[INFO] fetching crate ak 0.1.1...
[INFO] checking ak-0.1.1 against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] extracting crate ak 0.1.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate ak 0.1.1 on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate ak 0.1.1
[INFO] finished tweaking crates.io crate ak 0.1.1
[INFO] tweaked toml for crates.io crate ak 0.1.1 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate ak 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ak-rt v0.1.0
[INFO] [stderr]   Downloaded ak-codegen v0.1.0
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=forbid" "-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" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 280e2b1dd2a3e9f10965e4a61d6ccdc44f0bfec6631f2ea1c3956f6fd679b35e
[INFO] running `"docker" "start" "-a" "280e2b1dd2a3e9f10965e4a61d6ccdc44f0bfec6631f2ea1c3956f6fd679b35e"`
[INFO] [stderr]    Compiling proc-macro2 v1.0.5
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]     Checking ak-rt v0.1.0
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.10
[INFO] [stderr]    Compiling ak-codegen v0.1.0
[INFO] [stderr]    Compiling async-trait v0.1.13
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-join-macro-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking tokio v0.2.0-alpha.6
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking ak v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/context.rs:59:9
[INFO] [stderr]    |
[INFO] [stderr] 59 |         tx.send(fut.await);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/context.rs:59:9
[INFO] [stderr]    |
[INFO] [stderr] 59 |         tx.send(fut.await);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] error: custom attribute panicked
[INFO] [stderr]   --> examples/basic.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     #[ak::suspend]
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: message: method : fn handle(mut self : ContextRef < Self >, msg : Payload) -> Self :: Future
[INFO] [stderr]            {
[INFO] [stderr]                async move
[INFO] [stderr]                {
[INFO] [stderr]                    if msg . 0 >= self . limit
[INFO] [stderr]                    {
[INFO] [stderr]                        println !
[INFO] [stderr]                        ("Reached limit of {} (payload was {})", self . limit, msg . 0) ;
[INFO] [stderr]                        self . stop() ; return ;
[INFO] [stderr]                    }
[INFO] [stderr]                    {
[INFO] [stderr]                        let _fut = self . next . send(Payload(msg . 0 + 1)) ;
[INFO] [stderr]                        let(mut _tmp, _res) = self . suspend(_fut) . await ; self = _tmp ;
[INFO] [stderr]                        _res
[INFO] [stderr]                    } ;
[INFO] [stderr]                }
[INFO] [stderr]            }
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::future::FutureExt`
[INFO] [stderr]  --> examples/basic.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use futures::future::FutureExt;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::future::LocalBoxFuture`
[INFO] [stderr]  --> examples/basic.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use futures::future::LocalBoxFuture;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ak::prelude::*`
[INFO] [stderr]  --> examples/basic.rs:9:16
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub(crate) use ak::prelude::*;
[INFO] [stderr]   |                ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ak::context::*`
[INFO] [stderr]   --> examples/basic.rs:11:16
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub(crate) use ak::context::*;
[INFO] [stderr]    |                ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ak::types::*`
[INFO] [stderr]   --> examples/basic.rs:12:16
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub(crate) use ak::types::*;
[INFO] [stderr]    |                ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `async_trait::async_trait`
[INFO] [stderr]   --> examples/basic.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | use async_trait::async_trait;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time::Duration`
[INFO] [stderr]   --> examples/basic.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 | use std::time::Duration;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Generator`
[INFO] [stderr]   --> examples/basic.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 | use std::ops::Generator;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::StreamExt`
[INFO] [stderr]   --> examples/basic.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | use futures::StreamExt;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::mpsc::Sender`
[INFO] [stderr]   --> examples/basic.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | use std::sync::mpsc::Sender;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: could not find defining uses
[INFO] [stderr]   --> examples/basic.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 37 |     type Future = impl Future<Output=()> + 'static;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors; 10 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `ak`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "280e2b1dd2a3e9f10965e4a61d6ccdc44f0bfec6631f2ea1c3956f6fd679b35e"`
[INFO] running `"docker" "rm" "-f" "280e2b1dd2a3e9f10965e4a61d6ccdc44f0bfec6631f2ea1c3956f6fd679b35e"`
[INFO] [stdout] 280e2b1dd2a3e9f10965e4a61d6ccdc44f0bfec6631f2ea1c3956f6fd679b35e