[INFO] cloning repository andysalerno/rust_async_example
[INFO] running `"git" "clone" "--bare" "git://github.com/andysalerno/rust_async_example.git" "work/cache/sources/gh/andysalerno/rust_async_example"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/andysalerno/rust_async_example'...
[INFO] running `"git" "clone" "work/cache/sources/gh/andysalerno/rust_async_example" "work/ex/beta-1.37-6/sources/1.36.0/gh/andysalerno/rust_async_example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/andysalerno/rust_async_example'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/andysalerno/rust_async_example" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/andysalerno/rust_async_example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/andysalerno/rust_async_example'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8ccf54bf7b42f342156c58c0746eba86d8ce15fc
[INFO] sha for GitHub repo andysalerno/rust_async_example: 8ccf54bf7b42f342156c58c0746eba86d8ce15fc
[INFO] validating manifest of andysalerno/rust_async_example on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of andysalerno/rust_async_example on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing andysalerno/rust_async_example
[INFO] finished frobbing andysalerno/rust_async_example
[INFO] frobbed toml for andysalerno/rust_async_example written to work/ex/beta-1.37-6/sources/1.36.0/gh/andysalerno/rust_async_example/Cargo.toml
[INFO] started frobbing andysalerno/rust_async_example
[INFO] finished frobbing andysalerno/rust_async_example
[INFO] frobbed toml for andysalerno/rust_async_example written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/andysalerno/rust_async_example/Cargo.toml
[INFO] crate andysalerno/rust_async_example already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing andysalerno/rust_async_example against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/andysalerno/rust_async_example:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] dc533bc43c7057b94bff13560f1f7635de97c69aaebd7e756aad845fc1673819
[INFO] running `"docker" "start" "-a" "dc533bc43c7057b94bff13560f1f7635de97c69aaebd7e756aad845fc1673819"`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling log v0.4.7
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling syn v0.15.40
[INFO] [stderr]    Compiling async-ready v3.0.0
[INFO] [stderr]    Compiling async-datagram v3.0.0
[INFO] [stderr]    Compiling async-datagram v2.2.0
[INFO] [stderr]    Compiling rand_chacha v0.2.0
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/async-datagram-2.2.0/src/lib.rs:43:1
[INFO] [stderr]    |
[INFO] [stderr] 43 | #![feature(futures_api)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `async-datagram`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "dc533bc43c7057b94bff13560f1f7635de97c69aaebd7e756aad845fc1673819"`
[INFO] running `"docker" "rm" "-f" "dc533bc43c7057b94bff13560f1f7635de97c69aaebd7e756aad845fc1673819"`
[INFO] [stdout] dc533bc43c7057b94bff13560f1f7635de97c69aaebd7e756aad845fc1673819