[INFO] crate riker 0.3.2 is already in cache
[INFO] testing riker-0.3.2 against 1.38.0 for beta-1.39-1
[INFO] extracting crate riker 0.3.2 into work/builds/worker-5/source
[INFO] validating manifest of crates.io crate riker 0.3.2 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 crates.io crate riker 0.3.2
[INFO] finished tweaking crates.io crate riker 0.3.2
[INFO] tweaked toml for crates.io crate riker 0.3.2 written to work/builds/worker-5/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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-5/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-5/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] 0cc062cd35cea3e22839464dbeb0a731b4659364bf99beb988ae556eff2c4e7a
[INFO] running `"docker" "start" "-a" "0cc062cd35cea3e22839464dbeb0a731b4659364bf99beb988ae556eff2c4e7a"`
[INFO] [stderr]    Compiling riker-macros v0.1.0
[INFO] [stderr]    Compiling riker v0.3.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0658]: async blocks are unstable
[INFO] [stderr]   --> src/kernel/kernel.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |       let f = async move {
[INFO] [stderr]    |  _____________^
[INFO] [stderr] 61 | |         while let Some(msg) = rx.next().await {
[INFO] [stderr] 62 | |             match msg {
[INFO] [stderr] 63 | |                 KernelMsg::RunActor => {
[INFO] [stderr] ...  |
[INFO] [stderr] 86 | |         }
[INFO] [stderr] 87 | |     };
[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]   --> src/kernel/kernel.rs:61:31
[INFO] [stderr]    |
[INFO] [stderr] 61 |         while let Some(msg) = rx.next().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 blocks are unstable
[INFO] [stderr]   --> src/kernel/kernel_ref.rs:40:20
[INFO] [stderr]    |
[INFO] [stderr] 40 |           exec.spawn(async move {
[INFO] [stderr]    |  ____________________^
[INFO] [stderr] 41 | |             drop(tx.send(msg).await);
[INFO] [stderr] 42 | |         })
[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]   --> src/kernel/kernel_ref.rs:41:18
[INFO] [stderr]    |
[INFO] [stderr] 41 |             drop(tx.send(msg).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: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: Could not compile `riker`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "0cc062cd35cea3e22839464dbeb0a731b4659364bf99beb988ae556eff2c4e7a"`
[INFO] running `"docker" "rm" "-f" "0cc062cd35cea3e22839464dbeb0a731b4659364bf99beb988ae556eff2c4e7a"`
[INFO] [stdout] 0cc062cd35cea3e22839464dbeb0a731b4659364bf99beb988ae556eff2c4e7a