [stderr]    |
[INFO] [stderr] note: the type is part of the `async` block because of this `await`
[INFO] [stderr]   --> tests/mutex.rs:62:22
[INFO] [stderr]    |
[INFO] [stderr] 62 |             let () = rx.next().await.unwrap();
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0698]: type inside `async` block must be known in this context
[INFO] [stderr]   --> tests/mutex.rs:64:20
[INFO] [stderr]    |
[INFO] [stderr] 64 |         let lock = mutex.lock().await;
[INFO] [stderr]    |                    ^^^^^ cannot infer type for type `{integer}`
[INFO] [stderr]    |
[INFO] [stderr] note: the type is part of the `async` block because of this `await`
[INFO] [stderr]   --> tests/mutex.rs:64:20
[INFO] [stderr]    |
[INFO] [stderr] 64 |         let lock = mutex.lock().await;
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0698]: type inside `async` block must be known in this context
[INFO] [stderr]   --> tests/mutex.rs:64:20
[INFO] [stderr]    |
[INFO] [stderr] 64 |         let lock = mutex.lock().await;
[INFO] [stderr]    |                    ^^^^^^^^^^^^ cannot infer type for type `{integer}`
[INFO] [stderr]    |
[INFO] [stderr] note: the type is part of the `async` block because of this `await`
[INFO] [stderr]   --> tests/mutex.rs:64:20
[INFO] [stderr]    |
[INFO] [stderr] 64 |         let lock = mutex.lock().await;
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0698]: type inside `async` block must be known in this context
[INFO] [stderr]   --> tests/mutex.rs:64:20
[INFO] [stderr]    |
[INFO] [stderr] 64 |         let lock = mutex.lock().await;
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^ cannot infer type for type `{integer}`
[INFO] [stderr]    |
[INFO] [stderr] note: the type is part of the `async` block because of this `await`
[INFO] [stderr]   --> tests/mutex.rs:64:20
[INFO] [stderr]    |
[INFO] [stderr] 64 |         let lock = mutex.lock().await;
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 17 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0433, E0599, E0698.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error[E0599]: no method named `pending_once` found for struct `futures_util::future::ready::Ready<()>` in the current scope
[INFO] [stderr]    --> tests/futures_unordered.rs:171:33
[INFO] [stderr]     |
[INFO] [stderr] 171 |     let fut = future::ready(()).pending_once().assert_unmoved();
[INFO] [stderr]     |                                 ^^^^^^^^^^^^ method not found in `futures_util::future::ready::Ready<()>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 11 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0432, E0433, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "d1b4758f06a299881d31be816c031987b0fbd8cb2f6b56549f2da09e2f90d57b"`
[INFO] running `"docker" "rm" "-f" "d1b4758f06a299881d31be816c031987b0fbd8cb2f6b56549f2da09e2f90d57b"`
[INFO] [stdout] d1b4758f06a299881d31be816c031987b0fbd8cb2f6b56549f2da09e2f90d57b